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Make NET_Sleep wait 1ms less than requested, then busy-wait the last ms for better timeout precision.

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This commit is contained in:
Thilo Schulz 2011-02-23 18:09:17 +00:00
parent ccd24cd647
commit 34e0a6c6f6
2 changed files with 11 additions and 23 deletions
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25
code/qcommon/common.c
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@ -2907,7 +2907,7 @@ void Com_Frame( void ) {
int msec, minMsec; int msec, minMsec;
int timeVal; int timeVal;
static int lastTime = 0; static int lastTime = 0, bias = 0;
int timeBeforeFirstEvents; int timeBeforeFirstEvents;
int timeBeforeServer; int timeBeforeServer;
@ -2953,18 +2953,14 @@ void Com_Frame( void ) {
minMsec = 1; minMsec = 1;
timeVal = com_frameTime - lastTime; timeVal = com_frameTime - lastTime;
if(timeVal > minMsec) bias += timeVal - minMsec;
{
// Adjust minMsec if previous frame took too long to render so
// that framerate is stable at the requested value.
timeVal -= minMsec;
if(timeVal > minMsec)
minMsec = 0;
else
minMsec -= timeVal;
}
if(bias > minMsec)
bias = minMsec;
// Adjust minMsec if previous frame took too long to render so
// that framerate is stable at the requested value.
minMsec -= bias;
} }
} }
else else
@ -2973,10 +2969,11 @@ void Com_Frame( void ) {
timeVal = 0; timeVal = 0;
do do
{ {
if(com_busyWait->integer) // Busy sleep the last millisecond for better timeout precision
if(com_busyWait->integer || timeVal < 2)
NET_Sleep(0); NET_Sleep(0);
else else
NET_Sleep(timeVal); NET_Sleep(timeVal - 1);
msec = Sys_Milliseconds() - com_frameTime; msec = Sys_Milliseconds() - com_frameTime;

9
code/qcommon/net_ip.c
View file

@ -1707,18 +1707,9 @@ void NET_Sleep(int msec)
if(highestfd < 0) if(highestfd < 0)
{ {
// windows ain't happy when select is called without valid FDs // windows ain't happy when select is called without valid FDs
if(msec > 0)
msec--;
SleepEx(msec, 0); SleepEx(msec, 0);
return; return;
} }
#define TVW32_BIAS 999
// windows adds a whole millisecond of latency, otherwise granularity seems to be fine.
if(timeout.tv_usec > TVW32_BIAS)
timeout.tv_usec -= TVW32_BIAS;
#endif #endif
retval = select(highestfd + 1, &fdr, NULL, NULL, &timeout); retval = select(highestfd + 1, &fdr, NULL, NULL, &timeout);