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comparison libgomp/config/linux/wait.h @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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-1:000000000000 0:a06113de4d67
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_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
45 #include "futex.h"
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 */