1 |
38 |
julius |
/* 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 a Linux specific implementation of a mutex synchronization
|
29 |
|
|
mechanism for libgomp. This type is private to the library. This
|
30 |
|
|
implementation uses atomic instructions and the futex syscall. */
|
31 |
|
|
|
32 |
|
|
#ifndef GOMP_MUTEX_H
|
33 |
|
|
#define GOMP_MUTEX_H 1
|
34 |
|
|
|
35 |
|
|
typedef int gomp_mutex_t;
|
36 |
|
|
|
37 |
|
|
#define GOMP_MUTEX_INIT_0 1
|
38 |
|
|
|
39 |
|
|
static inline void gomp_mutex_init (gomp_mutex_t *mutex)
|
40 |
|
|
{
|
41 |
|
|
*mutex = 0;
|
42 |
|
|
}
|
43 |
|
|
|
44 |
|
|
extern void gomp_mutex_lock_slow (gomp_mutex_t *mutex);
|
45 |
|
|
static inline void gomp_mutex_lock (gomp_mutex_t *mutex)
|
46 |
|
|
{
|
47 |
|
|
if (!__sync_bool_compare_and_swap (mutex, 0, 1))
|
48 |
|
|
gomp_mutex_lock_slow (mutex);
|
49 |
|
|
}
|
50 |
|
|
|
51 |
|
|
extern void gomp_mutex_unlock_slow (gomp_mutex_t *mutex);
|
52 |
|
|
static inline void gomp_mutex_unlock (gomp_mutex_t *mutex)
|
53 |
|
|
{
|
54 |
|
|
int val = __sync_lock_test_and_set (mutex, 0);
|
55 |
|
|
if (__builtin_expect (val > 1, 0))
|
56 |
|
|
gomp_mutex_unlock_slow (mutex);
|
57 |
|
|
}
|
58 |
|
|
|
59 |
|
|
static inline void gomp_mutex_destroy (gomp_mutex_t *mutex)
|
60 |
|
|
{
|
61 |
|
|
}
|
62 |
|
|
|
63 |
|
|
#endif /* GOMP_MUTEX_H */
|