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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/ab334262a605b0ebc228096d8af88a55aa5ea6b8">ab334262</a></strong>
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<span>by Viktor Dukhovni</span>
<i>at 2020-11-30T19:48:17-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">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
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<h4>2 changed files:</h4>
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<li class="file-stats">
<a href="#6db965f97cbab901f493506a385bcf1283009921">
rts/PrimOps.cmm
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<li class="file-stats">
<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/ab334262a605b0ebc228096d8af88a55aa5ea6b8#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">@@ -1827,9 +1827,16 @@ loop:</td>
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<pre style="margin: 0;"> <span id="LC1827" 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="LC1828" class="line" lang="ghc-cmm"></span>
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<pre style="margin: 0;"> <span id="LC1829" 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="LC1830" 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="LC1831" 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="LC1830" 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="LC1831" 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="LC1832" 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="LC1833" 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="LC1834" 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="LC1835" 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="LC1836" 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="LC1837" 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="LC1838" 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="LC1839" class="line" lang="ghc-cmm"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1840" class="line" lang="ghc-cmm"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1841" class="line" lang="ghc-cmm"></span>
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<pre style="margin: 0;"> <span id="LC1842" 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">@@ -1854,10 +1861,8 @@ loop:</td>
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1861
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<pre style="margin: 0;"> <span id="LC1861" class="line" lang="ghc-cmm"></span>
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1855
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1862
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<pre style="margin: 0;"> <span id="LC1862" 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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1856
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1863
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<pre style="margin: 0;"> <span id="LC1863" 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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1857
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<pre style="margin: 0;">-<span id="LC1857" 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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1858
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<pre style="margin: 0;">-<span id="LC1858" 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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1864
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<pre style="margin: 0;">+<span id="LC1864" 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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1859
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1865
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<pre style="margin: 0;"> <span id="LC1865" 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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1860
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<pre style="margin: 0;">-<span id="LC1860" class="line" lang="ghc-cmm"> <span class="p">}</span></span>
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1861
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1866
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<pre style="margin: 0;"> <span id="LC1866" class="line" lang="ghc-cmm"></span>
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1862
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1867
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<pre style="margin: 0;"> <span id="LC1867" 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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1863
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1868
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<pre style="margin: 0;"> <span id="LC1868" class="line" lang="ghc-cmm"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1917" 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">@@ -1912,9 +1917,16 @@ loop:</td>
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1912
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1917
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<pre style="margin: 0;"> <span id="LC1917" 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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1913
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1918
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<pre style="margin: 0;"> <span id="LC1918" class="line" lang="ghc-cmm"></span>
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1914
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1919
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<pre style="margin: 0;"> <span id="LC1919" 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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1915
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<pre style="margin: 0;">-<span id="LC1915" 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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1916
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<pre style="margin: 0;">-<span id="LC1916" 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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1920
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<pre style="margin: 0;">+<span id="LC1920" 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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1921
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<pre style="margin: 0;">+<span id="LC1921" 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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1922
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<pre style="margin: 0;">+<span id="LC1922" 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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1917
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1923
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<pre style="margin: 0;"> <span id="LC1923" 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="LC1924" 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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1925
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<pre style="margin: 0;">+<span id="LC1925" 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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1926
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<pre style="margin: 0;">+<span id="LC1926" class="line" lang="ghc-cmm"> <span class="c1" style="color: #998; font-style: italic;">// Resolve #18919.</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;">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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1928
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<pre style="margin: 0;">+<span id="LC1928" 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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1929
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<pre style="margin: 0;">+<span id="LC1929" class="line" lang="ghc-cmm"> <span class="p">}</span></span>
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1918
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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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1919
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1931
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<pre style="margin: 0;"> <span id="LC1931" class="line" lang="ghc-cmm"></span>
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1920
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1932
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<pre style="margin: 0;"> <span id="LC1932" 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="1939" 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="1951" 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">@@ -1939,10 +1951,8 @@ loop:</td>
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1939
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1951
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<pre style="margin: 0;"> <span id="LC1951" class="line" lang="ghc-cmm"></span>
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1940
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1952
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<pre style="margin: 0;"> <span id="LC1952" 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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1941
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1953
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<pre style="margin: 0;"> <span id="LC1953" 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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1942
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<pre style="margin: 0;">-<span id="LC1942" 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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1943
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<pre style="margin: 0;">-<span id="LC1943" 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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1954
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<pre style="margin: 0;">+<span id="LC1954" 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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1944
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1955
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<pre style="margin: 0;"> <span id="LC1955" 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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1945
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<pre style="margin: 0;">-<span id="LC1945" class="line" lang="ghc-cmm"> <span class="p">}</span></span>
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1946
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1956
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<pre style="margin: 0;"> <span id="LC1956" class="line" lang="ghc-cmm"></span>
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1947
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1957
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<pre style="margin: 0;"> <span id="LC1957" 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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1948
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1958
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<pre style="margin: 0;"> <span id="LC1958" class="line" lang="ghc-cmm"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ab334262a605b0ebc228096d8af88a55aa5ea6b8#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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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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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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