www.pudn.com > tristripper-1.1.0-beta-5.zip > high_res_timer.cpp

 
#include "stdafx.h" 
#include "high_res_timer.h" 
 
#if defined (WIN32) 
 
#define WIN32_LEAN_AND_MEAN		// Exclude rarely-used stuff from Windows headers 
#include  
#undef WIN32_LEAN_AND_MEAN 
#undef max 
#undef min 
 
 
 
 
high_res_timer::high_res_timer() 
{ 
	// get frequency 
	if (QueryPerformanceFrequency((LARGE_INTEGER *) &m_Frequency) == 0) 
		throw timer_error("QueryPerformanceFrequency() not supported"); 
 
	// Reset() 
	if (QueryPerformanceCounter((LARGE_INTEGER *) &m_StartTime) == 0) 
		throw timer_error("QueryPerformanceCounter() not supported"); 
} 
 
 
 
high_res_timer::counter high_res_timer::QueryCounter() const 
{ 
	counter Counter; 
 
	QueryPerformanceCounter((LARGE_INTEGER *) &Counter); 
 
	return Counter; 
} 
 
#endif // defined (WIN32) 
 
 
 
 
#if defined (UNIX) 
 
#include  
 
 
 
high_res_timer::high_res_timer() 
{ 
	timeval tv; 
 
	// test routine 
	if (gettimeofday(&tv, NULL)) 
		throw timer_error("gettimeofday() error"); 
 
	// get frequency (gettimeofday() can get down to 1 micro-second) 
	m_Frequency = 1000000; 
	m_StartTime = (counter(tv.tv_sec) * m_Frequency + counter(tv.tv_usec)); 
} 
 
 
 
high_res_timer::counter high_res_timer::QueryCounter() const 
{ 
	timeval tv; 
	gettimeofday(&tv, NULL); 
 
	return (counter(tv.tv_sec) * m_Frequency + counter(tv.tv_usec)); 
} 
 
 
 
#endif // defined (UNIX) 
 
 
 
void high_res_timer::Reset() 
{ 
	m_StartTime = QueryCounter(); 
}