barrier/base/CStopwatch.cpp

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2001-10-06 14:13:28 +00:00
#include "CStopwatch.h"
//
// CStopwatch
//
CStopwatch::CStopwatch(bool triggered) :
m_mark(0.0),
m_triggered(triggered),
m_stopped(triggered)
{
if (!triggered)
m_mark = getClock();
}
CStopwatch::~CStopwatch()
{
// do nothing
}
double CStopwatch::reset()
{
if (m_stopped) {
const double dt = m_mark;
m_mark = 0.0;
return dt;
}
else {
const double t = getClock();
const double dt = t - m_mark;
m_mark = t;
return dt;
}
}
void CStopwatch::stop()
{
if (m_stopped)
return;
// save the elapsed time
m_mark = getClock() - m_mark;
m_stopped = true;
}
void CStopwatch::start()
{
m_triggered = false;
if (!m_stopped)
return;
// set the mark such that it reports the time elapsed at stop()
m_mark = getClock() - m_mark;
m_stopped = false;
}
void CStopwatch::setTrigger()
{
stop();
m_triggered = true;
}
double CStopwatch::getTime()
{
if (m_triggered) {
const double dt = m_mark;
start();
return dt;
}
if (m_stopped)
return m_mark;
return getClock() - m_mark;
}
CStopwatch::operator double()
{
return getTime();
}
bool CStopwatch::isStopped() const
{
return m_stopped;
}
double CStopwatch::getTime() const
{
if (m_stopped)
return m_mark;
return getClock() - m_mark;
}
CStopwatch::operator double() const
{
return getTime();
}
#if defined(CONFIG_PLATFORM_UNIX)
#include <sys/time.h>
double CStopwatch::getClock() const
{
struct timeval t;
gettimeofday(&t, NULL);
return (double)t.tv_sec + 1.0e-6 * (double)t.tv_usec;
}
#endif // CONFIG_PLATFORM_UNIX
#if defined(CONFIG_PLATFORM_WIN32)
// avoid getting a lot a crap from mmsystem.h that we don't need
#define MMNODRV // Installable driver support
#define MMNOSOUND // Sound support
#define MMNOWAVE // Waveform support
#define MMNOMIDI // MIDI support
#define MMNOAUX // Auxiliary audio support
#define MMNOMIXER // Mixer support
#define MMNOJOY // Joystick support
#define MMNOMCI // MCI support
#define MMNOMMIO // Multimedia file I/O support
#define MMNOMMSYSTEM // General MMSYSTEM functions
#include <windows.h>
#include <mmsystem.h>
typedef WINMMAPI DWORD (WINAPI *PTimeGetTime)(void);
static double s_freq = 0.0;
static HINSTANCE s_mmInstance = NULL;
static PTimeGetTime s_tgt = NULL;
//
// initialize local variables
//
class CStopwatchInit {
public:
CStopwatchInit();
~CStopwatchInit();
};
static CStopwatchInit s_init;
CStopwatchInit::CStopwatchInit()
{
LARGE_INTEGER freq;
if (QueryPerformanceFrequency(&freq) && freq.QuadPart != 0) {
s_freq = 1.0 / static_cast<double>(freq.QuadPart);
}
else {
// load winmm.dll and get timeGetTime
s_mmInstance = LoadLibrary("winmm");
if (s_mmInstance)
s_tgt = (PTimeGetTime)GetProcAddress(s_mmInstance, "timeGetTime");
}
}
CStopwatchInit::~CStopwatchInit()
{
if (s_mmInstance)
FreeLibrary(reinterpret_cast<HMODULE>(s_mmInstance));
}
double CStopwatch::getClock() const
{
// get time. we try three ways, in order of descending precision
if (s_freq != 0.0) {
LARGE_INTEGER c;
QueryPerformanceCounter(&c);
return s_freq * static_cast<double>(c.QuadPart);
}
else if (s_tgt) {
return 0.001 * static_cast<double>(s_tgt());
}
else {
return 0.001 * static_cast<double>(GetTickCount());
}
}
#endif // CONFIG_PLATFORM_WIN32