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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, 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
-