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/* Copyright (C) 2005, 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/>.  */

/* Provide target-specific access to the futex system call.  */

#include <sys/syscall.h>

static inline long

sys_futex0 (int *addr, int op, int val)

{

  register long int gpr2  __asm__ ("2");

  register long int gpr3  __asm__ ("3");

  register long int gpr4  __asm__ ("4");

  register long int gpr5  __asm__ ("5");

  gpr2 = (long) addr;

  gpr3 = op;

  gpr4 = val;

  gpr5 = 0;

  __asm volatile ("svc %b1"

                  : "=d" (gpr2)

                  : "i" (SYS_futex),

                    "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5)

                  : "memory");

  return gpr2;

}

static inline void

futex_wait (int *addr, int val)

{

  long err = sys_futex0 (addr, gomp_futex_wait, val);

  if (__builtin_expect (err == -ENOSYS, 0))

    {

      gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;

      gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;

      sys_futex0 (addr, gomp_futex_wait, val);

    }

}

static inline void

futex_wake (int *addr, int count)

{

  long err = sys_futex0 (addr, gomp_futex_wake, count);

  if (__builtin_expect (err == -ENOSYS, 0))

    {

      gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;

      gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;

      sys_futex0 (addr, gomp_futex_wake, count);

    }

}

static inline void

cpu_relax (void)

{

  __asm volatile ("" : : : "memory");

}