concurrence.h

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 #ifndef _CONCURRENCE_H 00032 #define _CONCURRENCE_H 1 00033 00034 // GCC's thread abstraction layer 00035 #include "bits/gthr.h" 00036 00037 #if __GTHREADS 00038 00039 # ifdef __GTHREAD_MUTEX_INIT 00040 # define __glibcxx_mutex_type __gthread_mutex_t 00041 # define __glibcxx_mutex_define_initialized(NAME) \ 00042 __gthread_mutex_t NAME = __GTHREAD_MUTEX_INIT 00043 # define __glibcxx_mutex_lock(NAME) \ 00044 __gthread_mutex_lock(&NAME) 00045 # else 00046 // Implies __GTHREAD_MUTEX_INIT_FUNCTION 00047 struct __glibcxx_mutex : public __gthread_mutex_t 00048 { 00049 __glibcxx_mutex() { __GTHREAD_MUTEX_INIT_FUNCTION(this); } 00050 }; 00051 00052 # define __glibcxx_mutex_type __glibcxx_mutex 00053 # define __glibcxx_mutex_define_initialized(NAME) \ 00054 __glibcxx_mutex NAME 00055 # define __glibcxx_mutex_lock(NAME) \ 00056 __gthread_mutex_lock(&NAME) 00057 # endif 00058 00059 # define __glibcxx_mutex_unlock(NAME) __gthread_mutex_unlock(&NAME) 00060 00061 #else 00062 00063 # define __glibcxx_mutex_type __gthread_mutex_t 00064 # define __glibcxx_mutex_define_initialized(NAME) __gthread_mutex_t NAME 00065 # define __glibcxx_mutex_lock(NAME) 00066 # define __glibcxx_mutex_unlock(NAME) 00067 00068 #endif 00069 00070 namespace __gnu_cxx 00071 { 00072 typedef __glibcxx_mutex_type mutex_type; 00073 00074 // Scoped lock idiom. 00075 // Acquire the mutex here with a constructor call, then release with 00076 // the destructor call in accordance with RAII style. 00077 class lock 00078 { 00079 // Externally defined and initialized. 00080 mutex_type& device; 00081 00082 public: 00083 explicit lock(mutex_type& name) : device(name) 00084 { __glibcxx_mutex_lock(device); } 00085 00086 ~lock() throw() 00087 { __glibcxx_mutex_unlock(device); } 00088 00089 private: 00090 lock(const lock&); 00091 lock& operator=(const lock&); 00092 }; 00093 } 00094 00095 #endif

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