Mercurial > hg > CbC > CbC_gcc
comparison libgomp/config/linux/mutex.c @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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children | 04ced10e8804 |
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1 /* Copyright (C) 2005, 2008, 2009 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 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 #include "wait.h" | |
30 | |
31 long int gomp_futex_wake = FUTEX_WAKE | FUTEX_PRIVATE_FLAG; | |
32 long int gomp_futex_wait = FUTEX_WAIT | FUTEX_PRIVATE_FLAG; | |
33 | |
34 void | |
35 gomp_mutex_lock_slow (gomp_mutex_t *mutex) | |
36 { | |
37 do | |
38 { | |
39 int oldval = __sync_val_compare_and_swap (mutex, 1, 2); | |
40 if (oldval != 0) | |
41 do_wait (mutex, 2); | |
42 } | |
43 while (!__sync_bool_compare_and_swap (mutex, 0, 2)); | |
44 } | |
45 | |
46 void | |
47 gomp_mutex_unlock_slow (gomp_mutex_t *mutex) | |
48 { | |
49 futex_wake (mutex, 1); | |
50 } |