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<h3>
Ben Gamari pushed to branch wip/T18210
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb25301757aa52dc6e574b3a2beedc43bcd2d286">eb253017</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-05-24T21:54:58-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">eventlog: Fix racy flushing
Previously no attempt was made to avoid multiple threads writing their
capability-local eventlog buffers to the eventlog writer simultaneously.
This could result in multiple eventlog streams being interleaved. Fix
this by documenting that the EventLogWriter's write() and flush()
functions may be called reentrantly and fix the default writer to
protect its FILE* by a mutex.
Fixes #18210.
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<h4>3 changed files:</h4>
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<li class="file-stats">
<a href="#6ae923e173536bf0ddb39552416a7e21767287db">
docs/users_guide/runtime_control.rst
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<li class="file-stats">
<a href="#a1d25ba13887eca47ad71301d419574bea4696a0">
includes/rts/EventLogWriter.h
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<li class="file-stats">
<a href="#c3e03f58006993eb453b46fb32b8425e5d10f2f3">
rts/eventlog/EventLogWriter.c
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<h4>Changes:</h4>
<li id="6ae923e173536bf0ddb39552416a7e21767287db">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb25301757aa52dc6e574b3a2beedc43bcd2d286#6ae923e173536bf0ddb39552416a7e21767287db"><strong>docs/users_guide/runtime_control.rst</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="196" 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="196" 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">@@ -196,11 +196,17 @@ Furthermore GHC lets you specify the way event log data (see :rts-flag:`-l</td>
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<pre style="margin: 0;"> <span id="LC196" class="line" lang="plaintext"> Hands buffered event log data to your event log writer. Return true on success.</span>
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="plaintext"> Required for a custom :c:type:`EventLogWriter`.</span>
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="plaintext"> Note that this function may be called by multiple threads</span>
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="plaintext"> simultaneously.</span>
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="plaintext"> .. c:member:: void flushEventLog(void)</span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="plaintext"> Flush buffers (if any) of your custom :c:type:`EventLogWriter`. This can</span>
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="plaintext"> be ``NULL``.</span>
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="plaintext"> Note that this function may be called by multiple threads</span>
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="plaintext"> simultaneously.</span>
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="plaintext"> .. c:member:: void stopEventLogWriter(void)</span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="plaintext"> Called when event logging is about to stop. This can be ``NULL``.</span>
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<li id="a1d25ba13887eca47ad71301d419574bea4696a0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb25301757aa52dc6e574b3a2beedc43bcd2d286#a1d25ba13887eca47ad71301d419574bea4696a0"><strong>includes/rts/EventLogWriter.h</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">@@ -24,9 +24,13 @@ typedef struct {</td>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="p">(</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">initEventLogWriter</span><span class="p">)</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="LC25" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Write a series of events returning true on success.</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Note that this may be called by multiple threads simultaneously.</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// The writer is responsible for concurrency control.</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="c"> <span class="n" style="color: #333;">bool</span> <span class="p">(</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">writeEventLog</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">eventlog</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">size_t</span> <span class="n" style="color: #333;">eventlog_size</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Flush possibly existing buffers (may be NULL)</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Note that this may be called by multiple threads simultaneously.</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// The writer is responsible for concurrency control.</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="p">(</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">flushEventLog</span><span class="p">)</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="LC35" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Close an initialized EventLogOutput (may be NULL)</span></span>
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<li id="c3e03f58006993eb453b46fb32b8425e5d10f2f3">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb25301757aa52dc6e574b3a2beedc43bcd2d286#c3e03f58006993eb453b46fb32b8425e5d10f2f3"><strong>rts/eventlog/EventLogWriter.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">@@ -28,11 +28,22 @@ static pid_t event_log_pid = -1;</td>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// File for logging events</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">FILE</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">event_log_file</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="LC31" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Protects event log file</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="n" style="color: #333;">Mutex</span> <span class="n" style="color: #333;">event_log_mutex</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">initEventLogFileWriter</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="LC35" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="n" style="color: #333;">bool</span> <span class="nf" style="color: #900; font-weight: 600;">writeEventLogFile</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">eventlog</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">size_t</span> <span class="n" style="color: #333;">eventlog_size</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">flushEventLogFile</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="LC37" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">stopEventLogFileWriter</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="LC39" 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="LC40" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">acquire_event_log_lock</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span> <span class="p">{</span> <span class="n" style="color: #333;">ACQUIRE_LOCK</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">event_log_mutex</span><span class="p">);</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">release_event_log_lock</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span> <span class="p">{</span> <span class="n" style="color: #333;">RELEASE_LOCK</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">event_log_mutex</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="cp" style="color: #999; font-weight: 600;">#else</span></span>
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<td class="diff-line-num new new_line" data-linenumber="43" 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">
43
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">acquire_event_log_lock</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span> <span class="p">{}</span></span>
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<td class="diff-line-num new new_line" data-linenumber="44" 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="LC44" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">release_event_log_lock</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span> <span class="p">{}</span></span>
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<pre style="margin: 0;">+<span id="LC45" 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="LC46" class="line" lang="c"></span>
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36
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="o" style="font-weight: 600;">*</span><span class="nf" style="color: #900; font-weight: 600;">outputFileName</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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37
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48
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="c"><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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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="89" 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="100" 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">@@ -89,6 +100,9 @@ initEventLogFileWriter(void)</td>
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89
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100
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="c"> <span class="p">}</span></span>
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90
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101
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="c"></span>
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91
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102
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="c"> <span class="n" style="color: #333;">stgFree</span><span class="p">(</span><span class="n" style="color: #333;">event_log_filename</span><span class="p">);</span></span>
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103
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(THREADED_RTS)</span></span>
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104
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="c"> <span class="n" style="color: #333;">initMutex</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">event_log_mutex</span><span class="p">);</span></span>
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105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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106
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="c"><span class="p">}</span></span>
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107
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="c"></span>
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108
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="n" style="color: #333;">bool</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="97" 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="111" 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">@@ -97,15 +111,17 @@ writeEventLogFile(void *eventlog, size_t eventlog_size)</td>
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97
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111
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">begin</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eventlog</span><span class="p">;</span></span>
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<td class="diff-line-num old_line" data-linenumber="98" 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">
98
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112
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">size_t</span> <span class="n" style="color: #333;">remain</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eventlog_size</span><span class="p">;</span></span>
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99
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<td class="diff-line-num new_line" data-linenumber="113" 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">
113
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="c"></span>
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<td class="diff-line-num new new_line" data-linenumber="114" 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">
114
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="c"> <span class="n" style="color: #333;">acquire_event_log_lock</span><span class="p">();</span></span>
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<td class="diff-line-num old_line" data-linenumber="100" 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">
100
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<td class="diff-line-num new_line" data-linenumber="115" 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">
115
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="c"> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="n" style="color: #333;">remain</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="diff-line-num old_line" data-linenumber="101" 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">
101
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<td class="diff-line-num new_line" data-linenumber="116" 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">
116
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">size_t</span> <span class="n" style="color: #333;">written</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fwrite</span><span class="p">(</span><span class="n" style="color: #333;">begin</span><span class="p">,</span> <span class="mi" style="color: #099;">1</span><span class="p">,</span> <span class="n" style="color: #333;">remain</span><span class="p">,</span> <span class="n" style="color: #333;">event_log_file</span><span class="p">);</span></span>
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<td class="diff-line-num old_line" data-linenumber="102" 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">
102
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<td class="diff-line-num new_line" data-linenumber="117" 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">
117
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">written</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="diff-line-num new old_line" data-linenumber="103" 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="118" 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">
118
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="c"> <span class="n" style="color: #333;">release_event_log_lock</span><span class="p">();</span></span>
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<td class="diff-line-num old_line" data-linenumber="103" 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">
103
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<td class="diff-line-num new_line" data-linenumber="119" 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">
119
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="nb" style="color: #0086b3;">false</span><span class="p">;</span></span>
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<td class="diff-line-num old_line" data-linenumber="104" 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">
104
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<td class="diff-line-num new_line" data-linenumber="120" 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">
120
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="c"> <span class="p">}</span></span>
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<td class="diff-line-num old_line" data-linenumber="105" 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">
105
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<td class="diff-line-num new_line" data-linenumber="121" 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">
121
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="c"> <span class="n" style="color: #333;">remain</span> <span class="o" style="font-weight: 600;">-=</span> <span class="n" style="color: #333;">written</span><span class="p">;</span></span>
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<td class="diff-line-num old_line" data-linenumber="106" 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">
106
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<td class="diff-line-num new_line" data-linenumber="122" 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">
122
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="c"> <span class="n" style="color: #333;">begin</span> <span class="o" style="font-weight: 600;">+=</span> <span class="n" style="color: #333;">written</span><span class="p">;</span></span>
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107
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123
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="c"> <span class="p">}</span></span>
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108
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<pre style="margin: 0;">-<span id="LC108" class="line" lang="c"></span>
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<td class="diff-line-num new old_line" data-linenumber="109" 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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124
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="c"> <span class="n" style="color: #333;">release_event_log_lock</span><span class="p">();</span></span>
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<td class="diff-line-num old_line" data-linenumber="109" 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">
109
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<td class="diff-line-num new_line" data-linenumber="125" 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">
125
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="nb" style="color: #0086b3;">true</span><span class="p">;</span></span>
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<td class="diff-line-num old_line" data-linenumber="110" 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">
110
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<td class="diff-line-num new_line" data-linenumber="126" 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">
126
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="c"><span class="p">}</span></span>
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<td class="diff-line-num old_line" data-linenumber="111" 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">
111
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<td class="diff-line-num new_line" data-linenumber="127" 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">
127
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="c"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="124" 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="140" 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">@@ -124,6 +140,9 @@ stopEventLogFileWriter(void)</td>
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124
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<td class="diff-line-num new_line" data-linenumber="140" 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">
140
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="c"> <span class="n" style="color: #333;">fclose</span><span class="p">(</span><span class="n" style="color: #333;">event_log_file</span><span class="p">);</span></span>
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125
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<td class="diff-line-num new_line" data-linenumber="141" 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">
141
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="c"> <span class="n" style="color: #333;">event_log_file</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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126
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<td class="diff-line-num new_line" data-linenumber="142" 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">
142
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="c"> <span class="p">}</span></span>
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<td class="diff-line-num new new_line" data-linenumber="143" 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">
143
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(THREADED_RTS)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="144" 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">
144
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="c"> <span class="n" style="color: #333;">closeMutex</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">event_log_mutex</span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="145" 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">
145
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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127
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<td class="diff-line-num new_line" data-linenumber="146" 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">
146
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="c"><span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">EventLogWriter</span> <span class="n" style="color: #333;">FileEventLogWriter</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">{</span></span>
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