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30 lines
1.2 KiB

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