Mercurial > hg > CbC > CbC_gcc
annotate libgomp/config/linux/wait.h @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
| author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 22 Mar 2011 17:18:12 +0900 |
| parents | a06113de4d67 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1 /* Copyright (C) 2008, 2009, 2011 Free Software Foundation, Inc. |
| 0 | 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_WAIT_H | |
| 30 #define GOMP_WAIT_H 1 | |
| 31 | |
| 32 #include "libgomp.h" | |
| 33 #include <errno.h> | |
| 34 | |
| 35 #define FUTEX_WAIT 0 | |
| 36 #define FUTEX_WAKE 1 | |
| 37 #define FUTEX_PRIVATE_FLAG 128L | |
| 38 | |
| 39 #ifdef HAVE_ATTRIBUTE_VISIBILITY | |
| 40 # pragma GCC visibility push(hidden) | |
| 41 #endif | |
| 42 | |
| 43 extern long int gomp_futex_wait, gomp_futex_wake; | |
| 44 | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
45 #include <futex.h> |
| 0 | 46 |
| 47 static inline void do_wait (int *addr, int val) | |
| 48 { | |
| 49 unsigned long long i, count = gomp_spin_count_var; | |
| 50 | |
| 51 if (__builtin_expect (gomp_managed_threads > gomp_available_cpus, 0)) | |
| 52 count = gomp_throttled_spin_count_var; | |
| 53 for (i = 0; i < count; i++) | |
| 54 if (__builtin_expect (*addr != val, 0)) | |
| 55 return; | |
| 56 else | |
| 57 cpu_relax (); | |
| 58 futex_wait (addr, val); | |
| 59 } | |
| 60 | |
| 61 #ifdef HAVE_ATTRIBUTE_VISIBILITY | |
| 62 # pragma GCC visibility pop | |
| 63 #endif | |
| 64 | |
| 65 #endif /* GOMP_WAIT_H */ |