OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [libgomp/] [config/] [posix/] [sem.c] - Blame information for rev 867

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 38 julius
/* Copyright (C) 2005, 2006 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 POSIX 1003.1b implementation of a semaphore
29
   synchronization mechanism for libgomp.  This type is private to
30
   the library.
31
 
32
   This is a bit heavy weight for what we need, in that we're not
33
   interested in sem_wait as a cancelation point, but it's not too
34
   bad for a default.  */
35
 
36
#include "libgomp.h"
37
 
38
#ifdef HAVE_BROKEN_POSIX_SEMAPHORES
39
#include <stdlib.h>
40
 
41
void gomp_sem_init (gomp_sem_t *sem, int value)
42
{
43
  int ret;
44
 
45
  ret = pthread_mutex_init (&sem->mutex, NULL);
46
  if (ret)
47
    return;
48
 
49
  ret = pthread_cond_init (&sem->cond, NULL);
50
  if (ret)
51
    return;
52
 
53
  sem->value = value;
54
}
55
 
56
void gomp_sem_wait (gomp_sem_t *sem)
57
{
58
  int ret;
59
 
60
  ret = pthread_mutex_lock (&sem->mutex);
61
  if (ret)
62
    return;
63
 
64
  if (sem->value > 0)
65
    {
66
      sem->value--;
67
      ret = pthread_mutex_unlock (&sem->mutex);
68
      return;
69
    }
70
 
71
  while (sem->value <= 0)
72
    {
73
      ret = pthread_cond_wait (&sem->cond, &sem->mutex);
74
      if (ret)
75
        {
76
          pthread_mutex_unlock (&sem->mutex);
77
          return;
78
        }
79
    }
80
 
81
  sem->value--;
82
  ret = pthread_mutex_unlock (&sem->mutex);
83
  return;
84
}
85
 
86
void gomp_sem_post (gomp_sem_t *sem)
87
{
88
  int ret;
89
 
90
  ret = pthread_mutex_lock (&sem->mutex);
91
  if (ret)
92
    return;
93
 
94
  sem->value++;
95
 
96
  ret = pthread_mutex_unlock (&sem->mutex);
97
  if (ret)
98
    return;
99
 
100
  ret = pthread_cond_signal (&sem->cond);
101
 
102
  return;
103
}
104
 
105
void gomp_sem_destroy (gomp_sem_t *sem)
106
{
107
  int ret;
108
 
109
  ret = pthread_mutex_destroy (&sem->mutex);
110
  if (ret)
111
    return;
112
 
113
  ret = pthread_cond_destroy (&sem->cond);
114
 
115
  return;
116
}
117
#else /* HAVE_BROKEN_POSIX_SEMAPHORES  */
118
void
119
gomp_sem_wait (gomp_sem_t *sem)
120
{
121
  /* With POSIX, the wait can be canceled by signals.  We don't want that.
122
     It is expected that the return value here is -1 and errno is EINTR.  */
123
  while (sem_wait (sem) != 0)
124
    continue;
125
}
126
#endif

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.