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<h3>
Ben Gamari pushed to branch wip/T18272
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/58fad7d43479766f3a66dd1ef9cc4edbe84ff372">58fad7d4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-31T13:28:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add Windows-specific implementation of rtsSleep

Previously we would use the POSIX path, which uses `nanosleep`. However,
it turns out that `nanosleep` is provided by `libpthread` on Windows. In
general we don't want to incur such a dependency. Avoid this by simply
using `Sleep` on Windows.

Fixes #18272.
</pre>
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<h4>1 changed file:</h4>
<ul>
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<a href="#27cb86672934df00aaf4c3f180d7426dfce55f86">
rts/RtsUtils.c
</a>
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<h4>Changes:</h4>
<li id="27cb86672934df00aaf4c3f180d7426dfce55f86">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58fad7d43479766f3a66dd1ef9cc4edbe84ff372#27cb86672934df00aaf4c3f180d7426dfce55f86"><strong>rts/RtsUtils.c</strong></a>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">   Sleep for the given period of time.</span></span>
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<pre style="margin: 0;"> <span id="LC157" 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="LC158" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* Returns -1 on failure but handles EINTR internally.</span></span>
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<pre style="margin: 0;">-<span id="LC160" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * <span class="idiff left right">N.B. usleep has been removed from POSIX 2008</span> */</span></span>
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* Returns -1 on failure but handles EINTR internally.<span class="idiff left right"> On Windows this will</span></span></span>
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * <span class="idiff left right">only have millisecond precision.</span> */</span></span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="nf" style="color: #900; font-weight: 600;">rtsSleep</span><span class="p">(</span><span class="n" style="color: #333;">Time</span> <span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(_WIN32)</span></span>
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="c">    <span class="c1" style="color: #998; font-style: italic;">// N.B. we can't use nanosleep on Windows as it would incur a pthreads</span></span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="c">    <span class="c1" style="color: #998; font-style: italic;">// dependency. See #18272.</span></span>
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="c">    <span class="n" style="color: #333;">Sleep</span><span class="p">(</span><span class="n" style="color: #333;">TimeToMS</span><span class="p">(</span><span class="n" style="color: #333;">t</span><span class="p">));</span></span>
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="c">    <span class="k" style="font-weight: 600;">return</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="c">    <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">timespec</span> <span class="n" style="color: #333;">req</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="c">    <span class="n" style="color: #333;">req</span><span class="p">.</span><span class="n" style="color: #333;">tv_sec</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">TimeToSeconds</span><span class="p">(</span><span class="n" style="color: #333;">t</span><span class="p">);</span></span>
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165
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171
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="c">    <span class="n" style="color: #333;">req</span><span class="p">.</span><span class="n" style="color: #333;">tv_nsec</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">TimeToNS</span><span class="p">(</span><span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">req</span><span class="p">.</span><span class="n" style="color: #333;">tv_sec</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">TIME_RESOLUTION</span><span class="p">);</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="168" 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="174" 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">@@ -168,6 +174,7 @@ int rtsSleep(Time t)</td>
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168
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174
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="c">        <span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nanosleep</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">req</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">req</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="c">    <span class="p">}</span> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">==</span> <span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">errno</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">EINTR</span><span class="p">);</span></span>
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170
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<td class="diff-line-num new_line" data-linenumber="176" 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="LC176" class="line" lang="c">    <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">ret</span><span class="p">;</span></span>
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<td class="diff-line-num new old_line" data-linenumber="171" 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="LC177" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif </span><span class="cm" style="color: #998; font-style: italic;">/* _WIN32 */</span></span>
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="c"><span class="p">}</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="172" 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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<td class="diff-line-num new_line" data-linenumber="179" 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">
179
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="c"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="173" 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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<td class="diff-line-num new_line" data-linenumber="180" 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">
180
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* -----------------------------------------------------------------------------</span></span>
</pre>
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