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

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1 735 jeremybenn
/* Copyright (C) 2010, 2011 Free Software Foundation, Inc.
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   Contributed by ARM Ltd.
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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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/* Provide target-specific access to the futex system call.  */
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/* The include file hierachy above us (wait.h) has pushed visibility
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   hidden, this will be applied to prototypes with headers we include
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   with the effect that we cannot link against an external function
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   (syscall). The solution here is to push default visibility, include
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   our required headers then reinstante the original visibility.  */
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#pragma GCC visibility push(default)
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#define _GNU_SOURCE 
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#include <unistd.h>
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#include <sys/syscall.h>
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#pragma GCC visibility pop
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static inline void
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futex_wait (int *addr, int val)
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{
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  long err = syscall (SYS_futex, addr, gomp_futex_wait, val, NULL);
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  if (__builtin_expect (err == -ENOSYS, 0))
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    {
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      gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
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      gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
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      syscall (SYS_futex, addr, gomp_futex_wait, val, NULL);
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    }
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}
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static inline void
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futex_wake (int *addr, int count)
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{
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  long err = syscall (SYS_futex, addr, gomp_futex_wake, count);
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  if (__builtin_expect (err == -ENOSYS, 0))
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    {
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      gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
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      gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
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      syscall (SYS_futex, addr, gomp_futex_wake, count);
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    }
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}
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static inline void
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cpu_relax (void)
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{
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  __asm volatile ("" : : : "memory");
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}

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