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#include <iostream>
#include <atomic>
#include <thread>
#include <chrono>
std::atomic<std::chrono::system_clock::time_point> timestamp(std::chrono::system_clock::now());
std::atomic<bool> thread_end;
void Timer(void) {
std::chrono::system_clock::time_point start = std::chrono::system_clock::now();
std::chrono::system_clock::time_point now = std::chrono::system_clock::now();
int count = 200;
while(count--) {
// 每50mS將目前的time_point寫入timestamp。
do {
now = std::chrono::system_clock::now();
}
while(std::chrono::duration_cast<std::chrono::milliseconds>(now-start).count()<50);
timestamp.store(now);
start = now;
}
thread_end = true;
}
int main() {
thread_end = false;
timestamp.store(std::chrono::system_clock::now());
std::thread timer(Timer);
while(!thread_end) {
// 持續觀察目前的time_point跟timestamp的時間差。
std::chrono::system_clock::time_point now = std::chrono::system_clock::now();
std::chrono::system_clock::time_point last = timestamp.load();
// 如果時間差大於60mS，印出時間差。
if(std::chrono::duration_cast<std::chrono::milliseconds>(now-last).count()>60) {
std::cout<<std::chrono::duration_cast<std::chrono::milliseconds>(now-last).count()<<std::endl;
}
}
timer.join();
return (0);
}
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