1 /* Copyright (C) 2005 Free Software Foundation, Inc. 2 Contributed by Richard Henderson <rth@redhat.com>. 3 4 This file is part of the GNU OpenMP Library (libgomp). 5 6 Libgomp is free software; you can redistribute it and/or modify it 7 under the terms of the GNU Lesser General Public License as published by 8 the Free Software Foundation; either version 2.1 of the License, or 9 (at your option) any later version. 10 11 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 13 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for 14 more details. 15 16 You should have received a copy of the GNU Lesser General Public License 17 along with libgomp; see the file COPYING.LIB. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21 /* As a special exception, if you link this library with other files, some 22 of which are compiled with GCC, to produce an executable, this library 23 does not by itself cause the resulting executable to be covered by the 24 GNU General Public License. This exception does not however invalidate 25 any other reasons why the executable file might be covered by the GNU 26 General Public License. */ 27 28 /* This is the default PTHREADS implementation of the public OpenMP 29 locking primitives. 30 31 Because OpenMP uses different entry points for normal and recursive 32 locks, and pthreads uses only one entry point, a system may be able 33 to do better and streamline the locking as well as reduce the size 34 of the types exported. */ 35 36 /* We need Unix98 extensions to get recursive locks. On Tru64 UNIX V4.0F, 37 the declarations are available without _XOPEN_SOURCE, which actually 38 breaks compilation. */ 39 #ifndef __osf__ 40 #define _XOPEN_SOURCE 500 41 #endif 42 43 #include "libgomp.h" 44 45 46 void 47 omp_init_lock (omp_lock_t *lock) 48 { 49 pthread_mutex_init (lock, NULL); 50 } 51 52 void 53 omp_destroy_lock (omp_lock_t *lock) 54 { 55 pthread_mutex_destroy (lock); 56 } 57 58 void 59 omp_set_lock (omp_lock_t *lock) 60 { 61 pthread_mutex_lock (lock); 62 } 63 64 void 65 omp_unset_lock (omp_lock_t *lock) 66 { 67 pthread_mutex_unlock (lock); 68 } 69 70 int 71 omp_test_lock (omp_lock_t *lock) 72 { 73 return pthread_mutex_trylock (lock) == 0; 74 } 75 76 void 77 omp_init_nest_lock (omp_nest_lock_t *lock) 78 { 79 pthread_mutexattr_t attr; 80 81 pthread_mutexattr_init (&attr); 82 pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE); 83 pthread_mutex_init (&lock->lock, &attr); 84 lock->count = 0; 85 pthread_mutexattr_destroy (&attr); 86 } 87 88 void 89 omp_destroy_nest_lock (omp_nest_lock_t *lock) 90 { 91 pthread_mutex_destroy (&lock->lock); 92 } 93 94 void 95 omp_set_nest_lock (omp_nest_lock_t *lock) 96 { 97 pthread_mutex_lock (&lock->lock); 98 lock->count++; 99 } 100 101 void 102 omp_unset_nest_lock (omp_nest_lock_t *lock) 103 { 104 lock->count--; 105 pthread_mutex_unlock (&lock->lock); 106 } 107 108 int 109 omp_test_nest_lock (omp_nest_lock_t *lock) 110 { 111 if (pthread_mutex_trylock (&lock->lock) == 0) 112 return ++lock->count; 113 return 0; 114 } 115 116 ialias (omp_init_lock) 117 ialias (omp_init_nest_lock) 118 ialias (omp_destroy_lock) 119 ialias (omp_destroy_nest_lock) 120 ialias (omp_set_lock) 121 ialias (omp_set_nest_lock) 122 ialias (omp_unset_lock) 123 ialias (omp_unset_nest_lock) 124 ialias (omp_test_lock) 125 ialias (omp_test_nest_lock) 126