Boost 类库是个开源的类库,传说中的准标准库这下将会是我阅读Boost 多线程源代码的心得.
费话少说,在使用BOOST的多线程我们都会引入boost/thread.hpp这一个文件好我们先找到这个文件将它打开
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// Copyright (C) 2001-2003
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// William E. Kempf
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// (C) Copyright 2008 Anthony Williams
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See www.boost.org/libs/thread for documentation.
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#if !defined(BOOST_THREAD_WEK01082003_HPP)
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#define BOOST_THREAD_WEK01082003_HPP
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#include <boost/thread/thread.hpp>
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#include <boost/thread/condition_variable.hpp>
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#include <boost/thread/exceptions.hpp>
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#include <boost/thread/mutex.hpp>
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#include <boost/thread/once.hpp>
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#include <boost/thread/recursive_mutex.hpp>
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#include <boost/thread/tss.hpp>
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#include <boost/thread/thread_time.hpp>
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#include <boost/thread/locks.hpp>
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#include <boost/thread/shared_mutex.hpp>
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#include <boost/thread/barrier.hpp>
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#endif 从这些代码可以看出,boost/thread.hpp只是引用文件而已,看不到任何世界的C++代码,
我们顺着这些#include一个一个打开
先是#include <boost/thread/thread.hpp>
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#ifndef BOOST_THREAD_THREAD_HPP
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#define BOOST_THREAD_THREAD_HPP
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// thread.hpp
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//
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// (C) Copyright 2007-8 Anthony Williams
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/thread/detail/platform.hpp>
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#if defined(BOOST_THREAD_PLATFORM_WIN32)
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#include <boost/thread/win32/thread_data.hpp>
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#elif defined(BOOST_THREAD_PLATFORM_PTHREAD)
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#include <boost/thread/pthread/thread_data.hpp>
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#else
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#error "Boost threads unavailable on this platform"
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#endif
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#include <boost/thread/detail/thread.hpp>
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#endif
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明显这里是一个对不同平台作出的定义,
boost/thread/detail/是一个基本由宏定义组成的HPP文件,我们站且跳过
我们以WIN32入手...
#include <boost/thread/win32/thread_data.hpp>
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#ifndef BOOST_THREAD_PTHREAD_THREAD_DATA_HPP
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#define BOOST_THREAD_PTHREAD_THREAD_DATA_HPP
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// (C) Copyright 2007 Anthony Williams
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#include <boost/thread/detail/config.hpp>
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#include <boost/thread/exceptions.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/enable_shared_from_this.hpp>
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#include <boost/thread/mutex.hpp>
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#include <boost/optional.hpp>
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#include <pthread.h>
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#include "condition_variable_fwd.hpp"
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#include <boost/config/abi_prefix.hpp>
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namespace boost
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{
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class thread;
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namespace detail
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{
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struct thread_exit_callback_node;
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struct tss_data_node;
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struct thread_data_base;
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typedef boost::shared_ptr<thread_data_base> thread_data_ptr;
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struct BOOST_THREAD_DECL thread_data_base:
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enable_shared_from_this<thread_data_base>
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{
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thread_data_ptr self;
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pthread_t thread_handle;
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boost::mutex data_mutex;
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boost::condition_variable done_condition;
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boost::mutex sleep_mutex;
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boost::condition_variable sleep_condition;
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bool done;
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bool join_started;
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bool joined;
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boost::detail::thread_exit_callback_node* thread_exit_callbacks;
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boost::detail::tss_data_node* tss_data;
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bool interrupt_enabled;
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bool interrupt_requested;
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pthread_cond_t* current_cond;
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thread_data_base():
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done(false),join_started(false),joined(false),
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thread_exit_callbacks(0),tss_data(0),
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interrupt_enabled(true),
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interrupt_requested(false),
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current_cond(0)
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{}
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virtual ~thread_data_base();
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typedef pthread_t native_handle_type;
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virtual void run()=0;
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};
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BOOST_THREAD_DECL thread_data_base* get_current_thread_data();
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class interruption_checker
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{
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thread_data_base* const thread_info;
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void check_for_interruption()
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{
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if(thread_info->interrupt_requested)
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{
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thread_info->interrupt_requested=false;
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throw thread_interrupted();
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}
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}
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void operator=(interruption_checker&);
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public:
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explicit interruption_checker(pthread_cond_t* cond):
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thread_info(detail::get_current_thread_data())
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{
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if(thread_info && thread_info->interrupt_enabled)
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{
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lock_guard<mutex> guard(thread_info->data_mutex);
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check_for_interruption();
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thread_info->current_cond=cond;
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}
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}
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~interruption_checker()
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{
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if(thread_info && thread_info->interrupt_enabled)
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{
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lock_guard<mutex> guard(thread_info->data_mutex);
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thread_info->current_cond=NULL;
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check_for_interruption();
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}
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}
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};
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}
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namespace this_thread
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{
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void BOOST_THREAD_DECL yield();
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void BOOST_THREAD_DECL sleep(system_time const& abs_time);
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template<typename TimeDuration>
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inline void sleep(TimeDuration const& rel_time)
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{
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this_thread::sleep(get_system_time()+rel_time);
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}
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}
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}
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#include <boost/config/abi_suffix.hpp>
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#endif
水平有限....貌似停留在只能自己看懂....
posted on 2009-05-09 20:43
^乔乔^ 阅读(1955)
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