diff --git a/extension/xhprof.c b/extension/xhprof.c
index a053ede..d70483a 100644
--- a/extension/xhprof.c
+++ b/extension/xhprof.c
@@ -1313,14 +1313,18 @@ static double get_cpu_frequency() {
return 0.0;
}
uint64 tsc_start = cycle_timer();
- /* Sleep for 5 miliseconds. Comparaing with gettimeofday's few microseconds
- * execution time, this should be enough. */
- usleep(5000);
- if (gettimeofday(&end, 0)) {
- perror("gettimeofday");
- return 0.0;
- }
- uint64 tsc_end = cycle_timer();
+ uint64 tsc_end;
+ volatile int i;
+ /* Busy loop for 5 miliseconds. */
+ do {
+ for (i = 0; i < 1000000; i++);
+ if (gettimeofday(&end, 0)) {
+ perror("gettimeofday");
+ return 0.0;
+ }
+ tsc_end = cycle_timer();
+ } while (get_us_interval(&start, &end) < 5000);
+
return (tsc_end - tsc_start) * 1.0 / (get_us_interval(&start, &end));
}