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1， std:lock_guard、unique_lock、condition_variable 一般使用实例

#include <condition_variable>
#include <mutex>
#include <future>
#include <iostream>

bool readyFlag; 
std::mutex readyMutex;
std::condition_variable readyCondVar;

void thread1()
{
    // do something thread2 needs as preparation
    std::cout << "<return>" << std::endl;
    std::cin.get();

    // signal that thread1 has prepared a condition
    {
        std::lock_guard<std::mutex> lg(readyMutex);
        readyFlag = true;
    } // release lock
    readyCondVar.notify_one();
}

void thread2()
{
    // wait until thread1 is ready (readyFlag is true)
    {
        std::unique_lock<std::mutex> ul(readyMutex);
        readyCondVar.wait(ul, []{ return readyFlag; });
    } // release lock

    // do whatever shall happen after thread1 has prepared things
    std::cout << "done" << std::endl;

本文标签： 用在lockguardstdconditionvariablewait

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