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

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1 735 jeremybenn
/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc.
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   Contributed by Richard Henderson <rth@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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/* Provide target-specific access to the futex system call.  */
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#include <sys/syscall.h>
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static inline long
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sys_futex0 (int *addr, int op, int val)
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{
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  register long int r0  __asm__ ("r0");
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  register long int r3  __asm__ ("r3");
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  register long int r4  __asm__ ("r4");
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  register long int r5  __asm__ ("r5");
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  register long int r6  __asm__ ("r6");
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  r0 = SYS_futex;
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  r3 = (long) addr;
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  r4 = op;
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  r5 = val;
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  r6 = 0;
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  /* ??? The powerpc64 sysdep.h file clobbers ctr; the powerpc32 sysdep.h
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     doesn't.  It doesn't much matter for us.  In the interest of unity,
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     go ahead and clobber it always.  */
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  __asm volatile ("sc; mfcr %0"
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                  : "=r"(r0), "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6)
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                  : "r"(r0), "r"(r3), "r"(r4), "r"(r5), "r"(r6)
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                  : "r7", "r8", "r9", "r10", "r11", "r12",
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                    "cr0", "ctr", "memory");
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  if (__builtin_expect (r0 & (1 << 28), 0))
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    return r3;
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  return 0;
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}
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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 = sys_futex0 (addr, gomp_futex_wait, val);
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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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      sys_futex0 (addr, gomp_futex_wait, val);
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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 = sys_futex0 (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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      sys_futex0 (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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