// Support for concurrent programing -*- C++ -*-

// Copyright (C) 2003, 2004
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library 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 2, or (at your option)
// any later version.

// This library 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.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

#ifndef _CONCURRENCE_H
#define _CONCURRENCE_H 1

// GCC's thread abstraction layer
#include "bits/gthr.h"

#if __GTHREADS

# ifdef __GTHREAD_MUTEX_INIT
#  define __glibcxx_mutex_define_initialized(NAME) \
__gthread_mutex_t NAME = __GTHREAD_MUTEX_INIT
#  define __glibcxx_mutex_lock(NAME) \
__gthread_mutex_lock(&NAME)
# else
// Implies __GTHREAD_MUTEX_INIT_FUNCTION
#  define __glibcxx_mutex_define_initialized(NAME) \
__gthread_mutex_t NAME; \
__gthread_once_t NAME ## _once = __GTHREAD_ONCE_INIT; \
void NAME ## _init() { __GTHREAD_MUTEX_INIT_FUNCTION(&NAME); }
# define __glibcxx_mutex_lock(NAME) \
__gthread_once(&NAME ## _once, NAME ## _init); \
__gthread_mutex_lock(&NAME)
# endif

# define __glibcxx_mutex_unlock(NAME) __gthread_mutex_unlock(&NAME)

#else

# define __glibcxx_mutex_define_initialized(NAME)
# define __glibcxx_mutex_lock(NAME)
# define __glibcxx_mutex_unlock(NAME)

#endif

#endif