Added: Function to prefer high resolution local time
This commit is contained in:
parent
0b749547b8
commit
8560e1c146
2 changed files with 51 additions and 1 deletions
code/nel
|
@ -86,7 +86,13 @@ public:
|
|||
* time that is the same on all computers.
|
||||
* \warning On Win32, the value is on 32 bits only. It wraps around to 0 every about 49.71 days.
|
||||
*/
|
||||
static TTime getLocalTime ();
|
||||
static TTime getLocalTime();
|
||||
|
||||
/** Same as getLocalTime, but prefers high resolution timers.
|
||||
* Must call probe once in the beginning of the application before using,
|
||||
* to ensure the correct settings are applied.
|
||||
*/
|
||||
static TTime getLocalTimeHR();
|
||||
|
||||
/** Return the time in processor ticks. Use it for profile purpose.
|
||||
* If the performance time is not supported on this hardware, it returns 0.
|
||||
|
|
|
@ -37,6 +37,12 @@
|
|||
namespace NLMISC
|
||||
{
|
||||
|
||||
namespace {
|
||||
#ifdef NL_OS_WINDOWS
|
||||
bool a_HaveQueryPerformance = false;
|
||||
#endif
|
||||
}
|
||||
|
||||
void CTime::probeTimerInfo(CTime::CTimerInfo &result)
|
||||
{
|
||||
breakable
|
||||
|
@ -65,6 +71,7 @@ void CTime::probeTimerInfo(CTime::CTimerInfo &result)
|
|||
result.IsHighPrecisionAvailable = false;
|
||||
result.HighPrecisionResolution = 1000;
|
||||
}
|
||||
a_HaveQueryPerformance = result.IsHighPrecisionAvailable;
|
||||
if (!result.IsHighPrecisionAvailable)
|
||||
{
|
||||
lowResTime = timeGetTime();
|
||||
|
@ -292,6 +299,43 @@ TTime CTime::getLocalTime ()
|
|||
#endif
|
||||
}
|
||||
|
||||
#ifdef NL_OS_WINDOWS
|
||||
namespace {
|
||||
struct CQPFProvider
|
||||
{
|
||||
CQPFProvider()
|
||||
{
|
||||
QueryPerformanceFrequency(&Frequency);
|
||||
}
|
||||
LARGE_INTEGER Frequency;
|
||||
};
|
||||
CQPFProvider s_QPFProvider;
|
||||
}
|
||||
#endif
|
||||
|
||||
/// Same as above but prefer high resolution timer
|
||||
TTime CTime::getLocalTimeHR()
|
||||
{
|
||||
#ifdef NL_OS_WINDOWS
|
||||
if (a_HaveQueryPerformance)
|
||||
{
|
||||
// On a (fast) 15MHz timer this rolls over after 7000 days.
|
||||
// If my calculations are right.
|
||||
LARGE_INTEGER counter;
|
||||
QueryPerformanceCounter(&counter);
|
||||
counter.QuadPart *= 1000;
|
||||
counter.QuadPart /= s_QPFProvider.Frequency.QuadPart;
|
||||
}
|
||||
else
|
||||
{
|
||||
// Use default reliable low resolution timer.
|
||||
return getLocalTime();
|
||||
}
|
||||
#else
|
||||
// Other OS always use the best available high resolution timer.
|
||||
return getLocalTime();
|
||||
#endif
|
||||
}
|
||||
|
||||
/* Return the time in processor ticks. Use it for profile purpose.
|
||||
* If the performance time is not supported on this hardware, it returns 0.
|
||||
|
|
Loading…
Reference in a new issue