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| author | Samuel Thibault <samy@hurd.youpi.perso.aquilenet.fr> | 2012-05-20 13:37:32 +0000 |
|---|---|---|
| committer | Samuel Thibault <samy@hurd.youpi.perso.aquilenet.fr> | 2012-05-20 13:37:32 +0000 |
| commit | ca35f7a6e428a95d1ff0aa40d6545820b580df1d (patch) | |
| tree | 27027c7aabca1f4bbe7fb684e4f0f1a7d3b24051 /libpthread/sysdeps/generic/pt-mutex-trylock.c | |
| parent | c490cb9d4c1df1adcb2e76679e1969e7fe062560 (diff) | |
| parent | 756a64304b61a94b9b57ae88c4af5654152f5b8e (diff) | |
Merge branch 'upstream-merged'
Diffstat (limited to 'libpthread/sysdeps/generic/pt-mutex-trylock.c')
| -rw-r--r-- | libpthread/sysdeps/generic/pt-mutex-trylock.c | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/libpthread/sysdeps/generic/pt-mutex-trylock.c b/libpthread/sysdeps/generic/pt-mutex-trylock.c deleted file mode 100644 index 7a54cc9a..00000000 --- a/libpthread/sysdeps/generic/pt-mutex-trylock.c +++ /dev/null @@ -1,112 +0,0 @@ -/* Try to Lock a mutex. Generic version. - Copyright (C) 2002, 2005, 2008 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#include <pthread.h> - -#include <pt-internal.h> - -#define LOSE do { * (int *) 0 = 0; } while (1) - -/* Lock MUTEX, return EBUSY if we can't get it. */ -int -__pthread_mutex_trylock (struct __pthread_mutex *mutex) -{ - int err; - struct __pthread *self; - const struct __pthread_mutexattr *attr = mutex->attr; - - if (attr == __PTHREAD_ERRORCHECK_MUTEXATTR) - attr = &__pthread_errorcheck_mutexattr; - if (attr == __PTHREAD_RECURSIVE_MUTEXATTR) - attr = &__pthread_recursive_mutexattr; - - __pthread_spin_lock (&mutex->__lock); - if (__pthread_spin_trylock (&mutex->__held) == 0) - /* Acquired the lock. */ - { -#if defined(ALWAYS_TRACK_MUTEX_OWNER) -#ifndef NDEBUG - self = _pthread_self (); - if (self) - /* The main thread may take a lock before the library is fully - initialized, in particular, before the main thread has a - TCB. */ - { - assert (! mutex->owner); - mutex->owner = _pthread_self (); - } -#endif -#endif - - if (attr) - switch (attr->mutex_type) - { - case PTHREAD_MUTEX_NORMAL: - break; - - case PTHREAD_MUTEX_RECURSIVE: - mutex->locks = 1; - case PTHREAD_MUTEX_ERRORCHECK: - mutex->owner = _pthread_self (); - break; - - default: - LOSE; - } - - __pthread_spin_unlock (&mutex->__lock); - return 0; - } - - err = EBUSY; - - if (attr) - { - self = _pthread_self (); - switch (attr->mutex_type) - { - case PTHREAD_MUTEX_NORMAL: - break; - - case PTHREAD_MUTEX_ERRORCHECK: - /* We could check if MUTEX->OWNER is SELF, however, POSIX - does not permit pthread_mutex_trylock to return EDEADLK - instead of EBUSY, only pthread_mutex_lock. */ - break; - - case PTHREAD_MUTEX_RECURSIVE: - if (mutex->owner == self) - { - mutex->locks ++; - err = 0; - } - break; - - default: - LOSE; - } - } - - __pthread_spin_unlock (&mutex->__lock); - - return err; -} - -strong_alias (__pthread_mutex_trylock, _pthread_mutex_trylock); -strong_alias (__pthread_mutex_trylock, pthread_mutex_trylock); |
