diff options
Diffstat (limited to 'sysdeps/htl/pt-mutex-timedlock.c')
| -rw-r--r-- | sysdeps/htl/pt-mutex-timedlock.c | 197 |
1 files changed, 0 insertions, 197 deletions
diff --git a/sysdeps/htl/pt-mutex-timedlock.c b/sysdeps/htl/pt-mutex-timedlock.c deleted file mode 100644 index 0e50f38ef2..0000000000 --- a/sysdeps/htl/pt-mutex-timedlock.c +++ /dev/null @@ -1,197 +0,0 @@ -/* Lock a mutex with a timeout. Generic version. - Copyright (C) 2000-2020 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 Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <https://www.gnu.org/licenses/>. */ - -#include <pthread.h> -#include <assert.h> -#include <time.h> - -#include <pt-internal.h> - -#define LOSE do { * (int *) 0 = 0; } while (1) - -/* Try to lock MUTEX, block until *ABSTIME if it is already held. As - a GNU extension, if TIMESPEC is NULL then wait forever. */ -int -__pthread_mutex_timedlock_internal (struct __pthread_mutex *mutex, - const struct timespec *abstime) -{ - error_t err; - int drain; - 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) - /* Successfully acquired the lock. */ - { -#ifdef ALWAYS_TRACK_MUTEX_OWNER -# ifndef NDEBUG - self = _pthread_self (); - if (self != NULL) - /* 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 == NULL); - mutex->__owner = _pthread_self (); - } -# endif -#endif - - if (attr != NULL) - 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; - } - - /* The lock is busy. */ - - self = _pthread_self (); - assert (self); - - if (attr == NULL || attr->__mutex_type == PTHREAD_MUTEX_NORMAL) - { -#if defined(ALWAYS_TRACK_MUTEX_OWNER) - assert (mutex->__owner != self); -#endif - } - else - { - switch (attr->__mutex_type) - { - case PTHREAD_MUTEX_ERRORCHECK: - if (mutex->__owner == self) - { - __pthread_spin_unlock (&mutex->__lock); - return EDEADLK; - } - break; - - case PTHREAD_MUTEX_RECURSIVE: - if (mutex->__owner == self) - { - mutex->__locks++; - __pthread_spin_unlock (&mutex->__lock); - return 0; - } - break; - - default: - LOSE; - } - } - -#if !defined(ALWAYS_TRACK_MUTEX_OWNER) - if (attr != NULL && attr->__mutex_type != PTHREAD_MUTEX_NORMAL) -#endif - assert (mutex->__owner); - - if (abstime != NULL && ! valid_nanoseconds (abstime->tv_nsec)) - return EINVAL; - - /* Add ourselves to the queue. */ - __pthread_enqueue (&mutex->__queue, self); - __pthread_spin_unlock (&mutex->__lock); - - /* Block the thread. */ - if (abstime != NULL) - err = __pthread_timedblock (self, abstime, CLOCK_REALTIME); - else - { - err = 0; - __pthread_block (self); - } - - __pthread_spin_lock (&mutex->__lock); - if (self->prevp == NULL) - /* Another thread removed us from the queue, which means a wakeup message - has been sent. It was either consumed while we were blocking, or - queued after we timed out and before we acquired the mutex lock, in - which case the message queue must be drained. */ - drain = err ? 1 : 0; - else - { - /* We're still in the queue. Noone attempted to wake us up, i.e. we - timed out. */ - __pthread_dequeue (self); - drain = 0; - } - __pthread_spin_unlock (&mutex->__lock); - - if (drain) - __pthread_block (self); - - if (err) - { - assert (err == ETIMEDOUT); - return err; - } - -#if !defined(ALWAYS_TRACK_MUTEX_OWNER) - if (attr != NULL && attr->__mutex_type != PTHREAD_MUTEX_NORMAL) -#endif - { - assert (mutex->__owner == self); - } - - if (attr != NULL) - switch (attr->__mutex_type) - { - case PTHREAD_MUTEX_NORMAL: - break; - - case PTHREAD_MUTEX_RECURSIVE: - assert (mutex->__locks == 0); - mutex->__locks = 1; - case PTHREAD_MUTEX_ERRORCHECK: - mutex->__owner = self; - break; - - default: - LOSE; - } - - return 0; -} - -int -__pthread_mutex_timedlock (struct __pthread_mutex *mutex, - const struct timespec *abstime) -{ - return __pthread_mutex_timedlock_internal (mutex, abstime); -} -strong_alias (__pthread_mutex_timedlock, pthread_mutex_timedlock) |