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<h3>
David Eichmann pushed to branch wip/ghc-debug
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e4272101efb4139f294e404a72ec8aa8bf2e005">9e427210</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2020-09-23T11:52:10+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replace uint with unsigned int. Needed for validate-x86_64-darwin build.
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</li>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cde7ebbd3f7d10c0326c968908f7ad04ecf777ee">cde7ebbd</a></strong>
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<span>by David Eichmann</span>
<i>at 2020-09-23T11:59:33+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix warnings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7198d60e51aa64a409f823cb9ba45fcd06b5ff4a">7198d60e</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2020-09-23T17:16:25+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Error instead of deadlock when calling rts_lock after rts_pause
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fcd2bb45fa2cbd1de83a7d233d87d0655b4cca7d">fcd2bb45</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2020-09-23T18:00:15+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move and rewrite NOTE on RtsAPI thread safety
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<h4>13 changed files:</h4>
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<li class="file-stats">
<a href="#f7bfc5e15e7497f29b41f6df46865c151a07955d">
includes/RtsAPI.h
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<li class="file-stats">
<a href="#52cbed6d5a31a2e77e689138af4477c2a62f413b">
rts/RtsAPI.c
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<li class="file-stats">
<a href="#5e0aa85192ed270adfa6987ca212750750dc9a49">
testsuite/tests/rts/ghc-debug/all.T
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<li class="file-stats">
<a href="#911c330969f2084eb95592eef1f55f7befec476a">
testsuite/tests/rts/ghc-debug/shouldfail/all.T
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<a href="#53c1ad3992fd7c62ec72c68c0f8d86b573816db2">
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testsuite/tests/rts/ghc-debug/shouldfail/deadlock.c
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testsuite/tests/rts/ghc-debug/shouldfail/deadlock.h
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testsuite/tests/rts/ghc-debug/shouldfail/rts_lock_when_paused_deadlock.hs
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testsuite/tests/rts/ghc-debug/shouldfail/rts_lock_when_paused_deadlock.stderr
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<a href="#67de29af0ead130cee81589ec58de16ea127cf19">
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testsuite/tests/rts/ghc-debug/shouldfail/rts_lock_when_paused_deadlock.stdout
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testsuite/tests/rts/ghc-debug/shouldfail/rts_pause_when_locked_deadlock.hs
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testsuite/tests/rts/ghc-debug/shouldfail/rts_pause_when_locked_deadlock.stderr
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testsuite/tests/rts/ghc-debug/shouldfail/rts_pause_when_locked_deadlock.stdout
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<li class="file-stats">
<a href="#b3645895796b21dc72ea31c191b1488827d3b0ae">
testsuite/tests/rts/ghc-debug/shouldfail/unsafe_rts_pause.hs
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<h4>Changes:</h4>
<li id="f7bfc5e15e7497f29b41f6df46865c151a07955d">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/daddf2b184bc79fd51823aae83a790acf76020d5...fcd2bb45fa2cbd1de83a7d233d87d0655b4cca7d#f7bfc5e15e7497f29b41f6df46865c151a07955d"><strong>includes/RtsAPI.h</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="487" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="487" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -487,13 +487,13 @@ void rts_checkSchedStatus (char* site, Capability *);</td>
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487
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487
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<pre style="margin: 0;"> <span id="LC487" class="line" lang="c"><span class="n" style="color: #333;">SchedulerStatus</span> <span class="n" style="color: #333;">rts_getSchedStatus</span> <span class="p">(</span><span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">cap</span><span class="p">);</span></span>
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488
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488
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<pre style="margin: 0;"> <span id="LC488" class="line" lang="c"></span>
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<td class="diff-line-num old_line" data-linenumber="489" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
489
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<td class="diff-line-num new_line" data-linenumber="489" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
489
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<pre style="margin: 0;"> <span id="LC489" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Halt execution of all Haskell threads by acquiring all capabilities (safe FFI</span></span>
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<td class="diff-line-num old old_line" data-linenumber="490" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
490
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<td class="diff-line-num new_line old" data-linenumber="490" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC490" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// calls may continue). rts_resume<span class="idiff left right">()</span> must later be called on the same thread to</span></span>
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<td class="diff-line-num new old_line" data-linenumber="491" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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490
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<pre style="margin: 0;">+<span id="LC490" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// calls may continue). rts_resume must later be called on the same thread to</span></span>
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<td class="diff-line-num old_line" data-linenumber="491" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
491
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491
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// resume the RTS. Only one thread at a time can keep the rts paused. The</span></span>
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<td class="diff-line-num old_line" data-linenumber="492" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
492
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<td class="diff-line-num new_line" data-linenumber="492" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
492
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// rts_pause function will block until the current thread is given exclusive</span></span>
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<td class="diff-line-num old old_line" data-linenumber="493" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
493
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<pre style="margin: 0;">-<span id="LC493" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// permission to pause the RTS. If the RTS <span class="idiff left right">wa</span>s already paused by the current OS</span></span>
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<td class="diff-line-num new old_line" data-linenumber="494" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// permission to pause the RTS. If the RTS <span class="idiff left right">i</span>s already paused by the current OS</span></span>
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494
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<pre style="margin: 0;"> <span id="LC494" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// thread, then rts_pause will return immediately and have no effect. Returns a</span></span>
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<td class="diff-line-num old_line" data-linenumber="495" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
495
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<pre style="margin: 0;"> <span id="LC495" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// token which may be used to create new objects and evaluate them (like</span></span>
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496
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<pre style="margin: 0;">-<span id="LC496" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// rts_lock) .This is different to rts_lock<span class="idiff left right">()</span> which only pauses a single</span></span>
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<pre style="margin: 0;">+<span id="LC496" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// rts_lock) .This is different to rts_lock which only pauses a single</span></span>
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497
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// capability. Calling rts_pause in between rts_lock/rts_unlock will cause a</span></span>
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<td class="diff-line-num old_line" data-linenumber="498" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
498
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498
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// deadlock.</span></span>
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499
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="c"><span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">rts_pause</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">);</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/daddf2b184bc79fd51823aae83a790acf76020d5...fcd2bb45fa2cbd1de83a7d233d87d0655b4cca7d#52cbed6d5a31a2e77e689138af4477c2a62f413b"><strong>rts/RtsAPI.c</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -578,6 +578,12 @@ rts_getSchedStatus (Capability *cap)</td>
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">running_task</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">incall</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">rstat</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC581" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(THREADED_RTS)</span></span>
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<pre style="margin: 0;">+<span id="LC582" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// The task that paused the RTS. The rts_pausing_task variable is owned by the</span></span>
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// task that owns all capabilities (there is at most one such task).</span></span>
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<pre style="margin: 0;">+<span id="LC584" class="line" lang="c"><span class="n" style="color: #333;">Task</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">rts_pausing_task</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;"> <span id="LC587" class="line" lang="c"><span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span></span>
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<pre style="margin: 0;"> <span id="LC588" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">rts_lock</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC589" class="line" lang="c"><span class="p">{</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -594,6 +600,14 @@ rts_lock (void)</td>
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<pre style="margin: 0;"> <span id="LC600" class="line" lang="c"> <span class="n" style="color: #333;">stg_exit</span><span class="p">(</span><span class="n" style="color: #333;">EXIT_FAILURE</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC601" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC603" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(THREADED_RTS)</span></span>
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">rts_pausing_task</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">task</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="c"> <span class="n" style="color: #333;">errorBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"error: rts_lock: The RTS is already paused by this thread.</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span></span>
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="c"> <span class="s" style="color: #d14;">" There is no need to call rts_lock if you have already call rts_pause."</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="c"> <span class="n" style="color: #333;">stg_exit</span><span class="p">(</span><span class="n" style="color: #333;">EXIT_FAILURE</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC608" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC609" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="c"> <span class="n" style="color: #333;">cap</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC612" class="line" lang="c"> <span class="n" style="color: #333;">waitForCapability</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="n" style="color: #333;">task</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC613" class="line" lang="c"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -647,9 +661,37 @@ rts_unlock (Capability *cap)</td>
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<pre style="margin: 0;"> <span id="LC661" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC662" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC663" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(THREADED_RTS)</span></span>
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<pre style="margin: 0;">-<span id="LC650" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// The task that paused the RTS. The rts_pausing_task variable is owned by the</span></span>
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<pre style="margin: 0;">-<span id="LC651" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// task that owns all capabilities (there is at most one such task).</span></span>
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<pre style="margin: 0;">-<span id="LC652" class="line" lang="c"><span class="n" style="color: #333;">Task</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">rts_pausing_task</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC665" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/*</span></span>
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<pre style="margin: 0;">+<span id="LC666" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * NOTE RtsAPI thread safety:</span></span>
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<pre style="margin: 0;">+<span id="LC667" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC668" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Although it's likely sufficient for many use cases to call RtsAPI.h functions</span></span>
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<pre style="margin: 0;">+<span id="LC669" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * from a single thread, we still want to ensure that the API is thread safe.</span></span>
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<pre style="margin: 0;">+<span id="LC670" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This is achieved almost entirely by the mechanism of acquiring and releasing</span></span>
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<pre style="margin: 0;">+<span id="LC671" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Capabilities, resulting in a sort of mutex / critical section pattern.</span></span>
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<pre style="margin: 0;">+<span id="LC672" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Correct usage of this API requires that you surround API calls in</span></span>
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<pre style="margin: 0;">+<span id="LC673" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * rts_lock/rts_unlock or rts_pause/rts_resume. These ensure that the thread</span></span>
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<pre style="margin: 0;">+<span id="LC674" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * owns a capability while calling other RtsAPI functions (in the case of</span></span>
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<pre style="margin: 0;">+<span id="LC675" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * rts_pause/rts_resume the thread owns *all* capabilities).</span></span>
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<pre style="margin: 0;">+<span id="LC676" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC677" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * With the capability(s) acquired GC cannot run. That allows access to the heap</span></span>
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<pre style="margin: 0;">+<span id="LC678" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * without objects unexpectedly moving, which is important for many of the</span></span>
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<pre style="margin: 0;">+<span id="LC679" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * functions in RtsAPI.</span></span>
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC681" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Another important consequence is:</span></span>
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC683" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * * There are at most `n_capabilities` threads currently in a</span></span>
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * rts_lock/rts_unlock section.</span></span>
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<pre style="margin: 0;">+<span id="LC685" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * * There is at most 1 threads in a rts_pause/rts_resume section. In that case</span></span>
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<pre style="margin: 0;">+<span id="LC686" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * there will be no threads in a rts_lock/rts_unlock section.</span></span>
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<pre style="margin: 0;">+<span id="LC687" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * * rts_pause and rts_lock may block in order to enforce the above 2</span></span>
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<pre style="margin: 0;">+<span id="LC688" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * invariants.</span></span>
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<pre style="margin: 0;">+<span id="LC689" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * In particular, by ensuring that that code does not block indefinitely in a</span></span>
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * rts_lock/rts_unlock or rts_pause/rts_resume section, we can be confident that</span></span>
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * the RtsAPI functions will not cause a deadlock even when many threads are</span></span>
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<pre style="margin: 0;">+<span id="LC693" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * attempting to use the RtsAPI concurrently.</span></span>
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<pre style="margin: 0;">+<span id="LC694" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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<pre style="margin: 0;"> <span id="LC695" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC696" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// See RtsAPI.h</span></span>
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<pre style="margin: 0;"> <span id="LC697" class="line" lang="c"><span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span> <span class="nf" style="color: #900; font-weight: 600;">rts_pause</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -679,62 +721,6 @@ Capability * rts_pause (void)</td>
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<pre style="margin: 0;"> <span id="LC721" class="line" lang="c"> <span class="n" style="color: #333;">stg_exit</span><span class="p">(</span><span class="n" style="color: #333;">EXIT_FAILURE</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC722" class="line" lang="c"> <span class="p">}</span></span>
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681
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<pre style="margin: 0;"> <span id="LC723" class="line" lang="c"></span>
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682
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<pre style="margin: 0;">-<span id="LC682" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// NOTE ghc-debug deadlock:</span></span>
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683
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<pre style="margin: 0;">-<span id="LC683" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">//</span></span>
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684
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<pre style="margin: 0;">-<span id="LC684" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// stopAllCapabilities attempts to acquire all capabilities and will only</span></span>
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685
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<pre style="margin: 0;">-<span id="LC685" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// block if an existing thread/task:</span></span>
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686
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<pre style="margin: 0;">-<span id="LC686" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">//</span></span>
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687
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<pre style="margin: 0;">-<span id="LC687" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// 1. Owns a capability and</span></span>
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688
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<pre style="margin: 0;">-<span id="LC688" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// 2. Is deadlocked i.e. refuses to yield/release its capability.</span></span>
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689
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<pre style="margin: 0;">-<span id="LC689" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">//</span></span>
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690
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<pre style="margin: 0;">-<span id="LC690" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Let's assume the rest of the RTS is deadlock free (tasks will eventually</span></span>
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691
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<pre style="margin: 0;">-<span id="LC691" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// yield their capability) outside of using the ghc-debug API:</span></span>
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692
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<pre style="margin: 0;">-<span id="LC692" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">//</span></span>
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693
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<pre style="margin: 0;">-<span id="LC693" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// * rts_pause</span></span>
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694
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<pre style="margin: 0;">-<span id="LC694" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// * rts_resume</span></span>
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695
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<pre style="margin: 0;">-<span id="LC695" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// * rts_isPaused</span></span>
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696
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<pre style="margin: 0;">-<span id="LC696" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// * rts_listThreads</span></span>
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697
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<pre style="margin: 0;">-<span id="LC697" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// * rts_listMiscRoots</span></span>
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698
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<pre style="margin: 0;">-<span id="LC698" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">//</span></span>
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699
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<pre style="margin: 0;">-<span id="LC699" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Except rts_pause, none of these functions acquire a lock and so cannot</span></span>
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700
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<pre style="margin: 0;">-<span id="LC700" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// block. rts_pause may block on stopAllCapabilities, but we ensure that the</span></span>
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701
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<pre style="margin: 0;">-<span id="LC701" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// current task does not own a capability before calling</span></span>
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702
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<pre style="margin: 0;">-<span id="LC702" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// stopAllCapabilities. Hence, (1) does not hold given an isolated call to</span></span>
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703
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<pre style="margin: 0;">-<span id="LC703" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// rts_pause. The only lose end is that after rts_pause, we now have a task</span></span>
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704
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<pre style="margin: 0;">-<span id="LC704" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// that (by design) owns all capabilities (point (1) above) and is refusing</span></span>
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705
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<pre style="margin: 0;">-<span id="LC705" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// to yield them (point (2) above). Indeed, if 2 threads concurrently call</span></span>
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706
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<pre style="margin: 0;">-<span id="LC706" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// rts_pause, one will block until the other calls rts_resume. As "correct</span></span>
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707
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<pre style="margin: 0;">-<span id="LC707" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// usage" of this API requires calling rts_resume, this case is a non-issue,</span></span>
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708
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<pre style="margin: 0;">-<span id="LC708" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// but does imply the awkward quirk that if you call rts_pause on many</span></span>
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709
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<pre style="margin: 0;">-<span id="LC709" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// threads, they will all "take turns" pausing the rts, blocking until it is</span></span>
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710
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<pre style="margin: 0;">-<span id="LC710" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// their turn. In adition, any API function that attempts to acquire a</span></span>
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711
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<pre style="margin: 0;">-<span id="LC711" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// capability (e.g. rts_lock), will block until rts_resume is called. Of</span></span>
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712
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<pre style="margin: 0;">-<span id="LC712" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// course, all ghc-debug API functions besides rts_pause do not attempt to</span></span>
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713
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<pre style="margin: 0;">-<span id="LC713" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// acquire a capability.</span></span>
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714
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<pre style="margin: 0;">-<span id="LC714" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">//</span></span>
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715
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<pre style="margin: 0;">-<span id="LC715" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// The moral to this story is that you will not dealock as long as you, on</span></span>
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716
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<pre style="margin: 0;">-<span id="LC716" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// the same thread:</span></span>
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717
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<pre style="margin: 0;">-<span id="LC717" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">//</span></span>
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718
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<pre style="margin: 0;">-<span id="LC718" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// * First call rts_pause</span></span>
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719
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<pre style="margin: 0;">-<span id="LC719" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// * Then avoid rts functions other than:</span></span>
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720
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<pre style="margin: 0;">-<span id="LC720" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// * rts_isPaused</span></span>
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721
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<pre style="margin: 0;">-<span id="LC721" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// * rts_listThreads</span></span>
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722
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<pre style="margin: 0;">-<span id="LC722" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// * rts_listMiscRoots</span></span>
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723
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<pre style="margin: 0;">-<span id="LC723" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// * AND dereferencing/inspect the heap directly e.g. using</span></span>
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724
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<pre style="margin: 0;">-<span id="LC724" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// rts_listThreads/rts_listMiscRoots and the ghc-heap library.</span></span>
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725
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<pre style="margin: 0;">-<span id="LC725" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// * Finally call rts_resume</span></span>
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726
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<pre style="margin: 0;">-<span id="LC726" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">//</span></span>
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727
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<pre style="margin: 0;">-<span id="LC727" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// TODO</span></span>
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728
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<pre style="margin: 0;">-<span id="LC728" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">//</span></span>
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729
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<pre style="margin: 0;">-<span id="LC729" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// I think we should return Capability*. We should be able to use the rest</span></span>
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730
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<pre style="margin: 0;">-<span id="LC730" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// of the rts API with that token. There are a few functions that take</span></span>
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731
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<pre style="margin: 0;">-<span id="LC731" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// `Capability **` implying that it may change capabilities. I need to</span></span>
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732
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<pre style="margin: 0;">-<span id="LC732" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// confirm, but I think that in our case, we'll just end up with the same</span></span>
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733
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<pre style="margin: 0;">-<span id="LC733" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// capability since all others are acquired already. These other API</span></span>
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734
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<pre style="margin: 0;">-<span id="LC734" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// functions may change the heap, but it is up to the caller to account for</span></span>
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735
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<pre style="margin: 0;">-<span id="LC735" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// that. Is it possible that the API can be used to start executing a</span></span>
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736
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<pre style="margin: 0;">-<span id="LC736" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// haskell thread?!?!?! That's perhaps ok as long as we reacquire the</span></span>
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737
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<pre style="margin: 0;">-<span id="LC737" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// capability at the end so we're paused.</span></span>
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738
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<pre style="margin: 0;"> <span id="LC724" class="line" lang="c"> <span class="n" style="color: #333;">task</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newBoundTask</span><span class="p">();</span> <span class="c1" style="color: #998; font-style: italic;">// TODO I'm not sure why we need this. rts_lock does this.</span></span>
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739
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725
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<pre style="margin: 0;"> <span id="LC725" class="line" lang="c"> <span class="n" style="color: #333;">stopAllCapabilities</span><span class="p">(</span><span class="nb" style="color: #0086b3;">NULL</span><span class="p">,</span> <span class="n" style="color: #333;">task</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC726" class="line" lang="c"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="749" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -763,7 +749,7 @@ void rts_resume (Capability * cap STG_UNUSED)</td>
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<pre style="margin: 0;"> <span id="LC749" class="line" lang="c"> <span class="p">}</span></span>
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750
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<pre style="margin: 0;"> <span id="LC750" class="line" lang="c"></span>
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765
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751
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<pre style="margin: 0;"> <span id="LC751" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Check that we own all capabilities.</span></span>
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766
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<pre style="margin: 0;">-<span id="LC766" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="n" style="color: #333;">uint</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">n_capabilities</span><span class="p">;</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC752" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">u<span class="idiff left">nsigned</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">n_capabilities</span><span class="p">;</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC753" class="line" lang="c"> <span class="p">{</span></span>
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768
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754
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<pre style="margin: 0;"> <span id="LC754" class="line" lang="c"> <span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">cap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">capabilities</span><span class="p">[</span><span class="n" style="color: #333;">i</span><span class="p">];</span></span>
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769
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755
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<pre style="margin: 0;"> <span id="LC755" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">running_task</span> <span class="o" style="font-weight: 600;">!=</span> <span class="n" style="color: #333;">task</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -791,7 +777,7 @@ bool rts_isPaused(void)</td>
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777
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<pre style="margin: 0;"> <span id="LC777" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC778" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Check that the rts_pause was called on this thread/task. If not, outputs an</span></span>
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// error and exits with EXIT_FAILURE.</span></span>
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<pre style="margin: 0;">-<span id="LC794" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">assert_isPausedOnMyTask</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span></span>
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780
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<pre style="margin: 0;">+<span id="LC780" class="line" lang="c"><span class="k" style="font-weight: 600;"><span class="idiff left">static</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">assert_isPausedOnMyTask</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC782" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">rts_pausing_task</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">)</span></span>
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783
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<pre style="margin: 0;"> <span id="LC783" class="line" lang="c"> <span class="p">{</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -848,14 +834,16 @@ void rts_listMiscRoots (ListRootsCb cb, void *user)</td>
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="c"><span class="p">}</span></span>
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835
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<pre style="margin: 0;"> <span id="LC835" class="line" lang="c"></span>
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836
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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851
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<pre style="margin: 0;">-<span id="LC851" class="line" lang="c"><span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span> <span class="nf" style="color: #900; font-weight: 600;">rts_pause</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="c"><span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span> <span class="nf" style="color: #900; font-weight: 600;">GNU_ATTRIBUTE</span><span class="p">(</span><span class="n" style="color: #333;">__noreturn__</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC838" class="line" lang="c"><span class="n" style="color: #333;">rts_pause</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="c"> <span class="n" style="color: #333;">errorBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"Warning: Pausing the RTS is only possible for "</span></span>
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841
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="c"> <span class="s" style="color: #d14;">"multithreaded RTS."</span><span class="p">);</span></span>
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842
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="c"> <span class="n" style="color: #333;">stg_exit</span><span class="p">(</span><span class="n" style="color: #333;">EXIT_FAILURE</span><span class="p">);</span></span>
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843
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="c"><span class="p">}</span></span>
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844
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC858" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">rts_resume</span> <span class="p">(</span><span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">cap</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC845" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">GNU_ATTRIBUTE</span><span class="p">(</span><span class="n" style="color: #333;">__noreturn__</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="c"><span class="n" style="color: #333;">rts_resume</span> <span class="p">(</span><span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">cap</span> <span class="n" style="color: #333;">STG_UNUSED</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="c"><span class="p">{</span></span>
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848
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="c"> <span class="n" style="color: #333;">errorBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"Warning: Unpausing the RTS is only possible for "</span></span>
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="c"> <span class="s" style="color: #d14;">"multithreaded RTS."</span><span class="p">);</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/daddf2b184bc79fd51823aae83a790acf76020d5...fcd2bb45fa2cbd1de83a7d233d87d0655b4cca7d#5e0aa85192ed270adfa6987ca212750750dc9a49"><strong>testsuite/tests/rts/ghc-debug/all.T</strong></a>
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<pre style="margin: 0;">-<span id="LC1" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ghc_debug_01</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','</span><span class="s1" style="color: #d14;">ghc_debug.h</span><span class="p">'])],</span></span>
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2
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="perl"> <span class="nv" style="color: #008080;">multi_compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">ghc_debug_01</span><span class="p">',</span> <span class="p">[('</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','')],</span> <span class="p">'</span><span class="s1" style="color: #d14;">-threaded </span><span class="p">'])</span></span>
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3
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ghc_debug_02</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','</span><span class="s1" style="color: #d14;">ghc_debug.h</span><span class="p">'])],</span></span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="perl"> <span class="nv" style="color: #008080;">multi_compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">ghc_debug_02</span><span class="p">',</span> <span class="p">[('</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','')],</span> <span class="p">'</span><span class="s1" style="color: #d14;">-threaded </span><span class="p">'])</span></span>
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5
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ghc_debug_03</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','</span><span class="s1" style="color: #d14;">ghc_debug.h</span><span class="p">'])],</span></span>
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6
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="perl"> <span class="nv" style="color: #008080;">multi_compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">ghc_debug_03</span><span class="p">',</span> <span class="p">[('</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','')],</span> <span class="p">'</span><span class="s1" style="color: #d14;">-threaded </span><span class="p">'])</span></span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ghc_debug_04</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','</span><span class="s1" style="color: #d14;">ghc_debug.h</span><span class="p">'])],</span></span>
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8
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="perl"> <span class="nv" style="color: #008080;">multi_compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">ghc_debug_04</span><span class="p">',</span> <span class="p">[('</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','')],</span> <span class="p">'</span><span class="s1" style="color: #d14;">-threaded </span><span class="p">'])</span></span></pre>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ghc_debug_01</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">threaded2</span><span class="p">']),</span> <span class="nv" style="color: #008080;">extra_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">threaded2</span><span class="p">']),</span></span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="perl"> <span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','</span><span class="s1" style="color: #d14;">ghc_debug.h</span><span class="p">'])],</span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="perl"> <span class="nv" style="color: #008080;">multi_compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">ghc_debug_01</span><span class="p">',</span> <span class="p">[('</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','')],</span> <span class="p">''])</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ghc_debug_02</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">threaded2</span><span class="p">']),</span> <span class="nv" style="color: #008080;">extra_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">threaded2</span><span class="p">']),</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="perl"> <span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','</span><span class="s1" style="color: #d14;">ghc_debug.h</span><span class="p">'])],</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="perl"> <span class="nv" style="color: #008080;">multi_compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">ghc_debug_02</span><span class="p">',</span> <span class="p">[('</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','')],</span> <span class="p">''])</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ghc_debug_03</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">threaded2</span><span class="p">']),</span> <span class="nv" style="color: #008080;">extra_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">threaded2</span><span class="p">']),</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="perl"> <span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','</span><span class="s1" style="color: #d14;">ghc_debug.h</span><span class="p">'])],</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="perl"> <span class="nv" style="color: #008080;">multi_compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">ghc_debug_03</span><span class="p">',</span> <span class="p">[('</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','')],</span> <span class="p">''])</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ghc_debug_04</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">threaded2</span><span class="p">']),</span> <span class="nv" style="color: #008080;">extra_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">threaded2</span><span class="p">']),</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="perl"> <span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','</span><span class="s1" style="color: #d14;">ghc_debug.h</span><span class="p">'])],</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="perl"> <span class="nv" style="color: #008080;">multi_compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">ghc_debug_04</span><span class="p">',</span> <span class="p">[('</span><span class="s1" style="color: #d14;">ghc_debug.c</span><span class="p">','')],</span> <span class="p">''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/daddf2b184bc79fd51823aae83a790acf76020d5...fcd2bb45fa2cbd1de83a7d233d87d0655b4cca7d#911c330969f2084eb95592eef1f55f7befec476a"><strong>testsuite/tests/rts/ghc-debug/shouldfail/all.T</strong></a>
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<pre style="margin: 0;">-<span id="LC1" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">unsafe_rts_pause</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">exit_code</span><span class="p">(</span><span class="mi" style="color: #099;">1</span><span class="p">)],</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-threaded </span><span class="p">'])</span></span></pre>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="perl"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">unsafe_rts_pause</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">']),</span> <span class="nv" style="color: #008080;">exit_code</span><span class="p">(</span><span class="mi" style="color: #099;">1</span><span class="p">)],</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">rts_lock_when_paused_deadlock</span><span class="p">',</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="perl"> <span class="p">[</span> <span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">threaded2</span><span class="p">']),</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="perl"> <span class="nv" style="color: #008080;">extra_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">threaded2</span><span class="p">']),</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="perl"> <span class="nv" style="color: #008080;">exit_code</span><span class="p">(</span><span class="mi" style="color: #099;">1</span><span class="p">),</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="perl"> <span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">deadlock.c</span><span class="p">','</span><span class="s1" style="color: #d14;">deadlock.h</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="perl"> <span class="p">],</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="perl"> <span class="nv" style="color: #008080;">multi_compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">rts_lock_when_paused_deadlock</span><span class="p">',</span> <span class="p">[('</span><span class="s1" style="color: #d14;">deadlock.c</span><span class="p">','')],</span> <span class="p">''])</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">rts_pause_when_locked_deadlock</span><span class="p">',</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="perl"> <span class="p">[</span> <span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">threaded2</span><span class="p">']),</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="perl"> <span class="nv" style="color: #008080;">extra_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">threaded2</span><span class="p">']),</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="perl"> <span class="nv" style="color: #008080;">exit_code</span><span class="p">(</span><span class="mi" style="color: #099;">1</span><span class="p">),</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="perl"> <span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">deadlock.c</span><span class="p">','</span><span class="s1" style="color: #d14;">deadlock.h</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="perl"> <span class="p">],</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="perl"> <span class="nv" style="color: #008080;">multi_compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">rts_pause_when_locked_deadlock</span><span class="p">',</span> <span class="p">[('</span><span class="s1" style="color: #d14;">deadlock.c</span><span class="p">','')],</span> <span class="p">''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/daddf2b184bc79fd51823aae83a790acf76020d5...fcd2bb45fa2cbd1de83a7d233d87d0655b4cca7d#53c1ad3992fd7c62ec72c68c0f8d86b573816db2"><strong>testsuite/tests/rts/ghc-debug/shouldfail/deadlock.c</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include <stdio.h></span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include <unistd.h></span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "Rts.h"</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "RtsAPI.h"</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "deadlock.h"</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Although we expect errors rather than deadlock, we don't want a failed test</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// to be a deadlocked test. Hence we use this as a 1 second timeout mechanism.</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">assertDoneAfterOneSecond</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">done</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="c"> <span class="n" style="color: #333;">sleep</span><span class="p">(</span><span class="mi" style="color: #099;">1</span><span class="p">);</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="o" style="font-weight: 600;">!*</span><span class="n" style="color: #333;">done</span><span class="p">)</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="c"> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Deadlock detected."</span><span class="p">);</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="c"> <span class="n" style="color: #333;">exit</span><span class="p">(</span><span class="mi" style="color: #099;">1</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="c"> <span class="p">}</span></span>
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19
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">lockThenPause</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">done</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Locking..."</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="c"> <span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">lockCap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rts_lock</span><span class="p">();</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Locked</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Pausing..."</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="c"> <span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">pauseCap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rts_pause</span><span class="p">();</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Paused</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Resuming..."</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="c"> <span class="n" style="color: #333;">rts_resume</span><span class="p">(</span><span class="n" style="color: #333;">pauseCap</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Resumed</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Unlocking..."</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="c"> <span class="n" style="color: #333;">rts_unlock</span><span class="p">(</span><span class="n" style="color: #333;">lockCap</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Unlocked</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">done</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">pauseThenLock</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">done</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Pausing..."</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="c"> <span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">pauseCap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rts_pause</span><span class="p">();</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Paused</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Locking..."</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="c"> <span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">lockCap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rts_lock</span><span class="p">();</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Locked</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">);</span></span>
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49
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Unlocking..."</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="c"> <span class="n" style="color: #333;">rts_unlock</span><span class="p">(</span><span class="n" style="color: #333;">lockCap</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Unlocked</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">);</span></span>
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53
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Resuming..."</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="c"> <span class="n" style="color: #333;">rts_resume</span><span class="p">(</span><span class="n" style="color: #333;">pauseCap</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"Resumed</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">done</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="c"><span class="p">}</span></span></pre>
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<li id="1c744be2844c20c5beb7609a3e53419760e59786">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/daddf2b184bc79fd51823aae83a790acf76020d5...fcd2bb45fa2cbd1de83a7d233d87d0655b4cca7d#1c744be2844c20c5beb7609a3e53419760e59786"><strong>testsuite/tests/rts/ghc-debug/shouldfail/deadlock.h</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">assertDoneAfterOneSecond</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">done</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">lockThenPause</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">done</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">pauseThenLock</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">done</span><span class="p">);</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/daddf2b184bc79fd51823aae83a790acf76020d5...fcd2bb45fa2cbd1de83a7d233d87d0655b4cca7d#121404b3882b0c54c1bddb3df50814181c98cdda"><strong>testsuite/tests/rts/ghc-debug/shouldfail/rts_lock_when_paused_deadlock.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ForeignFunctionInterface #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Concurrent</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign.C</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">System.Exit</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">System.Timeout</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="n" style="color: #333;">safe</span> <span class="s" style="color: #d14;">"deadlock.h assertDoneAfterOneSecond"</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="n" style="color: #333;">safe_assertDoneAfterOneSecond_c</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="kt" style="color: #458; font-weight: 600;">CInt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="n" style="color: #333;">safe</span> <span class="s" style="color: #d14;">"deadlock.h lockThenPause"</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="n" style="color: #333;">safe_lockThenPause_c</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="kt" style="color: #458; font-weight: 600;">CInt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alloca</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">donePtr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="diff-line-num new new_line" data-linenumber="17" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="n" style="color: #333;">poke</span> <span class="n" style="color: #333;">donePtr</span> <span class="mi" style="color: #099;">0</span></span>
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<td class="diff-line-num new new_line" data-linenumber="18" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="n" style="color: #333;">forkOS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">safe_assertDoneAfterOneSecond_c</span> <span class="n" style="color: #333;">donePtr</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="n" style="color: #333;">safe_lockThenPause_c</span> <span class="n" style="color: #333;">donePtr</span></span></pre>
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<li id="c12b3f0d535b61c7830567bebdf20e4308f92dfa">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/daddf2b184bc79fd51823aae83a790acf76020d5...fcd2bb45fa2cbd1de83a7d233d87d0655b4cca7d#c12b3f0d535b61c7830567bebdf20e4308f92dfa"><strong>testsuite/tests/rts/ghc-debug/shouldfail/rts_lock_when_paused_deadlock.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">rts_lock_when_paused_deadlock: error: rts_pause: attempting to pause from a Task that owns a capability.</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext"> Have you already acquired a capability e.g. with rts_lock?</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/daddf2b184bc79fd51823aae83a790acf76020d5...fcd2bb45fa2cbd1de83a7d233d87d0655b4cca7d#67de29af0ead130cee81589ec58de16ea127cf19"><strong>testsuite/tests/rts/ghc-debug/shouldfail/rts_lock_when_paused_deadlock.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">Locking...Locked</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">Pausing...</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/daddf2b184bc79fd51823aae83a790acf76020d5...fcd2bb45fa2cbd1de83a7d233d87d0655b4cca7d#b92396a86a09cfa581a7bdcaf2d6afb3bda1d660"><strong>testsuite/tests/rts/ghc-debug/shouldfail/rts_pause_when_locked_deadlock.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ForeignFunctionInterface #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Concurrent</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign.C</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">System.Exit</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">System.Timeout</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="n" style="color: #333;">safe</span> <span class="s" style="color: #d14;">"deadlock.h assertDoneAfterOneSecond"</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="n" style="color: #333;">safe_assertDoneAfterOneSecond_c</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="kt" style="color: #458; font-weight: 600;">CInt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="n" style="color: #333;">safe</span> <span class="s" style="color: #d14;">"deadlock.h pauseThenLock"</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="n" style="color: #333;">safe_pauseThenLock_c</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="kt" style="color: #458; font-weight: 600;">CInt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alloca</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">donePtr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="n" style="color: #333;">poke</span> <span class="n" style="color: #333;">donePtr</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="n" style="color: #333;">forkOS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">safe_assertDoneAfterOneSecond_c</span> <span class="n" style="color: #333;">donePtr</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="n" style="color: #333;">safe_pauseThenLock_c</span> <span class="n" style="color: #333;">donePtr</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/daddf2b184bc79fd51823aae83a790acf76020d5...fcd2bb45fa2cbd1de83a7d233d87d0655b4cca7d#591a7a6dddcd2160d17e957c5fd03974cbbf2475"><strong>testsuite/tests/rts/ghc-debug/shouldfail/rts_pause_when_locked_deadlock.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">rts_pause_when_locked_deadlock: error: rts_lock: The RTS is already paused by this thread.</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext"> There is no need to call rts_lock if you have already call rts_pause.</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/daddf2b184bc79fd51823aae83a790acf76020d5...fcd2bb45fa2cbd1de83a7d233d87d0655b4cca7d#cd3508e5a129b01453f28866e272c5251bb94a93"><strong>testsuite/tests/rts/ghc-debug/shouldfail/rts_pause_when_locked_deadlock.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">Pausing...Paused</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">Locking...</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/daddf2b184bc79fd51823aae83a790acf76020d5...fcd2bb45fa2cbd1de83a7d233d87d0655b4cca7d#b3645895796b21dc72ea31c191b1488827d3b0ae"><strong>testsuite/tests/rts/ghc-debug/shouldfail/unsafe_rts_pause.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -8,10 +8,10 @@ import Foreign.Ptr</td>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">System.Mem</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RtsPause</span></span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Capability</span></span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="n" style="color: #333;">unsafe</span> <span class="s" style="color: #d14;">"RtsAPI.h rts_pause"</span></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="haskell"> <span class="n" style="color: #333;">unsafe_rts_pause_c</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RtsPause</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="n" style="color: #333;">unsafe_rts_pause_c</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Capability</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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