source: trunk/sys/libgomp/include/gomp/ptrlock.h @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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1/* Copyright (C) 2008, 2009 Free Software Foundation, Inc.
2   Contributed by Jakub Jelinek <jakub@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 General Public License as published by
8   the Free Software Foundation; either version 3, or (at your option)
9   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 General Public License for
14   more details.
15
16   Under Section 7 of GPL version 3, you are granted additional
17   permissions described in the GCC Runtime Library Exception, version
18   3.1, as published by the Free Software Foundation.
19
20   You should have received a copy of the GNU General Public License and
21   a copy of the GCC Runtime Library Exception along with this program;
22   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23   <http://www.gnu.org/licenses/>.  */
24
25/* This is a Linux specific implementation of a mutex synchronization
26   mechanism for libgomp.  This type is private to the library.  This
27   implementation uses atomic instructions and the futex syscall.  */
28
29#ifndef GOMP_PTRLOCK_H
30#define GOMP_PTRLOCK_H 1
31
32typedef struct { void *ptr; gomp_mutex_t lock; } gomp_ptrlock_t;
33
34static inline void gomp_ptrlock_init (gomp_ptrlock_t *ptrlock, void *ptr)
35{
36  ptrlock->ptr = ptr;
37  gomp_mutex_init (&ptrlock->lock);
38}
39
40static inline void *gomp_ptrlock_get (gomp_ptrlock_t *ptrlock)
41{
42  if (ptrlock->ptr != NULL)
43    return ptrlock->ptr;
44
45  gomp_mutex_lock (&ptrlock->lock);
46  if (ptrlock->ptr != NULL)
47    {
48      gomp_mutex_unlock (&ptrlock->lock);
49      return ptrlock->ptr;
50    }
51
52  return NULL;
53}
54
55static inline void gomp_ptrlock_set (gomp_ptrlock_t *ptrlock, void *ptr)
56{
57  ptrlock->ptr = ptr;
58  gomp_mutex_unlock (&ptrlock->lock);
59}
60
61static inline void gomp_ptrlock_destroy (gomp_ptrlock_t *ptrlock)
62{
63  gomp_mutex_destroy (&ptrlock->lock);
64}
65
66#endif /* GOMP_PTRLOCK_H */
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