| /* Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is part of the GNU OpenMP Library (libgomp). |
| |
| Libgomp 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. |
| |
| Libgomp 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 libgomp; see the file COPYING.LIB. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| MA 02110-1301, USA. */ |
| |
| /* As a special exception, if you link this library with other files, some |
| of which are compiled with GCC, to produce an executable, this library |
| does not by itself cause the resulting executable to be covered by the |
| GNU General Public License. This exception does not however invalidate |
| any other reasons why the executable file might be covered by the GNU |
| General Public License. */ |
| |
| /* This is the POSIX95 implementation of the public OpenMP locking primitives. |
| |
| Because OpenMP uses different entry points for normal and recursive |
| locks, and pthreads uses only one entry point, a system may be able |
| to do better and streamline the locking as well as reduce the size |
| of the types exported. */ |
| |
| #include "libgomp.h" |
| |
| |
| void |
| omp_init_lock (omp_lock_t *lock) |
| { |
| pthread_mutex_init (lock, NULL); |
| } |
| |
| void |
| omp_destroy_lock (omp_lock_t *lock) |
| { |
| pthread_mutex_destroy (lock); |
| } |
| |
| void |
| omp_set_lock (omp_lock_t *lock) |
| { |
| pthread_mutex_lock (lock); |
| } |
| |
| void |
| omp_unset_lock (omp_lock_t *lock) |
| { |
| pthread_mutex_unlock (lock); |
| } |
| |
| int |
| omp_test_lock (omp_lock_t *lock) |
| { |
| return pthread_mutex_trylock (lock) == 0; |
| } |
| |
| void |
| omp_init_nest_lock (omp_nest_lock_t *lock) |
| { |
| pthread_mutex_init (&lock->lock, NULL); |
| lock->owner = (pthread_t) 0; |
| lock->count = 0; |
| } |
| |
| void |
| omp_destroy_nest_lock (omp_nest_lock_t *lock) |
| { |
| pthread_mutex_destroy (&lock->lock); |
| } |
| |
| void |
| omp_set_nest_lock (omp_nest_lock_t *lock) |
| { |
| pthread_t me = pthread_self (); |
| |
| if (lock->owner != me) |
| { |
| pthread_mutex_lock (&lock->lock); |
| lock->owner = me; |
| } |
| |
| lock->count++; |
| } |
| |
| void |
| omp_unset_nest_lock (omp_nest_lock_t *lock) |
| { |
| lock->count--; |
| |
| if (lock->count == 0) |
| { |
| lock->owner = (pthread_t) 0; |
| pthread_mutex_unlock (&lock->lock); |
| } |
| } |
| |
| int |
| omp_test_nest_lock (omp_nest_lock_t *lock) |
| { |
| pthread_t me = pthread_self (); |
| |
| if (lock->owner != me) |
| { |
| if (pthread_mutex_trylock (&lock->lock) != 0) |
| return 0; |
| lock->owner = me; |
| } |
| |
| return ++lock->count; |
| } |
| |
| ialias (omp_init_lock) |
| ialias (omp_init_nest_lock) |
| ialias (omp_destroy_lock) |
| ialias (omp_destroy_nest_lock) |
| ialias (omp_set_lock) |
| ialias (omp_set_nest_lock) |
| ialias (omp_unset_lock) |
| ialias (omp_unset_nest_lock) |
| ialias (omp_test_lock) |
| ialias (omp_test_nest_lock) |