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// 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// 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.
/** @file concurrence.h
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
#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_type __gthread_mutex_t
# 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
struct __glibcxx_mutex : public __gthread_mutex_t
{
__glibcxx_mutex() { __GTHREAD_MUTEX_INIT_FUNCTION(this); }
};
# define __glibcxx_mutex_type __glibcxx_mutex
# define __glibcxx_mutex_define_initialized(NAME) \
__glibcxx_mutex NAME
# define __glibcxx_mutex_lock(NAME) \
__gthread_mutex_lock(&NAME)
# endif
# define __glibcxx_mutex_unlock(NAME) __gthread_mutex_unlock(&NAME)
#else
# define __glibcxx_mutex_type __gthread_mutex_t
# define __glibcxx_mutex_define_initialized(NAME) __gthread_mutex_t NAME
# define __glibcxx_mutex_lock(NAME)
# define __glibcxx_mutex_unlock(NAME)
#endif
namespace __gnu_cxx
{
typedef __glibcxx_mutex_type mutex_type;
/// @brief Scoped lock idiom.
// Acquire the mutex here with a constructor call, then release with
// the destructor call in accordance with RAII style.
class lock
{
// Externally defined and initialized.
mutex_type& device;
public:
explicit lock(mutex_type& name) : device(name)
{ __glibcxx_mutex_lock(device); }
~lock() throw()
{ __glibcxx_mutex_unlock(device); }
private:
lock(const lock&);
lock& operator=(const lock&);
};
}
#endif
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