00001 // Support for concurrent programing -*- C++ -*- 00002 00003 // Copyright (C) 2003, 2004 00004 // Free Software Foundation, Inc. 00005 // 00006 // This file is part of the GNU ISO C++ Library. This library is free 00007 // software; you can redistribute it and/or modify it under the 00008 // terms of the GNU General Public License as published by the 00009 // Free Software Foundation; either version 2, or (at your option) 00010 // any later version. 00011 00012 // This library is distributed in the hope that it will be useful, 00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 // GNU General Public License for more details. 00016 00017 // You should have received a copy of the GNU General Public License along 00018 // with this library; see the file COPYING. If not, write to the Free 00019 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 00020 // USA. 00021 00022 // As a special exception, you may use this file as part of a free software 00023 // library without restriction. Specifically, if other files instantiate 00024 // templates or use macros or inline functions from this file, or you compile 00025 // this file and link it with other files to produce an executable, this 00026 // file does not by itself cause the resulting executable to be covered by 00027 // the GNU General Public License. This exception does not however 00028 // invalidate any other reasons why the executable file might be covered by 00029 // the GNU General Public License. 00030 00031 /** @file concurrence.h 00032 * This is an internal header file, included by other library headers. 00033 * You should not attempt to use it directly. 00034 */ 00035 00036 #ifndef _CONCURRENCE_H 00037 #define _CONCURRENCE_H 1 00038 00039 // GCC's thread abstraction layer 00040 #include "bits/gthr.h" 00041 00042 #if __GTHREADS 00043 00044 # ifdef __GTHREAD_MUTEX_INIT 00045 # define __glibcxx_mutex_type __gthread_mutex_t 00046 # define __glibcxx_mutex_define_initialized(NAME) \ 00047 __gthread_mutex_t NAME = __GTHREAD_MUTEX_INIT 00048 # define __glibcxx_mutex_lock(NAME) \ 00049 __gthread_mutex_lock(&NAME) 00050 # else 00051 // Implies __GTHREAD_MUTEX_INIT_FUNCTION 00052 struct __glibcxx_mutex : public __gthread_mutex_t 00053 { 00054 __glibcxx_mutex() { __GTHREAD_MUTEX_INIT_FUNCTION(this); } 00055 }; 00056 00057 # define __glibcxx_mutex_type __glibcxx_mutex 00058 # define __glibcxx_mutex_define_initialized(NAME) \ 00059 __glibcxx_mutex NAME 00060 # define __glibcxx_mutex_lock(NAME) \ 00061 __gthread_mutex_lock(&NAME) 00062 # endif 00063 00064 # define __glibcxx_mutex_unlock(NAME) __gthread_mutex_unlock(&NAME) 00065 00066 #else 00067 00068 # define __glibcxx_mutex_type __gthread_mutex_t 00069 # define __glibcxx_mutex_define_initialized(NAME) __gthread_mutex_t NAME 00070 # define __glibcxx_mutex_lock(NAME) 00071 # define __glibcxx_mutex_unlock(NAME) 00072 00073 #endif 00074 00075 namespace __gnu_cxx 00076 { 00077 typedef __glibcxx_mutex_type mutex_type; 00078 00079 /// @brief Scoped lock idiom. 00080 // Acquire the mutex here with a constructor call, then release with 00081 // the destructor call in accordance with RAII style. 00082 class lock 00083 { 00084 // Externally defined and initialized. 00085 mutex_type& device; 00086 00087 public: 00088 explicit lock(mutex_type& name) : device(name) 00089 { __glibcxx_mutex_lock(device); } 00090 00091 ~lock() throw() 00092 { __glibcxx_mutex_unlock(device); } 00093 00094 private: 00095 lock(const lock&); 00096 lock& operator=(const lock&); 00097 }; 00098 } 00099 00100 #endif