[Octave-bug-tracker] [bug #55940] pause() takes too long if you call it a bunch

[Andrew Janke]

Follow-up Comment #15, bug #55940 (project octave):

Test program:


#include <time.h>
#include <stdio.h>
#include <ctime>
#include <chrono>

extern "C"
int main (int argc, char *argv[]) {
        using namespace std::chrono;

        int n = 100;
        int delay = 200;

    time_t tv_sec = 0;
    long tv_nsec = delay * 1000000;
    struct timespec delay_timespec;
    delay_timespec.tv_sec = tv_sec;
    delay_timespec.tv_nsec = tv_nsec;

    struct timespec rem;

        for (int i = 0; i < n; i++) {
                high_resolution_clock::time_point t0 = 
high_resolution_clock::now();
                nanosleep (&delay_timespec, &rem);
                high_resolution_clock::time_point t1 = 
high_resolution_clock::now();
                duration<double> time_span = duration_cast<duration<double> 
>(t1 - t0);

                printf ("Step %4d: elapsed = %f\n", i, time_span.count());
        }
}


Results:


$ ./a.out
Step    0: elapsed = 0.202791
Step    1: elapsed = 0.201132
Step    2: elapsed = 0.200450
Step    3: elapsed = 0.200035
Step    4: elapsed = 0.201446
Step    5: elapsed = 0.200258
Step    6: elapsed = 0.200578
Step    7: elapsed = 0.200934
[...]


It's within a few milliseconds of 200 ms each time I run it.

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