| // 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. |
| |
| /** @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 |