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<h3>
Ben Gamari pushed to branch wip/tsan/timer
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5745baadf8f5aa837c8c640cd6852a5b7f31b435">5745baad</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-10-20T15:19:59-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix races in Pthread timer backend shudown
We can generally be pretty relaxed in the barriers here since the timer
thread is a loop.
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<h4>1 changed file:</h4>
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rts/posix/itimer/Pthread.c
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<h4>Changes:</h4>
<li id="ec675bd1dfbb74e562acdc649628789841b48f75">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5745baadf8f5aa837c8c640cd6852a5b7f31b435#ec675bd1dfbb74e562acdc649628789841b48f75"><strong>rts/posix/itimer/Pthread.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">@@ -85,11 +85,11 @@ static Time itimer_interval = DEFAULT_TICK_INTERVAL;</td>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Should we be firing ticks?</span></span>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Writers to this must hold the mutex below.</span></span>
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<pre style="margin: 0;">-<span id="LC88" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="k" style="font-weight: 600;"><span class="idiff left">volatile</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">stopped</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">false</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">stopped</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">false</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// should the ticker thread exit?</span></span>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// This can be set without holding the mutex.</span></span>
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<pre style="margin: 0;">-<span id="LC92" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="k" style="font-weight: 600;"><span class="idiff left">volatile</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">exited</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">true</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">exited</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">true</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Signaled when we want to (re)start the timer</span></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="n" style="color: #333;">Condition</span> <span class="n" style="color: #333;">start_cond</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">@@ -120,7 +120,9 @@ static void *itimer_thread_func(void *_handle_tick)</td>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC121" 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="LC122" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC123" class="line" lang="c"> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">exited</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Relaxed is sufficient: If we don't see that exited was set in one iteration we will</span></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// see it next time.</span></span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="c"> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">RELAXED_LOAD</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">exited</span><span class="p">))</span> <span class="p">{</span></span>
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124
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126
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">USE_TIMERFD_FOR_ITIMER</span><span class="p">)</span> <span class="p">{</span></span>
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125
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127
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">ssize_t</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">read</span><span class="p">(</span><span class="n" style="color: #333;">timerfd</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">nticks</span><span class="p">,</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">nticks</span><span class="p">));</span></span>
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126
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128
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">((</span><span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">errno</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 unfold js-unfold old_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">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="144" 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">@@ -142,7 +144,8 @@ static void *itimer_thread_func(void *_handle_tick)</td>
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142
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144
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="c"> <span class="p">}</span></span>
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143
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145
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="c"></span>
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144
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146
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// first try a cheap test</span></span>
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145
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<pre style="margin: 0;">-<span id="LC145" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">stopped</span><span class="p">)</span> <span class="p">{</span></span>
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147
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="c"> <span class="n" style="color: #333;">TSAN_ANNOTATE_BENIGN_RACE</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stopped</span><span class="p">,</span> <span class="s" style="color: #d14;">"itimer_thread_func"</span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="148" 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">
148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">RELAXED_LOAD</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stopped</span><span class="p">))</span> <span class="p">{</span></span>
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146
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149
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<pre style="margin: 0;"> <span id="LC149" 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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147
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150
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// should we really stop?</span></span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">stopped</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="186" 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">@@ -186,7 +189,7 @@ void</td>
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186
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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>
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187
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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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188
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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>
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189
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<pre style="margin: 0;">-<span id="LC189" 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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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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190
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193
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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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191
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194
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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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195
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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="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -196,7 +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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197
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200
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="c"><span class="p">{</span></span>
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201
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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="LC199" 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">1</span></span><span class="p">;</span></span>
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202
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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 right">)</span>;</span></span>
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200
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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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204
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="c"><span class="p">}</span></span>
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202
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205
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="c"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="207" 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">@@ -204,8 +207,8 @@ stopTicker(void)</td>
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207
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span></span>
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">exitTicker</span> <span class="p">(</span><span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">wait</span><span class="p">)</span></span>
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209
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<pre style="margin: 0;"> <span id="LC209" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;"><span class="idiff left right">exited</span></span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC208" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left">exited</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="nb" style="color: #0086b3;"><span class="idiff right">true</span></span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;"><span class="idiff left">SEQ_CST_LOAD</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">exited</span></span><span class="p"><span class="idiff right">)</span>);</span></span>
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<pre style="margin: 0;">+<span id="LC211" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left">SEQ_CST_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">exited</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 right">)</span>;</span></span>
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// ensure that ticker wakes up if stopped</span></span>
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="c"> <span class="n" style="color: #333;">startTicker</span><span class="p">();</span></span>
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<pre style="margin: 0;"> <span id="LC214" class="line" lang="c"></span>
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