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<h3>
Ben Gamari pushed to branch wip/tsan/all
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/1ce9c5c7272b4b9dba18fc93b5b913ef7b34247b">1ce9c5c7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-20T14:45:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Accept benign races in Proftimer
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/03b5dc44ffc0517c90301ee41b7cad4e81a55404">03b5dc44</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-20T14:45:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Pause timer while changing capability count
This avoids #17289.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f82573421d6bd1be4f9236141596ad175dead93c">f8257342</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-20T14:45:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #17289
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/60aeb584455dc668140986b475ccb5b2dcada30a">60aeb584</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-20T14:45:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">suppress #17289 (ticker) race
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d7885a858f69f358202760c4fff9225eb031bd9e">d7885a85</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-20T14:45:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix timer initialization
Previously `initScheduler` would attempt to pause the ticker and in so
doing acquire the ticker mutex. However, initTicker, which is
responsible for initializing said mutex, hadn't been called
yet.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c5da3791f9a4ba6bdf91c231c7bbaed0ee1a6b2e">c5da3791</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-20T14:45:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Annotate benign race in ticker shutdown logic
We are guaranteed to see the change in the `stopped` flag at some point
so the race is harmless.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ca66a68098773586d5c8c565964cf421df5a57c0">ca66a680</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-20T14:46:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge branch 'wip/tsan/timer' into wip/tsan/all
</pre>
</li>
</ul>
<h4>1 changed file:</h4>
<ul>
<li class="file-stats">
<a href="#ec675bd1dfbb74e562acdc649628789841b48f75">
rts/posix/itimer/Pthread.c
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="ec675bd1dfbb74e562acdc649628789841b48f75">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e93ed3e60a09f1083dbd697562d2063f783ba5e3...ca66a68098773586d5c8c565964cf421df5a57c0#ec675bd1dfbb74e562acdc649628789841b48f75"><strong>rts/posix/itimer/Pthread.c</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="189" 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="189" 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">@@ -189,7 +189,7 @@ void</td>
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189
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">startTicker</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="190" 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">
190
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190
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="c"><span class="p">{</span></span>
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<td class="diff-line-num old_line" data-linenumber="191" 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">
191
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="c"> <span class="n" style="color: #333;">OS_ACQUIRE_LOCK</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">mutex</span><span class="p">);</span></span>
</pre>
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192
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<td class="diff-line-num new_line old" data-linenumber="192" 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="LC192" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left">stopped</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff right">0</span></span><span class="p">;</span></span>
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<td class="diff-line-num new old_line" data-linenumber="193" 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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<td class="diff-line-num new new_line" data-linenumber="192" 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">
192
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left">RELAXED_STORE</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">&</span></span><span class="n" style="color: #333;"><span class="idiff">stopped</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nb" style="color: #0086b3;"><span class="idiff">false</span></span><span class="p"><span class="idiff right">)</span>;</span></span>
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<td class="diff-line-num old_line" data-linenumber="193" 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">
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="c"> <span class="n" style="color: #333;">signalCondition</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">start_cond</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="c"> <span class="n" style="color: #333;">OS_RELEASE_LOCK</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">mutex</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="c"><span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="199" 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="199" 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">@@ -199,7 +199,7 @@ void</td>
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199
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">stopTicker</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="LC200" class="line" lang="c"><span class="p">{</span></span>
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<td class="diff-line-num old_line" data-linenumber="201" 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">
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="c"> <span class="n" style="color: #333;">OS_ACQUIRE_LOCK</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">mutex</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left">stopped</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="p"><span class="idiff right">;</span></span></span>
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left">RELAXED_STORE</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">&</span></span><span class="n" style="color: #333;"><span class="idiff">stopped</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nb" style="color: #0086b3;"><span class="idiff">true</span></span><span class="p"><span class="idiff">)</span></span><span class="o" style="font-weight: 600;"><span class="idiff right">:</span></span></span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="c"> <span class="n" style="color: #333;">OS_RELEASE_LOCK</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">mutex</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="c"></span>
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