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<h3>
Marge Bot pushed to branch master
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/074c1ccd3f8c3fcab117e336316173e8e869230a">074c1ccd</a></strong>
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<span>by Andreas Klebinger</span>
<i>at 2020-04-14T07:55:55-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Small change to the windows ticker.
We already have a function to go from time to ms so use it.
Also expand on the state of timer resolution.
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<h4>1 changed file:</h4>
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rts/win32/Ticker.c
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<h4>Changes:</h4>
<li id="a109f152067235319ebeb3dc8104257877964211">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/074c1ccd3f8c3fcab117e336316173e8e869230a#a109f152067235319ebeb3dc8104257877964211"><strong>rts/win32/Ticker.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">@@ -30,6 +30,12 @@ static VOID CALLBACK tick_callback(</td>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// be very useful for profiling with a max usable resolution of</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;">// 15ms. Unfortunately we don't have anything better.</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="c"></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;">// Update as of 2020-04-02:</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// It seems we can get somewhat reliable resolution even for intervals</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// at 1ms which had an average error of <5%.</span></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;">// This seems to be the case starting at some point during the</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Windows 7 lifetime and any newer versions of windows.</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC39" 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="LC40" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">initTicker</span> <span class="p">(</span><span class="n" style="color: #333;">Time</span> <span class="n" style="color: #333;">interval</span><span class="p">,</span> <span class="n" style="color: #333;">TickProc</span> <span class="n" style="color: #333;">handle_tick</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC41" 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">@@ -53,7 +59,7 @@ startTicker(void)</td>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="c"> <span class="n" style="color: #333;">tick_callback</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="c"> <span class="mi" style="color: #099;">0</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="c"> <span class="mi" style="color: #099;">0</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;">TimeTo<span class="idiff left">US</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">tick_interval</span></span><span class="p"><span class="idiff">)</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">1000</span></span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">// ms</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="c"> <span class="n" style="color: #333;">TimeTo<span class="idiff left">MS</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">tick_interval</span></span><span class="p"><span class="idiff right">)</span>,</span> <span class="c1" style="color: #998; font-style: italic;">// ms</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="c"> <span class="n" style="color: #333;">WT_EXECUTEINTIMERTHREAD</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC64" 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="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="c"> <span class="n" style="color: #333;">sysErrorBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"CreateTimerQueueTimer"</span><span class="p">);</span></span>
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