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commit b0a3c1640ab2fb7d16d9b9a8d9c0e524e9cb0001
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Author: Andreas Schwab <schwab@suse.de>
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Date: Tue Mar 4 13:00:26 2014 +0100
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Properly handle forced elision in pthread_mutex_trylock (bug 16657)
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Index: glibc-2.17-c758a686/nptl/pthread_mutex_trylock.c
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===================================================================
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--- glibc-2.17-c758a686.orig/nptl/pthread_mutex_trylock.c
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+++ glibc-2.17-c758a686/nptl/pthread_mutex_trylock.c
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@@ -26,8 +26,8 @@
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#define lll_trylock_elision(a,t) lll_trylock(a)
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#endif
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-#ifndef DO_ELISION
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-#define DO_ELISION(m) 0
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+#ifndef FORCE_ELISION
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+#define FORCE_ELISION(m, s)
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#endif
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/* We don't force elision in trylock, because this can lead to inconsistent
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@@ -69,7 +69,7 @@ __pthread_mutex_trylock (mutex)
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break;
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case PTHREAD_MUTEX_TIMED_ELISION_NP:
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- elision:
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+ elision: __attribute__((unused))
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if (lll_trylock_elision (mutex->__data.__lock,
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mutex->__data.__elision) != 0)
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break;
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@@ -77,8 +77,7 @@ __pthread_mutex_trylock (mutex)
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return 0;
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case PTHREAD_MUTEX_TIMED_NP:
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- if (DO_ELISION (mutex))
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- goto elision;
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+ FORCE_ELISION (mutex, goto elision);
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/*FALL THROUGH*/
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case PTHREAD_MUTEX_ADAPTIVE_NP:
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case PTHREAD_MUTEX_ERRORCHECK_NP:
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Index: glibc-2.17-c758a686/nptl/sysdeps/unix/sysv/linux/x86/force-elision.h
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===================================================================
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--- glibc-2.17-c758a686.orig/nptl/sysdeps/unix/sysv/linux/x86/force-elision.h
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+++ glibc-2.17-c758a686/nptl/sysdeps/unix/sysv/linux/x86/force-elision.h
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@@ -16,11 +16,6 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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-/* Check for elision on this lock without upgrading. */
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-#define DO_ELISION(m) \
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- (__pthread_force_elision \
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- && (m->__data.__kind & PTHREAD_MUTEX_NO_ELISION_NP) == 0) \
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-
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/* Automatically enable elision for existing user lock kinds. */
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#define FORCE_ELISION(m, s) \
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if (__pthread_force_elision \
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