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【C】 c++生产者消费者

作者:郭剑锋 / 发布于2013/6/20/ 624


	// Copyright (C) 2001-2003
	// William E. Kempf
	//
	// Distributed under the Boost Software License, Version 1.0. (See accompanying
	// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
	// 生产者,消费者模式..

	
	#include <boost/thread/condition.hpp>
	#include <boost/thread/mutex.hpp>
	#include <boost/thread/thread.hpp>
	#include <iostream>
	#include <vector>

	class bounded_buffer : private boost::noncopyable
	{
	public:
	typedef boost::mutex::scoped_lock lock;
	bounded_buffer ( int n ) : begin ( 0 ), end ( 0 ), buffered ( 0 ), circular_buf ( n ) { }
	void send ( int m )
	{
	 lock lk ( monitor );
	 while ( buffered == circular_buf.size() )
	 buffer_not_full.wait ( lk );
	 circular_buf[end] = m;
	 end = ( end+1 ) % circular_buf.size();
	 ++buffered;
	 buffer_not_empty.notify_one();
	}
	int receive()
	{
	 lock lk ( monitor );
	 while ( buffered == 0 )
	 buffer_not_empty.wait ( lk );
	 int i = circular_buf[begin];
	 begin = ( begin+1 ) % circular_buf.size();
	 --buffered;
	 buffer_not_full.notify_one();
	 return i;
	}
	private:
	int begin, end, buffered;
	std::vector<int> circular_buf;
	boost::condition buffer_not_full, buffer_not_empty;
	boost::mutex monitor;
	};
	bounded_buffer buf ( 2 );

	void sender()
	{
	int n = 0;
	while ( n < 100 )
	{
	 buf.send ( n );
	 std::cout << "sent: " << n << std::endl;
	 ++n;
	}
	buf.send ( -1 );
	}

	void receiver()
	{
	int n;
	do
	{
	 n = buf.receive();
	 std::cout << "received: " << n << std::endl;
	}
	while ( n != -1 ); // -1 indicates end of buffer
	}

	int main()
	{
	boost::thread thrd1 ( &sender );
	boost::thread thrd2 ( &receiver );
	thrd1.join();
	thrd2.join();
	}

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