linux sleeping with clock_nanosleep
Solution 1
As far as I understand, I have to give an absolute time as input.
No, the flags
argument allows you to choose relative or absolute time. You want
clock_nanosleep(CLOCK_REALTIME, 0, &deadline, NULL);
to specify one microsecond from now.
Solution 2
Your deadline tv is not an absolute time. To form an absolute time, get the current time with clock_gettime()
(http://linux.die.net/man/3/clock_gettime), then add your sleep interval.
struct timespec deadline;
clock_gettime(CLOCK_MONOTONIC, &deadline);
// Add the time you want to sleep
deadline.tv_nsec += 1000;
// Normalize the time to account for the second boundary
if(deadline.tv_nsec >= 1000000000) {
deadline.tv_nsec -= 1000000000;
deadline.tv_sec++;
}
clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME, &deadline, NULL);
Note that I'm using CLOCK_MONOTONIC instead of CLOCK_REALTIME. You don't actually care what time it is, you just want the clock to be consistent.
Solution 3
@ryanyuyu
sample code::
void mysleep_ms(int milisec)
{
struct timespec res;
res.tv_sec = milisec/1000;
res.tv_nsec = (milisec*1000000) % 1000000000;
clock_nanosleep(CLOCK_MONOTONIC, 0, &res, NULL);
}
this is monotonic clock based sleep function. please refer it.
Related videos on Youtube
Avb Avb
Updated on July 12, 2022Comments
-
Avb Avb almost 2 years
I want to use clock_nanosleep for waiting of 1 microsec.. As far as I understand, I have to give an absolute time as input. Is the following code okay in this case?
deadline.tv_sec = 0; deadline.tv_nsec = 1000; clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, &deadline, NULL);
-
PlasmaHH over 10 yearswhat does the manpage say, and when you tried it, what did you observe?
-
PlasmaHH over 10 yearsI am pretty sure that here more than a microsecond has passed since the epoch, but since you haven't mentioned why it seems that something is wrong with your implementation, it might be different at your location.
-
Mike Seymour over 10 years@AvbAvb: You can use
TIMER_ABSTIME
to set absolute time, or0
to set relative time. It looks like you want to do the latter.
-
-
ryanyuyu over 9 yearsCan you elaborate on this some more? Maybe provide example code?