单个生产者和单个消费者模型(spsc)

// LockFree.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"

#include 
#include 
#include 

#include 

	int producer_count = 0;
boost::atomic_int consumer_count (0);

boost::lockfree::spsc_queue > spsc_queue;

const int iterations = 10000000;

void producer(void)
{
	int count = 0;
	for (int i = 0; i != iterations; ++i) {
		int value = ++producer_count;
		while (!spsc_queue.push(value)) //队列满则等待。
			++count;
	}
	std::cout << "full " << count << " times\n";
}

boost::atomic done (false);

void consumer(void)
{
	int value;
	while (!done) { //生产者还在生产
		while (spsc_queue.pop(value)) //如果有产品就消费
			++consumer_count;
	}

	while (spsc_queue.pop(value)) //生产者停工
		++consumer_count;
}

int main(int argc, char* argv[])
{
	using namespace std;
	cout << "boost::lockfree::queue is ";
	if (!spsc_queue.is_lock_free())
		cout << "not ";
	cout << "lockfree" << endl;

	boost::thread producer_thread(producer);
	boost::thread consumer_thread(consumer);

	producer_thread.join();
	done = true;
	consumer_thread.join();

	cout << "produced " << producer_count << " objects." << endl;
	cout << "consumed " << consumer_count << " objects." << endl;
}