小编Tyl*_*ler的帖子

在参考文档中std::condition_variable有这个例子：

#include <condition_variable>
#include <iostream>
#include <mutex>
#include <string>
#include <thread>
 
std::mutex m;
std::condition_variable cv;
std::string data;
bool ready = false;
bool processed = false;
 
void worker_thread()
{
    // Wait until main() sends data
    std::unique_lock lk(m);
    cv.wait(lk, []{ return ready; });
 
    // after the wait, we own the lock.
    std::cout << "Worker thread is processing data\n";
    data += " after processing";
 
    // Send data back to main()
    processed = true;
    std::cout << "Worker thread signals data processing completed\n"; …