条件变量的简单使用

环境: windows + vs2015

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参考:
https://blog.youkuaiyun.com/qq_44875284/article/details/123876085

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直接上代码:

#include <Windows.h>
#include <thread>
#include <mutex>
#include <atomic>
#include <iostream>
#include <condition_variable>

using namespace std;

std::mutex mtx;
std::condition_variable cond;

void func1(int& apple)
{
	while (1)
	{
		{
			std::unique_lock<std::mutex> lck(mtx);
			apple += 1;
			cond.notify_one();//唤醒一个等待的线程
		}
		
		Sleep(1000);
	}
}

void func2(int& apple)
{
	while (1)
	{
		std::unique_lock<std::mutex> lck(mtx);
		if (apple) {
			std::cout << apple << '\n';
			apple -= 1;
			continue;
		}

		cond.wait(lck);//等待线程
	}
}

int main()
{
	int apple = 0;
	std::thread t1(func1, std::ref(apple));
	std::thread t2(func2, std::ref(apple));
	t2.join();
	t1.join();

	cin.get();
	return 0;
}

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记录完成