Mercurial > hg > CbC > CbC_gcc
diff libgomp/config/linux/wait.h @ 0:a06113de4d67
first commit
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 | f6334be47118 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libgomp/config/linux/wait.h Fri Jul 17 14:47:48 2009 +0900 @@ -0,0 +1,65 @@ +/* Copyright (C) 2008, 2009 Free Software Foundation, Inc. + Contributed by Jakub Jelinek <jakub@redhat.com>. + + This file is part of the GNU OpenMP Library (libgomp). + + Libgomp is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3, or (at your option) + any later version. + + Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY + WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS + FOR A PARTICULAR PURPOSE. See the GNU General Public License for + more details. + + Under Section 7 of GPL version 3, you are granted additional + permissions described in the GCC Runtime Library Exception, version + 3.1, as published by the Free Software Foundation. + + You should have received a copy of the GNU General Public License and + a copy of the GCC Runtime Library Exception along with this program; + see the files COPYING3 and COPYING.RUNTIME respectively. If not, see + <http://www.gnu.org/licenses/>. */ + +/* This is a Linux specific implementation of a mutex synchronization + mechanism for libgomp. This type is private to the library. This + implementation uses atomic instructions and the futex syscall. */ + +#ifndef GOMP_WAIT_H +#define GOMP_WAIT_H 1 + +#include "libgomp.h" +#include <errno.h> + +#define FUTEX_WAIT 0 +#define FUTEX_WAKE 1 +#define FUTEX_PRIVATE_FLAG 128L + +#ifdef HAVE_ATTRIBUTE_VISIBILITY +# pragma GCC visibility push(hidden) +#endif + +extern long int gomp_futex_wait, gomp_futex_wake; + +#include "futex.h" + +static inline void do_wait (int *addr, int val) +{ + unsigned long long i, count = gomp_spin_count_var; + + if (__builtin_expect (gomp_managed_threads > gomp_available_cpus, 0)) + count = gomp_throttled_spin_count_var; + for (i = 0; i < count; i++) + if (__builtin_expect (*addr != val, 0)) + return; + else + cpu_relax (); + futex_wait (addr, val); +} + +#ifdef HAVE_ATTRIBUTE_VISIBILITY +# pragma GCC visibility pop +#endif + +#endif /* GOMP_WAIT_H */