mirror of
https://github.com/jart/cosmopolitan.git
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63 lines
3.1 KiB
C
63 lines
3.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include <assert.h>
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#include <stdio.h>
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#include <time.h>
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#include "libc/assert.h"
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#define MAXIMUM 1e9
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#define ITERATIONS 10
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const char *MyDescribeClockName(int clock) {
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if (clock == CLOCK_REALTIME)
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return "CLOCK_REALTIME";
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if (clock == CLOCK_MONOTONIC)
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return "CLOCK_MONOTONIC";
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if (clock == CLOCK_REALTIME_COARSE)
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return "CLOCK_REALTIME_COARSE";
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if (clock == CLOCK_MONOTONIC_COARSE)
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return "CLOCK_MONOTONIC_COARSE";
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__builtin_trap();
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}
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void TestSleepRelative(int clock) {
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printf("\n");
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printf("testing: clock_nanosleep(%s) with relative timeout\n",
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MyDescribeClockName(clock));
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for (long nanos = 1; nanos < (long)MAXIMUM; nanos *= 2) {
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struct timespec t1, t2, wf;
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wf = timespec_fromnanos(nanos);
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if (clock_gettime(clock, &t1))
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return;
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for (int i = 0; i < ITERATIONS; ++i) {
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unassert(!clock_nanosleep(clock, 0, &wf, 0));
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}
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clock_gettime(clock, &t2);
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long took = timespec_tonanos(timespec_sub(t2, t1)) / ITERATIONS;
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printf("%,12ld ns sleep took %,12ld ns delta %,12ld ns\n", nanos, took,
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took - nanos);
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}
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}
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int main(int argc, char *argv[]) {
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TestSleepRelative(CLOCK_REALTIME);
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TestSleepRelative(CLOCK_MONOTONIC);
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TestSleepRelative(CLOCK_REALTIME_COARSE);
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TestSleepRelative(CLOCK_MONOTONIC_COARSE);
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}
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