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<h3>
Ben Gamari pushed to branch wip/T19075
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/c7bfd425000955b130f76011492340f0dbc9c565">c7bfd425</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-12-16T09:35:05-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Messages: Relax locked-closure assertion

In general we are less careful about locking closures when running with
only a single capability.

Fixes #19075.
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<h4>1 changed file:</h4>
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<a href="#f639149fde351603cc3df9c8c4ba87744bcfc523">
rts/Messages.h
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<h4>Changes:</h4>
<li id="f639149fde351603cc3df9c8c4ba87744bcfc523">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c7bfd425000955b130f76011492340f0dbc9c565#f639149fde351603cc3df9c8c4ba87744bcfc523"><strong>rts/Messages.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">@@ -25,8 +25,9 @@ void sendMessage    (Capability *from_cap, Capability *to_cap, Message *msg);</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="c"><span class="n" style="color: #333;">INLINE_HEADER</span> <span class="kt" style="color: #458; font-weight: 600;">void</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">doneWithMsgThrowTo</span> <span class="p">(</span><span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="n" style="color: #333;">MessageThrowTo</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">m</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="c"><span class="p">{</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 message better be locked</span></span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="c">    <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">m</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">==</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_WHITEHOLE_info</span><span class="p">);</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 message better be locked (unless we are running single-threaded,</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="c">    <span class="c1" style="color: #998; font-style: italic;">// where we are a bit more lenient (#19075).</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="c">    <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">n_capabilities</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;">m</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">==</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_WHITEHOLE_info</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="c">    <span class="n" style="color: #333;">IF_NONMOVING_WRITE_BARRIER_ENABLED</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="c">      <span class="n" style="color: #333;">updateRemembSetPushClosure</span><span class="p">(</span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">m</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">link</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="c">      <span class="n" style="color: #333;">updateRemembSetPushClosure</span><span class="p">(</span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">m</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">source</span><span class="p">);</span></span>
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