96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
// 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_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;
|
|
|
|
// 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
|