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<h3>
Andreas Klebinger pushed to branch wip/andreask/allocCounter_docs
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/6e27a72ddd395c927d2724a246de67046a0046e3">6e27a72d</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-06-07T12:26:57+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update `setAllocationCounter` docs.

Unlike the old docs implied the counter might not be initialized to
zero. This was in particular true when executed in an interpreted
context. See #16012.

I changed to docs to make no guarantees about specific initialization
values which fixes #16012.
</pre>
</li>
</ul>
<h4>1 changed file:</h4>
<ul>
<li class="file-stats">
<a href="#484e50173b324b5842d294580ec9ed8a7b0d5d38">
libraries/base/GHC/Conc/Sync.hs
</a>
</li>
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<h4>Changes:</h4>
<li id="484e50173b324b5842d294580ec9ed8a7b0d5d38">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e27a72ddd395c927d2724a246de67046a0046e3#484e50173b324b5842d294580ec9ed8a7b0d5d38"><strong>libraries/base/GHC/Conc/Sync.hs</strong></a>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">_</span>  <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">GT</span></span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"><span class="cd">-- | Every thread has an allocation counter that tracks how much</span></span>
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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- memory has been allocated by the thread.  The counter is</span></span>
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<pre style="margin: 0;">-<span id="LC177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- initialized to zero, and 'setAllocationCounter' sets the current</span></span>
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<pre style="margin: 0;">-<span id="LC178" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- value.  The allocation counter counts *down*, so in the absence of</span></span>
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<pre style="margin: 0;">-<span id="LC179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a call to 'setAllocationCounter' its value is the negation of the</span></span>
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- number of bytes of memory allocated by the thread.</span></span>
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- memory has been allocated by the thread. The counter might be</span></span>
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- initialized with an arbitrary value >= 0 by GHC.</span></span>
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'setAllocationCounter' sets the current value.</span></span>
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The allocation counter counts *down*.</span></span>
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If initialized to zero a call to 'setAllocationCounter' reports</span></span>
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the negation of the number of bytes of memory allocated by the thread.</span></span>
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC183" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- There are two things that you can do with this counter:</span></span>
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</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">@@ -186,7 +187,9 @@ instance Ord ThreadId where</td>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Use it as a resource limit.  See 'enableAllocationLimit'.</span></span>
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="diff-line-num new_line old" data-linenumber="190" 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="LC189" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Allocation accounting is accurate only to about 4Kbytes.</span></span>
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Allocation accounting is accurate only to about 4Kbytes. Without</span></span>
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<td class="diff-line-num new old_line" data-linenumber="190" 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="LC191" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- initialization results are only meaningful if compared to the results</span></span>
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- of other invocations on the same thread.</span></span>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @since 4.8.0.0</span></span>
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="haskell"><span class="n" style="color: #333;">setAllocationCounter</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int64</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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