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44 lines
1.6 KiB
C
44 lines
1.6 KiB
C
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#if 0
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/*─────────────────────────────────────────────────────────────────╗
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│ To the extent possible under law, Justine Tunney has waived │
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│ all copyright and related or neighboring rights to this file, │
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│ as it is written in the following disclaimers: │
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│ • http://unlicense.org/ │
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│ • http://creativecommons.org/publicdomain/zero/1.0/ │
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╚─────────────────────────────────────────────────────────────────*/
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#endif
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#include "libc/assert.h"
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#include "libc/calls/struct/timespec.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/consts/clock.h"
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/**
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* @fileoverview shows how accurate clock_nanosleep() is
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*/
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int main(int argc, char *argv[]) {
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long i, ns;
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struct timespec x, y, w;
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timespec_sleep(timespec_fromnanos(0)); // warmup
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printf("\nrelative sleep\n");
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for (i = 0; i < 28; ++i) {
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ns = 1l << i;
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x = timespec_real();
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timespec_sleep(timespec_fromnanos(ns));
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y = timespec_real();
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printf("%,11ld ns sleep took %,ld ns\n", ns,
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timespec_tonanos(timespec_sub(y, x)));
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}
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printf("\nabsolute sleep\n");
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for (i = 0; i < 28; ++i) {
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ns = 1l << i;
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x = timespec_real();
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timespec_sleep_until(timespec_add(x, timespec_fromnanos(ns)));
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y = timespec_real();
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printf("%,11ld ns sleep took %,ld ns\n", ns,
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timespec_tonanos(timespec_sub(y, x)));
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}
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}
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