void microsleep(unsigned long usec)
{
- struct timeval delay;
+ if (usec < 5000)
+ {
+ /* we want to wait less than 5 ms -- if we assume that we have a
+ kernel timer resolution of 10 ms, we would wait far to long;
+ therefore it's better to do a short interval of busy waiting
+ to get our sleeping time more accurate */
+
+ long base_counter = Counter(), actual_counter = Counter();
+ long delay = usec/1000;
+
+ while (actual_counter < base_counter+delay &&
+ actual_counter >= base_counter)
+ actual_counter = Counter();
+ }
+ else
+ {
+ struct timeval delay;
- delay.tv_sec = usec / 1000000;
- delay.tv_usec = usec % 1000000;
+ delay.tv_sec = usec / 1000000;
+ delay.tv_usec = usec % 1000000;
- if (select(0,NULL,NULL,NULL,&delay)!=0)
- fprintf(stderr,"%s: in function microsleep: select failed!\n",
- progname);
+ if (select(0,NULL,NULL,NULL,&delay) != 0)
+ fprintf(stderr,"%s: in function microsleep: select failed!\n",
+ progname);
+ }
}
long mainCounter(int mode)
counter_ms = (current_time.tv_sec - base_time.tv_sec)*1000
+ (current_time.tv_usec - base_time.tv_usec)/1000;
- if (mode == READ_COUNTER_100)
- return(counter_ms/10); /* return 1/100 secs since last init */
- else /* READ_COUNTER_1000 */
- return(counter_ms); /* return 1/1000 secs since last init */
+ return counter_ms; /* return milliseconds since last init */
}
void InitCounter() /* set counter back to zero */
mainCounter(INIT_COUNTER);
}
-long Counter() /* returns 1/100 secs since last call of InitCounter() */
+long Counter() /* get milliseconds since last call of InitCounter() */
{
- return(mainCounter(READ_COUNTER_100));
-}
-
-long Counter2() /* returns 1/1000 secs since last call of InitCounter() */
-{
- return(mainCounter(READ_COUNTER_1000));
+ return(mainCounter(READ_COUNTER));
}
void WaitCounter(long value) /* wait for counter to reach value */
long wait;
while((wait=value-Counter())>0)
- microsleep(wait*10000);
-}
-
-void WaitCounter2(long value) /* wait for counter to reach value */
-{
- long wait;
-
- while((wait=value-Counter2())>0)
- microsleep(wait*1000);
+ microsleep(wait * 1000);
}
-void Delay(long value)
+void Delay(long value) /* Delay 'value' milliseconds */
{
- microsleep(value);
+ microsleep(value * 1000);
}
BOOL DelayReached(long *counter_var, int delay)
{
long actual_frame_counter = FrameCounter;
- if (actual_frame_counter >= *frame_counter_var+frame_delay
- || actual_frame_counter < *frame_counter_var)
+ if (actual_frame_counter >= *frame_counter_var+frame_delay ||
+ actual_frame_counter < *frame_counter_var)
{
*frame_counter_var = actual_frame_counter;
return(TRUE);