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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-US;mso-fareast-language:EN-US">Hi Reid,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-US;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:EN-US;mso-fareast-language:EN-US">Thanks for the feedback. Could you elaborate on pinning
and dropping topic. I don’t quite understand what do you mean.<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span lang="EN-US" style="mso-ansi-language:EN-US;mso-fareast-language:EN-US"><o:p> </o:p></span></a></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-US" style="mso-ansi-language:EN-US;mso-fareast-language:EN-US">Thanks,<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-US" style="mso-ansi-language:EN-US;mso-fareast-language:EN-US">Alexey Sotkin<o:p></o:p></span></span></p>
<span style="mso-bookmark:_MailEndCompose"></span>
<p class="MsoNormal"><a name="_____replyseparator"></a><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-US">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-US">
Reid <span class="SpellE">Kleckner</span> [mailto:rnk@google.com] <br>
<b>Sent:</b> Monday, October 22, 2018 11:57 PM<br>
<b>To:</b> Sotkin, Alexey <alexey.sotkin@intel.com><br>
<b>Cc:</b> llvm-dev <llvm-dev@lists.llvm.org>; Maksimova, Viktoria <viktoria.maksimova@intel.com><br>
<b>Subject:</b> Re: [llvm-dev] [RFC] Free memory allocated for <span class="SpellE">
ManagedStaticMutex</span><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Let's not do this. It's really best for global mutexes to live for the entire process lifetime. Initializing them and deinitializing them just asks for races. Perhaps you can avoid this problem by pinning your LLVM DLL in memory by LoadLibrary'ing
it and dropping the reference.<o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal">On Mon, Oct 15, 2018 at 3:54 AM Sotkin, Alexey via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="mso-ansi-language:EN-US">Hi,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="mso-ansi-language:EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="mso-ansi-language:EN-US">In
<span class="SpellE"><span class="m5837773912688951461spelle">llvm_shutdown</span></span> function we destroy all objects in the
<span class="SpellE"><span class="m5837773912688951461spelle">StaticList</span></span>. This procedure as well as
<span class="SpellE"><span class="m5837773912688951461spelle">RegisterManagedStatic</span></span> are guarded by
<span class="SpellE"><span class="m5837773912688951461spelle">ManagedStaticMutex</span></span> which is a static pointer visible only in ManagedStatic.cpp. Memory for the
<span class="SpellE"><span class="m5837773912688951461spelle">mutex</span></span> is allocated at
<span class="SpellE"><span class="m5837773912688951461spelle">initializeMutex</span></span> function and we never free this memory. From my experience this can cause a memory leak problem if we create a
<span class="SpellE"><span class="m5837773912688951461spelle">dll</span></span> linked with LLVM libraries and the
<span class="SpellE"><span class="m5837773912688951461spelle">dll</span></span> gets loaded(<span class="SpellE"><span class="m5837773912688951461spelle">LoadLibrary</span></span> Windows API) and unload(<span class="SpellE"><span class="m5837773912688951461spelle">FreeLibrary</span></span>
Windows API) at runtime many times.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="mso-ansi-language:EN-US">My proposal is to provide
<span class="SpellE"><span class="m5837773912688951461spelle">deleteManagedStaticMutex</span></span> LLVM API, so we can deallocate the
<span class="SpellE"><span class="m5837773912688951461spelle">mutex</span></span> from
<span class="SpellE"><span class="m5837773912688951461spelle">DllMain</span></span> on Windows. Please take a look at
<a href="https://reviews.llvm.org/D52425" target="_blank">https://reviews.llvm.org/D52425</a>
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="mso-ansi-language:EN-US">I also think it’s worth adding
<span class="SpellE"><span class="m5837773912688951461spelle">deleteManagedStaticMutex</span></span> to
<span class="SpellE"><span class="m5837773912688951461spelle">llvm_shutdown_obj’s</span></span> destructor. I have attached
<span class="SpellE"><span class="m5837773912688951461spelle">valgrind</span></span> logs with and without deleting
<span class="SpellE"><span class="m5837773912688951461spelle">ManagedStaticMutex</span></span>.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="mso-ansi-language:EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><i><span lang="EN-US" style="mso-ansi-language:EN-US">Best regards.</span></i><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><i><span lang="EN-US" style="mso-ansi-language:EN-US">Alexey Sotkin.</span></i><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="mso-ansi-language:EN-US"> </span><o:p></o:p></p>
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