C++11实现高精度定时器、计时器

直接上代码

#pragma once
#ifndef _TIMER_H_
#define _TIMER_H_#include <functional>
#include <chrono>
#include <thread>
#include <atomic>
#include <memory>
#include <mutex>
#include <condition_variable>
#include <Windows.h>
using namespace std;class TimeRecord
{public:TimeRecord() : m_beginTime(chrono::high_resolution_clock::now()) {}void reset() { m_beginTime = chrono::high_resolution_clock::now(); }//return millisecondsint64_t elapsed() const{return chrono::duration_cast<chrono::milliseconds>(chrono::high_resolution_clock::now() - m_beginTime).count();}//return microsecondsint64_t elapsed_micro() const{return chrono::duration_cast<chrono::microseconds>(chrono::high_resolution_clock::now() - m_beginTime).count();}//return nanosecondsint64_t elapsed_nano() const{return chrono::duration_cast<chrono::nanoseconds>(chrono::high_resolution_clock::now() - m_beginTime).count();}//return secondsint64_t elapsed_seconds() const{return chrono::duration_cast<chrono::seconds>(chrono::high_resolution_clock::now() - m_beginTime).count();}//return minutesint64_t elapsed_minutes() const{return chrono::duration_cast<chrono::minutes>(chrono::high_resolution_clock::now() - m_beginTime).count();}//return hoursint64_t elapsed_hours() const{return chrono::duration_cast<chrono::hours>(chrono::high_resolution_clock::now() - m_beginTime).count();}
private:chrono::time_point<chrono::high_resolution_clock> m_beginTime;
};class Timer
{public:Timer() : m_expired(true), m_tryToExpire(false){}Timer(const Timer& timer){m_expired = timer.m_expired.load();m_tryToExpire = timer.m_tryToExpire.load();}~Timer(){stop();}//sleep for millisecondsvoid millSleep(long milliseconds){LARGE_INTEGER litmp;LONGLONG QPart1, QPart2;double dfMinus, dfFreq, dfTim, dfSpec;QueryPerformanceFrequency(&litmp);dfFreq = (double)litmp.QuadPart;QueryPerformanceCounter(&litmp);QPart1 = litmp.QuadPart;dfSpec = 0.001*milliseconds;do{QueryPerformanceCounter(&litmp);QPart2 = litmp.QuadPart;dfMinus = (double)(QPart2 - QPart1);dfTim = dfMinus / dfFreq;} while (dfTim < dfSpec);}void startOnce(int delay, function<void()> task){thread([delay, task]() {this_thread::sleep_for(chrono::milliseconds(delay));task();}).detach();}void start(int interval, function<void()> task){// is started, do not start againif (m_expired == false)return;// start async timer, launch thread and wait in that threadm_expired = false;thread([this, interval, task]() {while (!m_tryToExpire){// sleep every interval and do the task again and again until times up//this_thread::sleep_for(chrono::milliseconds(interval));  There is an error of about 10 millisecondsmillSleep(interval);task();}{// timer be stopped, update the condition variable expired and wake main threadlock_guard<mutex> locker(m_mutex);m_expired = true;m_expiredCond.notify_one();}}).detach();}void stop(){// do not stop againif (m_expired)return;if (m_tryToExpire)return;// wait until timer m_tryToExpire = true; // change this bool value to make timer while loop stop{unique_lock<mutex> locker(m_mutex);m_expiredCond.wait(locker, [this] {return m_expired == true; });// reset the timerif (m_expired == true)m_tryToExpire = false;}}private:atomic<bool> m_expired; // timer stopped statusatomic<bool> m_tryToExpire; // timer is in stop processmutex m_mutex;condition_variable m_expiredCond;
};
#endif /

测试代码

 Timer timer;std::cout << "--- start period timer ----" << std::endl;timer.start(10, std::bind(func2, 3));std::cout << "--- stop period timer ----" << std::endl;timer.stop();

参考文档
https://zhuanlan.zhihu.com/p/64746342
https://www.bbsmax.com/A/WpdKgpLndV/
https://blog.csdn.net/zj1131190425/article/details/98777584
https://www.runoob.com/cplusplus/cpp-date-time.html
https://blog.csdn.net/wangningyu/article/details/82051206

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C++11实现高精度定时器、计时器

C++11实现高精度定时器、计时器

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