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@martani
Created Jul 26, 2011
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nanosleep, usleep, sleep benchmark
void nsleep(long us)
{
struct timespec wait;
//printf("Will sleep for is %ld\n", diff); //This will take extra ~70 microseconds
wait.tv_sec = us / (1000 * 1000);
wait.tv_nsec = (us % (1000 * 1000)) * 1000;
nanosleep(&wait, NULL);
}
main()
{
struct timeval t1, t2;
long long t;
long microseconds = 970000;
//nanosleep test
gettimeofday(&t1, NULL);
nsleep(microseconds);
gettimeofday(&t2, NULL);
t = ((t2.tv_sec * 1000000) + t2.tv_usec) - ((t1.tv_sec * 1000000) + t1.tv_usec);
printf("Call to nsleep(%d) took %lld\n", microseconds, t);
//usleep test
gettimeofday(&t1, NULL);
usleep(microseconds);
gettimeofday(&t2, NULL);
t = ((t2.tv_sec * 1000000) + t2.tv_usec) - ((t1.tv_sec * 1000000) + t1.tv_usec);
printf("Call to usleep(%ld) took %lld\n", microseconds, t);
//sleep test
gettimeofday(&t1, NULL);
sleep(1);
gettimeofday(&t2, NULL);
t = ((t2.tv_sec * 1000000) + t2.tv_usec) - ((t1.tv_sec * 1000000) + t1.tv_usec);
printf("Call to sleep(1) took %lld\n", t);
}
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