Subversion Repositories openrisc

/* 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_PTRLOCK_H

#define GOMP_PTRLOCK_H 1

typedef struct { void *ptr; gomp_mutex_t lock; } gomp_ptrlock_t;

static inline void gomp_ptrlock_init (gomp_ptrlock_t *ptrlock, void *ptr)

{

  ptrlock->ptr = ptr;

  gomp_mutex_init (&ptrlock->lock);

}

static inline void *gomp_ptrlock_get (gomp_ptrlock_t *ptrlock)

{

  if (ptrlock->ptr != NULL)

    return ptrlock->ptr;

  gomp_mutex_lock (&ptrlock->lock);

  if (ptrlock->ptr != NULL)

    {

      gomp_mutex_unlock (&ptrlock->lock);

      return ptrlock->ptr;

    }

  return NULL;

}

static inline void gomp_ptrlock_set (gomp_ptrlock_t *ptrlock, void *ptr)

{

  ptrlock->ptr = ptr;

  gomp_mutex_unlock (&ptrlock->lock);

}

static inline void gomp_ptrlock_destroy (gomp_ptrlock_t *ptrlock)

{

  gomp_mutex_destroy (&ptrlock->lock);

}

#endif /* GOMP_PTRLOCK_H */