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commit 49186d21ef2d87986bccaf0a7c45c48c91b265f3
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Author: Andi Kleen <ak@linux.intel.com>
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Date: Thu Jun 27 11:15:06 2013 -0700
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Disable elision for any pthread_mutexattr_settype call
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PTHREAD_MUTEX_NORMAL requires deadlock for nesting, DEFAULT
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does not. Since glibc uses the same value (0) disable elision
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for any call to pthread_mutexattr_settype() with a 0 value.
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This implies that a program can disable elision by doing
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_NORMAL)
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Based on a original proposal by Rich Felker.
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Index: glibc-2.17-c758a686/nptl/pthread_mutexattr_settype.c
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===================================================================
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--- glibc-2.17-c758a686.orig/nptl/pthread_mutexattr_settype.c
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+++ glibc-2.17-c758a686/nptl/pthread_mutexattr_settype.c
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@@ -30,6 +30,11 @@ __pthread_mutexattr_settype (attr, kind)
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if (kind < PTHREAD_MUTEX_NORMAL || kind > PTHREAD_MUTEX_ADAPTIVE_NP)
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return EINVAL;
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+ /* Cannot distinguish between DEFAULT and NORMAL. So any settype
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+ call disables elision for now. */
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+ if (kind == PTHREAD_MUTEX_DEFAULT)
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+ kind |= PTHREAD_MUTEX_NO_ELISION_NP;
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+
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iattr = (struct pthread_mutexattr *) attr;
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iattr->mutexkind = (iattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_BITS) | kind;
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