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From John Davis, a little addition to the Windows version of the osg::Timer

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constructor such that a static variable is used to force the constructor
to check the number of clock cycles per second once, this means that
multiple timers can now be created with incurring a the 1 second delay
used for timming the clock speed every time the constructor is called.
This commit is contained in:
Robert Osfield
2001-12-16 16:30:34 +00:00
parent 3952a3484b
commit 786dfea3c8
1 changed files with 27 additions and 10 deletions
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37
src/osg/Timer.cpp
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@@ -29,11 +29,19 @@ using namespace osg;
else
{
Timer_t start_time = tick();
Sleep (1000);
Timer_t end_time = tick();
// use a static here to ensure that the Sleep(..) for 1 sec
// is not incurred more than once per app execution.
static double _tempSecsPerClick=0.0;
if (_tempSecsPerClick==0.0)
{
Timer_t start_time = tick();
Sleep (1000);
Timer_t end_time = tick();
_tempSecsPerClick = 1.0/(double)(end_time-start_time);
}
_secsPerClick = _tempSecsPerClick;
_secsPerClick = 1.0/(double)(end_time-start_time);
}
}
@@ -136,13 +144,9 @@ using namespace osg;
Timer::Timer( void )
{
_useStandardClock = false;
_useStandardClock = false; // default to false.
if (_useStandardClock)
{
_secsPerClick = 1e-6; // gettimeofday()'s precision.
}
else
if (!_useStandardClock)
{
__psunsigned_t phys_addr, raddr;
unsigned int cycleval;
@@ -178,7 +182,20 @@ using namespace osg;
_clockAddress = (unsigned long *)iotimer_addr;
_secsPerClick = (double)(cycleval)* 1e-12;
// this is to force the use of the standard clock in
// instances which the realtime clock is of such a small
// size that it will loop too rapidly for proper realtime work.
// this happens on the O2 for instance.
if (_cycleCntrSize<=32) _useStandardClock=true;
}
if (_useStandardClock)
{
_secsPerClick = 1e-6; // gettimeofday()'s precision.
}
}
#elif defined (__APPLE_CC__) || defined (macintosh)