C++ sleep 毫秒精确度函数的实现

用代码说话，不对请指正。

timmer.h

#pragma once
#if defined(__linux__) || defined(__unix__)
#define sleep sleep_unix
#include "sys/socket.h"
#elif defined(_WIN32)
#define sleep sleep_windows
#include <winsock2.h>  
#include <WS2tcpip.h>
#pragma comment(lib,"Winmm.lib")
#pragma comment(lib,"ws2_32.lib")  
#endif // 
#include "stdarg.h"
#include "time.h"

void sleep_unix(unsigned const int millisecond);
void sleep_windows(unsigned const int millisecond);

timmer.cpp

#include "timmer.h"
void sleep_unix(unsigned const int millisecond) {
	timeval timeout;
	timeout.tv_sec = millisecond / 1000;
	timeout.tv_usec =millisecond % 1000*1000;
	::select(0, NULL, NULL, NULL, &timeout);
	return;
}
#if defined(_WIN32)
void sleep_windows(unsigned const int millisecond) {
	timeBeginPeriod(1);
	Sleep(millisecond);
	DWORD dwTime = ::timeGetTime();
	timeEndPeriod(1);
}
#endif