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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Dynamic loading/unloading of opengl32.dll results in a deadlock"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76252">76252</a>
</td>
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>Dynamic loading/unloading of opengl32.dll results in a deadlock
</td>
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<th>Severity</th>
<td>major
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>cgerlach42@gmail.com
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Version</th>
<td>10.1
</td>
</tr>
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<th>Component</th>
<td>Mesa core
</td>
</tr>
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<th>Product</th>
<td>Mesa
</td>
</tr></table>
<p>
<div>
<pre>I'm using llvmpipe for software rendering under windows. To switch easily
between hardware and software rendering I loaded the opengl32.dll dynamically.
Unloading the hardware OpenGL library works fine, but unloading mesa results in
a deadlock.
Stacktrace:
opengl32.dll!lp_rast_destroy(lp_rasterizer * rast) Line 948 C
opengl32.dll!llvmpipe_destroy_screen(pipe_screen * _screen) Line 439 C
opengl32.dll!stw_cleanup() Line 180 C
opengl32.dll!DllMain(HINSTANCE__ * hinstDLL, unsigned long fdwReason, void *
lpReserved) Line 168 C
opengl32.dll!__DllMainCRTStartup(void * hDllHandle, unsigned long dwReason,
void * lpreserved) Line 508 C
ntdll.dll!LdrpUnloadDll () Unknown
ntdll.dll!LdrUnloadDll () Unknown
KernelBase.dll!FreeLibrary () Unknown
QtCore4.dll!QLibraryPrivate::unload_sys() Line 157 C++
QtCore4.dll!QLibraryPrivate::unload() Line 488 C++
Setting LP_NUM_THREADS=0 workarounds this problem.</pre>
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