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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgomp/] [config/] [linux/] [wait.h] - Blame information for rev 735

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1 735 jeremybenn
/* Copyright (C) 2008, 2009, 2011 Free Software Foundation, Inc.
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   Contributed by Jakub Jelinek <jakub@redhat.com>.
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   This file is part of the GNU OpenMP Library (libgomp).
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   Libgomp is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3, or (at your option)
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   any later version.
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   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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   FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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   more details.
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   Under Section 7 of GPL version 3, you are granted additional
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   permissions described in the GCC Runtime Library Exception, version
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   3.1, as published by the Free Software Foundation.
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   You should have received a copy of the GNU General Public License and
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   a copy of the GCC Runtime Library Exception along with this program;
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   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
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   <http://www.gnu.org/licenses/>.  */
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/* This is a Linux specific implementation of a mutex synchronization
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   mechanism for libgomp.  This type is private to the library.  This
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   implementation uses atomic instructions and the futex syscall.  */
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#ifndef GOMP_WAIT_H
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#define GOMP_WAIT_H 1
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#include "libgomp.h"
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#include <errno.h>
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#define FUTEX_WAIT      0
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#define FUTEX_WAKE      1
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#define FUTEX_PRIVATE_FLAG      128L
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#ifdef HAVE_ATTRIBUTE_VISIBILITY
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# pragma GCC visibility push(hidden)
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#endif
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extern long int gomp_futex_wait, gomp_futex_wake;
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#include <futex.h>
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static inline int do_spin (int *addr, int val)
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{
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  unsigned long long i, count = gomp_spin_count_var;
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  if (__builtin_expect (gomp_managed_threads > gomp_available_cpus, 0))
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    count = gomp_throttled_spin_count_var;
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  for (i = 0; i < count; i++)
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    if (__builtin_expect (*addr != val, 0))
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      return 0;
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    else
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      cpu_relax ();
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  return 1;
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}
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static inline void do_wait (int *addr, int val)
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{
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  if (do_spin (addr, val))
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    futex_wait (addr, val);
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}
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#ifdef HAVE_ATTRIBUTE_VISIBILITY
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# pragma GCC visibility pop
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#endif
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#endif /* GOMP_WAIT_H */

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