Windows几种延时精确度的测试源码

// SleepTest.cpp : 定义控制台应用程序的入口点。 // #include "stdafx.h" #include <windows.h> #include <chrono> #include <string> #include <thread> #pragma comment(lib,"ws2_32.lib") #pragma comment(lib,"WinMM.Lib") using namespace std; using namespace std::chrono; #define TEST_TIMES 500 #define BUFFER_SIZE 40960 #define Interval_Microseconds 500 #define Interval_Millisceonds 1 void Precision_Sleep() { std::string buffer; buffer.assign(BUFFER_SIZE, 0); buffer.clear(); int i = TEST_TIMES; uint64_t total_used = 0; // Test for Sleep; while (i) { i--; steady_clock::time_point time_begin = steady_clock::now(); Sleep(Interval_Millisceonds); steady_clock::time_point time_end = steady_clock::now(); char tmp[128] = {0}; uint64_t used = duration_cast<microseconds>(time_end - time_begin).count(); snprintf(tmp, 128, "%s Sleep %d ms, time used : %lld us\n", __FUNCTION__, Interval_Millisceonds, used); total_used += used; buffer += tmp; } printf("%s\n", buffer.c_str()); printf("%s Sleep %d ms, avatar %lld us\n\n", __FUNCTION__, Interval_Millisceonds,total_used / TEST_TIMES); } void Precision_sleep_for() { // Test for sleep_for; std::string buffer; buffer.assign(BUFFER_SIZE, 0); buffer.clear(); int i = TEST_TIMES; uint64_t total_used = 0; while (i) { i--; steady_clock::time_point time_begin = steady_clock::now(); std::this_thread::sleep_for(microseconds(Interval_Microseconds)); steady_clock::time_point time_end = steady_clock::now(); char tmp[128] = {0}; uint64_t used = duration_cast<microseconds>(time_end - time_begin).count(); snprintf(tmp, 128, "%s Sleep %d us, time used : %lld us\n", __FUNCTION__, Interval_Microseconds, used); total_used += used; buffer += tmp; } printf("%s", buffer.c_str()); printf("%s Sleep %d us , avatar %lld us\n\n", __FUNCTION__, Interval_Microseconds, total_used / TEST_TIMES); } void Precision_sleep_for_timeBeginPeriod() { // Test for sleep_for and timeBeginPeriod; std::string buffer; buffer.assign(BUFFER_SIZE, 0); buffer.clear(); int i = TEST_TIMES; uint64_t total_used = 0; while (i) { i--; steady_clock::time_point time_begin = steady_clock::now(); timeBeginPeriod(1);//set Minimum timer resolution. std::this_thread::sleep_for(microseconds(Interval_Microseconds)); timeEndPeriod(1); steady_clock::time_point time_end = steady_clock::now(); char tmp[128] = {0}; uint64_t used = duration_cast<microseconds>(time_end - time_begin).count(); snprintf(tmp, 128, "%s Sleep %d us , time used : %lld us\n", __FUNCTION__, Interval_Microseconds, used); total_used += used; buffer += tmp; } printf("%s", buffer.c_str()); printf("%s Sleep %d us , avatar %lld us\n\n", __FUNCTION__,Interval_Microseconds, total_used / TEST_TIMES); } void SleepSelectUS(SOCKET s, int64_t usec) { struct timeval tv; fd_set dummy; FD_ZERO(&dummy); FD_SET(s, &dummy); tv.tv_sec = usec / 1000000L; tv.tv_usec = usec % 1000000L; select(0, 0, 0, &dummy, &tv); DWORD err = GetLastError(); if (err != 0) printf("Error : %d", err); } void Precision_select() { // Test for select; std::string buffer; buffer.assign(BUFFER_SIZE, 0); buffer.clear(); int i = TEST_TIMES; uint64_t total_used = 0; WORD wVersionRequested = MAKEWORD(1, 0); WSADATA wsaData; WSAStartup(wVersionRequested, &wsaData); SOCKET s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); while (i) { i--; steady_clock::time_point time_begin = steady_clock::now(); SleepSelectUS(s, Interval_Microseconds); steady_clock::time_point time_end = steady_clock::now(); char tmp[128] = {0}; uint64_t used = duration_cast<microseconds>(time_end - time_begin).count(); snprintf(tmp, 128, "%s Sleep %d us, time used : %lld us\n",__FUNCTION__, Interval_Microseconds, used); total_used += used; buffer += tmp; } closesocket(s); printf("%s", buffer.c_str()); printf("%s Sleep %d us, avatar %lld us\n\n", __FUNCTION__, Interval_Microseconds, total_used / TEST_TIMES); } void SleepPerformUS(DWORD usec) { LARGE_INTEGER perfCnt, start, now; QueryPerformanceFrequency(&perfCnt); QueryPerformanceCounter(&start); do { QueryPerformanceCounter((LARGE_INTEGER*)&now); } while ((now.QuadPart - start.QuadPart) / float(perfCnt.QuadPart) * 1000 * 1000 < usec); } void Precision_QueryPerformanceCounter() { // Test for QueryPerformanceCounter; std::string buffer; buffer.assign(BUFFER_SIZE, 0); buffer.clear(); int i = TEST_TIMES; uint64_t total_used = 0; WORD wVersionRequested = MAKEWORD(1, 0); WSADATA wsaData; WSAStartup(wVersionRequested, &wsaData); SOCKET s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); while (i) { i--; steady_clock::time_point time_begin = steady_clock::now(); SleepPerformUS(Interval_Microseconds); steady_clock::time_point time_end = steady_clock::now(); char tmp[128] = {0}; uint64_t used = duration_cast<microseconds>(time_end - time_begin).count(); snprintf(tmp, 128, "%s Sleep %d us, time used : %lld us\n", __FUNCTION__,Interval_Microseconds, used); total_used += used; buffer += tmp; } closesocket(s); printf("%s", buffer.c_str()); printf("%s Sleep %d us, avatar %lld us\n\n", __FUNCTION__, Interval_Microseconds,total_used / TEST_TIMES); } void Precision_MsgWaitForMultipleObjectsEx() { std::string buffer; buffer.assign(BUFFER_SIZE, 0); buffer.clear(); int i = TEST_TIMES; uint64_t total_used = 0; while (i) { i--; steady_clock::time_point time_begin = steady_clock::now(); MsgWaitForMultipleObjectsEx(0, NULL, Interval_Millisceonds, QS_ALLPOSTMESSAGE, MWMO_INPUTAVAILABLE); steady_clock::time_point time_end = steady_clock::now(); char tmp[128] = {0}; uint64_t used = duration_cast<microseconds>(time_end - time_begin).count(); snprintf(tmp, 128, "%s Sleep %d ms, time used : %lld us\n", __FUNCTION__, Interval_Millisceonds, used); total_used += used; buffer += tmp; } printf("%s", buffer.c_str()); printf("%s Sleep %d ms, avatar %lld us\n\n", __FUNCTION__, Interval_Millisceonds, total_used / TEST_TIMES); } int main() { // Test for Sleep; //Precision_Sleep(); // Test for sleep_for; //Precision_sleep_for(); // Test for sleep_for and timeBeginPeriod; //Precision_sleep_for_timeBeginPeriod(); // Test for select; Precision_select(); // Test for QueryPerformanceCounter; //Precision_QueryPerformanceCounter(); // Test for MsgWaitForMultipleObjectsEx; //Precision_MsgWaitForMultipleObjectsEx(); system("pause"); return 0; }