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<h3>
Ben Gamari pushed to branch ghc-9.0
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b944fd08884527c4fee7286ac60e0a9bd6ebf424">b944fd08</a></strong>
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<span>by Viktor Dukhovni</span>
<i>at 2020-11-27T18:39:43-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">8.10 - dirty MVAR after mutating TSO queue head
While the original head and tail of the TSO queue may be in the same
generation as the MVAR, interior elements of the queue could be younger
after a GC run and may then be exposed by putMVar operation that updates
the queue head.
Resolves #18919
(cherry picked from commit 699facec0bc8dd7d5b82cc537fbf131b74f5bd2c)
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<h4>2 changed files:</h4>
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<a href="#6db965f97cbab901f493506a385bcf1283009921">
rts/PrimOps.cmm
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<a href="#a5d219117032120cc7bde9f13451d9627cff5614">
rts/Threads.c
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<h4>Changes:</h4>
<li id="6db965f97cbab901f493506a385bcf1283009921">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b944fd08884527c4fee7286ac60e0a9bd6ebf424#6db965f97cbab901f493506a385bcf1283009921"><strong>rts/PrimOps.cmm</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">@@ -1812,9 +1812,16 @@ loop:</td>
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<pre style="margin: 0;"> <span id="LC1812" class="line" lang="ghc-cmm"> <span class="c1" style="color: #998; font-style: italic;">// There are readMVar/takeMVar(s) waiting: wake up the first one</span></span>
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<pre style="margin: 0;"> <span id="LC1813" class="line" lang="ghc-cmm"></span>
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<pre style="margin: 0;"> <span id="LC1814" class="line" lang="ghc-cmm"> <span class="nl">tso</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">StgMVarTSOQueue_tso</span><span class="p">(</span><span class="nl">q</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC1815" class="line" lang="ghc-cmm"> <span class="nf" style="color: #900; font-weight: 600;">StgMVar_head</span><span class="p">(</span><span class="nl">mvar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">StgMVarTSOQueue_link</span><span class="p">(</span><span class="nl">q</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC1816" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">StgMVar_head</span><span class="p">(</span><span class="nl">mvar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">stg_END_TSO_QUEUE_closure</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC1815" class="line" lang="ghc-cmm"> <span class="nl">q</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">StgMVarTSOQueue_link</span><span class="p">(</span><span class="nl">q</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC1816" class="line" lang="ghc-cmm"> <span class="nf" style="color: #900; font-weight: 600;">StgMVar_head</span><span class="p">(</span><span class="nl">mvar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="nl">q</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC1817" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="nl">q</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">stg_END_TSO_QUEUE_closure</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC1818" class="line" lang="ghc-cmm"> <span class="nf" style="color: #900; font-weight: 600;">StgMVar_tail</span><span class="p">(</span><span class="nl">mvar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="nl">stg_END_TSO_QUEUE_closure</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC1819" class="line" lang="ghc-cmm"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC1820" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="nl">info</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">stg_MVAR_CLEAN_info</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC1821" class="line" lang="ghc-cmm"> <span class="c1" style="color: #998; font-style: italic;">// Resolve #18919.</span></span>
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<pre style="margin: 0;">+<span id="LC1822" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">ccall</span> <span class="nf" style="color: #900; font-weight: 600;">dirty_MVAR</span><span class="p">(</span><span class="vg" style="color: #008080;">BaseReg</span> <span class="dl">"</span><span class="s" style="color: #d14;">ptr</span><span class="dl">"</span><span class="p">,</span> <span class="nl">mvar</span> <span class="dl">"</span><span class="s" style="color: #d14;">ptr</span><span class="dl">"</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC1823" class="line" lang="ghc-cmm"> <span class="nf" style="color: #900; font-weight: 600;">StgMVar_value</span><span class="p">(</span><span class="nl">mvar</span><span class="p">)</span> <span class="dl">"</span><span class="s" style="color: #d14;">ptr</span><span class="dl">"</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC1824" class="line" lang="ghc-cmm"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1825" class="line" lang="ghc-cmm"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1826" class="line" lang="ghc-cmm"></span>
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<pre style="margin: 0;"> <span id="LC1827" class="line" lang="ghc-cmm"> <span class="nf" style="color: #900; font-weight: 600;">ASSERT</span><span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">StgTSO_block_info</span><span class="p">(</span><span class="nl">tso</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">mvar</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">@@ -1839,10 +1846,8 @@ loop:</td>
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<pre style="margin: 0;"> <span id="LC1846" class="line" lang="ghc-cmm"></span>
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<pre style="margin: 0;"> <span id="LC1847" class="line" lang="ghc-cmm"> <span class="c1" style="color: #998; font-style: italic;">// If it was a readMVar, then we can still do work,</span></span>
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1841
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1848
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<pre style="margin: 0;"> <span id="LC1848" class="line" lang="ghc-cmm"> <span class="c1" style="color: #998; font-style: italic;">// so loop back. (XXX: This could take a while)</span></span>
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<pre style="margin: 0;">-<span id="LC1842" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="nl">why_blocked</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">BlockedOnMVarRead</span><span class="p">)</span> <span class="p">{</span></span>
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1843
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<td class="diff-line-num new_line old" data-linenumber="1849" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1843" class="line" lang="ghc-cmm"> <span class="nl">q</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">StgMVarTSOQueue_link</span><span class="p">(</span><span class="nl">q</span><span class="p">);</span></span>
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1849
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<pre style="margin: 0;">+<span id="LC1849" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="nl">why_blocked</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">BlockedOnMVarRead</span><span class="p">)</span></span>
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1850
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<pre style="margin: 0;"> <span id="LC1850" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">goto</span> <span class="nl">loop</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC1845" class="line" lang="ghc-cmm"> <span class="p">}</span></span>
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1846
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1851
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<pre style="margin: 0;"> <span id="LC1851" class="line" lang="ghc-cmm"></span>
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1847
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<pre style="margin: 0;"> <span id="LC1852" class="line" lang="ghc-cmm"> <span class="nf" style="color: #900; font-weight: 600;">ASSERT</span><span class="p">(</span><span class="nl">why_blocked</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">BlockedOnMVar</span><span class="p">);</span></span>
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1853
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<pre style="margin: 0;"> <span id="LC1853" class="line" lang="ghc-cmm"></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">@@ -1897,9 +1902,16 @@ loop:</td>
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1897
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1902
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<pre style="margin: 0;"> <span id="LC1902" class="line" lang="ghc-cmm"> <span class="c1" style="color: #998; font-style: italic;">// There are takeMVar(s) waiting: wake up the first one</span></span>
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1898
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1903
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<pre style="margin: 0;"> <span id="LC1903" class="line" lang="ghc-cmm"></span>
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1899
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1904
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<pre style="margin: 0;"> <span id="LC1904" class="line" lang="ghc-cmm"> <span class="nl">tso</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">StgMVarTSOQueue_tso</span><span class="p">(</span><span class="nl">q</span><span class="p">);</span></span>
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1900
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<pre style="margin: 0;">-<span id="LC1900" class="line" lang="ghc-cmm"> <span class="nf" style="color: #900; font-weight: 600;">StgMVar_head</span><span class="p">(</span><span class="nl">mvar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">StgMVarTSOQueue_link</span><span class="p">(</span><span class="nl">q</span><span class="p">);</span></span>
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1901
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<pre style="margin: 0;">-<span id="LC1901" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">StgMVar_head</span><span class="p">(</span><span class="nl">mvar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">stg_END_TSO_QUEUE_closure</span><span class="p">)</span> <span class="p">{</span></span>
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1905
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<pre style="margin: 0;">+<span id="LC1905" class="line" lang="ghc-cmm"> <span class="nl">q</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">StgMVarTSOQueue_link</span><span class="p">(</span><span class="nl">q</span><span class="p">);</span></span>
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1906
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<pre style="margin: 0;">+<span id="LC1906" class="line" lang="ghc-cmm"> <span class="nf" style="color: #900; font-weight: 600;">StgMVar_head</span><span class="p">(</span><span class="nl">mvar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="nl">q</span><span class="p">;</span></span>
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1907
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<pre style="margin: 0;">+<span id="LC1907" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="nl">q</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">stg_END_TSO_QUEUE_closure</span><span class="p">)</span> <span class="p">{</span></span>
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1902
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1908
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<pre style="margin: 0;"> <span id="LC1908" class="line" lang="ghc-cmm"> <span class="nf" style="color: #900; font-weight: 600;">StgMVar_tail</span><span class="p">(</span><span class="nl">mvar</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="nl">stg_END_TSO_QUEUE_closure</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC1909" class="line" lang="ghc-cmm"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="p">{</span></span>
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1910
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<pre style="margin: 0;">+<span id="LC1910" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="nl">info</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">stg_MVAR_CLEAN_info</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1911" 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">
1911
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<pre style="margin: 0;">+<span id="LC1911" class="line" lang="ghc-cmm"> <span class="c1" style="color: #998; font-style: italic;">// Resolve #18919.</span></span>
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1912
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<pre style="margin: 0;">+<span id="LC1912" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">ccall</span> <span class="nf" style="color: #900; font-weight: 600;">dirty_MVAR</span><span class="p">(</span><span class="vg" style="color: #008080;">BaseReg</span> <span class="dl">"</span><span class="s" style="color: #d14;">ptr</span><span class="dl">"</span><span class="p">,</span> <span class="nl">mvar</span> <span class="dl">"</span><span class="s" style="color: #d14;">ptr</span><span class="dl">"</span><span class="p">,</span></span>
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1913
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<pre style="margin: 0;">+<span id="LC1913" class="line" lang="ghc-cmm"> <span class="nf" style="color: #900; font-weight: 600;">StgMVar_value</span><span class="p">(</span><span class="nl">mvar</span><span class="p">)</span> <span class="dl">"</span><span class="s" style="color: #d14;">ptr</span><span class="dl">"</span><span class="p">);</span></span>
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1914
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<pre style="margin: 0;">+<span id="LC1914" class="line" lang="ghc-cmm"> <span class="p">}</span></span>
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1903
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1915
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<pre style="margin: 0;"> <span id="LC1915" class="line" lang="ghc-cmm"> <span class="p">}</span></span>
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1904
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1916
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<pre style="margin: 0;"> <span id="LC1916" class="line" lang="ghc-cmm"></span>
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1905
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1917
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<pre style="margin: 0;"> <span id="LC1917" class="line" lang="ghc-cmm"> <span class="nf" style="color: #900; font-weight: 600;">ASSERT</span><span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">StgTSO_block_info</span><span class="p">(</span><span class="nl">tso</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">mvar</span><span class="p">);</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1924" 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="1936" 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">@@ -1924,10 +1936,8 @@ loop:</td>
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1924
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1936
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<pre style="margin: 0;"> <span id="LC1936" class="line" lang="ghc-cmm"></span>
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1925
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1937
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<pre style="margin: 0;"> <span id="LC1937" class="line" lang="ghc-cmm"> <span class="c1" style="color: #998; font-style: italic;">// If it was a readMVar, then we can still do work,</span></span>
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1926
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1938
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<pre style="margin: 0;"> <span id="LC1938" class="line" lang="ghc-cmm"> <span class="c1" style="color: #998; font-style: italic;">// so loop back. (XXX: This could take a while)</span></span>
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1927
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<pre style="margin: 0;">-<span id="LC1927" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="nl">why_blocked</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">BlockedOnMVarRead</span><span class="p">)</span> <span class="p">{</span></span>
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1928
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<pre style="margin: 0;">-<span id="LC1928" class="line" lang="ghc-cmm"> <span class="nl">q</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">StgMVarTSOQueue_link</span><span class="p">(</span><span class="nl">q</span><span class="p">);</span></span>
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1939
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<pre style="margin: 0;">+<span id="LC1939" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="nl">why_blocked</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">BlockedOnMVarRead</span><span class="p">)</span></span>
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1929
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1940
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<pre style="margin: 0;"> <span id="LC1940" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">goto</span> <span class="nl">loop</span><span class="p">;</span></span>
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1930
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<pre style="margin: 0;">-<span id="LC1930" class="line" lang="ghc-cmm"> <span class="p">}</span></span>
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1931
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1941
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<pre style="margin: 0;"> <span id="LC1941" class="line" lang="ghc-cmm"></span>
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1932
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1942
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<pre style="margin: 0;"> <span id="LC1942" class="line" lang="ghc-cmm"> <span class="nf" style="color: #900; font-weight: 600;">ASSERT</span><span class="p">(</span><span class="nl">why_blocked</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">BlockedOnMVar</span><span class="p">);</span></span>
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1933
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1943
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<pre style="margin: 0;"> <span id="LC1943" class="line" lang="ghc-cmm"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b944fd08884527c4fee7286ac60e0a9bd6ebf424#a5d219117032120cc7bde9f13451d9627cff5614"><strong>rts/Threads.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">@@ -803,9 +803,14 @@ loop:</td>
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803
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<pre style="margin: 0;"> <span id="LC803" class="line" lang="c"></span>
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804
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<pre style="margin: 0;"> <span id="LC804" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// There are takeMVar(s) waiting: wake up the first one</span></span>
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<pre style="margin: 0;"> <span id="LC805" class="line" lang="c"> <span class="n" style="color: #333;">tso</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">q</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">tso</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC806" class="line" lang="c"> <span class="n" style="color: #333;">mvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">head</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">q</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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807
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<pre style="margin: 0;">-<span id="LC807" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">mvar</span></span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="n" style="color: #333;"><span class="idiff right">head</span></span> <span class="o" style="font-weight: 600;">==</span> <span class="p">(</span><span class="n" style="color: #333;">StgMVarTSOQueue</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_END_TSO_QUEUE_closure</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC806" class="line" lang="c"> <span class="n" style="color: #333;">mvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">head</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">q</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">q</span></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="LC807" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">q</span></span> <span class="o" style="font-weight: 600;">==</span> <span class="p">(</span><span class="n" style="color: #333;">StgMVarTSOQueue</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_END_TSO_QUEUE_closure</span><span class="p">)</span> <span class="p">{</span></span>
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808
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="c"> <span class="n" style="color: #333;">mvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">tail</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">StgMVarTSOQueue</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_END_TSO_QUEUE_closure</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC809" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC810" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</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_MVAR_CLEAN_info</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC811" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Resolve #18919.</span></span>
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<pre style="margin: 0;">+<span id="LC812" class="line" lang="c"> <span class="n" style="color: #333;">dirty_MVAR</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">r</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;">mvar</span><span class="p">,</span> <span class="n" style="color: #333;">mvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">value</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC813" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC815" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC816" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">tso</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">block_info</span><span class="p">.</span><span class="n" style="color: #333;">closure</span> <span class="o" style="font-weight: 600;">==</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;">mvar</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">@@ -829,10 +834,8 @@ loop:</td>
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC835" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// If it was a readMVar, then we can still do work,</span></span>
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831
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836
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// so loop back. (XXX: This could take a while)</span></span>
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832
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<pre style="margin: 0;">-<span id="LC832" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">why_blocked</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">BlockedOnMVarRead</span><span class="p">)</span> <span class="p">{</span></span>
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833
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<pre style="margin: 0;">-<span id="LC833" class="line" lang="c"> <span class="n" style="color: #333;">q</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">((</span><span class="n" style="color: #333;">StgMVarTSOQueue</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">q</span><span class="p">)</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="LC837" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">why_blocked</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">BlockedOnMVarRead</span><span class="p">)</span></span>
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838
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="c"> <span class="k" style="font-weight: 600;">goto</span> <span class="n" style="color: #333;">loop</span><span class="p">;</span></span>
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835
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<pre style="margin: 0;">-<span id="LC835" class="line" lang="c"> <span class="p">}</span></span>
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836
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839
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="c"></span>
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840
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="c"> <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">why_blocked</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">BlockedOnMVar</span><span class="p">);</span></span>
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838
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841
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="c"></span>
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