放出几个珍藏多年的延时函数（高低精度高低性能）

逃离我推掉我的手 2022-07-29 06:30 52阅读 0赞

#include "stdafx.h"
    #include "delay.h"
    
    
    
    void DoEvents()
    {
    	MSG msg;
    	while (PeekMessage(&msg, (HWND)NULL, 0, 0, PM_REMOVE)) {
    		if (msg.message == WM_QUIT)
    		{
    			return;
    		}
    		TranslateMessage(&msg);
    		DispatchMessage(&msg);
    	}
    }
    
    //@(1)@延时 优点：低cpu；缺点：程序被卡死。
    void NormalDelay(DWORD dwMilliSecond)
    {
    	Sleep(dwMilliSecond);
    }
    
    //@(2)@ 高精度，狂占CPU，单位微秒
    void LowPerformanceHighPrecisionDelay(LONGLONG llMicrosecond)
    {
    
    	LARGE_INTEGER CurrTicks, TicksCount;
    
    	QueryPerformanceFrequency(&TicksCount);
    	QueryPerformanceCounter(&CurrTicks);
    
    	TicksCount.QuadPart = TicksCount.QuadPart * llMicrosecond / 1000000ll;
    	TicksCount.QuadPart += CurrTicks.QuadPart;
    	while (CurrTicks.QuadPart < TicksCount.QuadPart)
    	{
    		QueryPerformanceCounter(&CurrTicks);
    	}
    }
    
    
    
    DWORD WINAPI DelayInThread(LPVOID lpParam)
    {
    	DWORD* pMillSecond = (DWORD*)lpParam;
    	Sleep(*pMillSecond);
    	return 0;
    }
    
    
    //@(3)@多线程实现的不卡死、低cpu,低精度
    BOOL HighPerformanceLowPrecisionDelayDelay(DWORD dwMilliSecond)
    {
    	HANDLE hThread;
    	DWORD  RethThread;
    	hThread = ::CreateThread(nullptr, 0, DelayInThread, &dwMilliSecond, 0, &RethThread);
    	if (hThread == NULL)
    	{
    		return FALSE;
    	}
    
    	for (;;)
    	{
    		DoEvents();
    
    		if (WAIT_TIMEOUT == WaitForSingleObject(hThread, 1))
    		{
    		}
    		else
    		{
    			break;
    		}
    	}
    	CloseHandle(hThread);
    	return TRUE;
    }
    
    
    
    
    //不卡死、低cpu,高精度延时,毫秒
    BOOL HighPerformanceHighPrecisionDelay(UINT64 n64MilliSecond)
    {
    	HANDLE hTimer;
    	LARGE_INTEGER liDueTime;
    
    	liDueTime.QuadPart = -10 * n64MilliSecond * 1000LL;
    
    	DoEvents();
    
    	hTimer = CreateWaitableTimer(nullptr, FALSE, nullptr);
    	if (NULL == hTimer)
    	{
    		return	FALSE;
    	}
    
    	if (!SetWaitableTimer(hTimer, &liDueTime, 0, NULL, NULL, 0))
    	{
    		//printf("SetWaitableTimer failed (%d)\n", GetLastError());
    		return FALSE;
    	}
    
    	DWORD ret;
    	while (ret = MsgWaitForMultipleObjects(1, &hTimer, FALSE, INFINITE, QS_ALLINPUT) != WAIT_OBJECT_0)
    	{
    		if (((WAIT_OBJECT_0 + 1) == ret) || (WAIT_TIMEOUT == ret))
    		{
    			DoEvents();
    		}
    		else
    		{
    			//WAIT_TIMEOUT,WAIT_FAILED
    			break;
    		}
    	}
    
    	CancelWaitableTimer(hTimer);
    
    	CloseHandle(hTimer);
    
    	DoEvents();
    
    	return TRUE;
    
    }