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
46void
47omp_init_lock (omp_lock_t *lock)
48{
49  pthread_mutex_init (lock, NULL);
50}
51
52void
53omp_destroy_lock (omp_lock_t *lock)
54{
55  pthread_mutex_destroy (lock);
56}
57
58void
59omp_set_lock (omp_lock_t *lock)
60{
61  pthread_mutex_lock (lock);
62}
63
64void
65omp_unset_lock (omp_lock_t *lock)
66{
67  pthread_mutex_unlock (lock);
68}
69
70int
71omp_test_lock (omp_lock_t *lock)
72{
73  return pthread_mutex_trylock (lock) == 0;
74}
75
76void
77omp_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
88void
89omp_destroy_nest_lock (omp_nest_lock_t *lock)
90{
91  pthread_mutex_destroy (&lock->lock);
92}
93
94void
95omp_set_nest_lock (omp_nest_lock_t *lock)
96{
97  pthread_mutex_lock (&lock->lock);
98  lock->count++;
99}
100
101void
102omp_unset_nest_lock (omp_nest_lock_t *lock)
103{
104  lock->count--;
105  pthread_mutex_unlock (&lock->lock);
106}
107
108int
109omp_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
116ialias (omp_init_lock)
117ialias (omp_init_nest_lock)
118ialias (omp_destroy_lock)
119ialias (omp_destroy_nest_lock)
120ialias (omp_set_lock)
121ialias (omp_set_nest_lock)
122ialias (omp_unset_lock)
123ialias (omp_unset_nest_lock)
124ialias (omp_test_lock)
125ialias (omp_test_nest_lock)
126