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Fix some issues

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Justine Tunney 2023-10-09 20:18:48 -07:00
parent 211d5d902e
commit 9d372f48dd
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GPG key ID: BE714B4575D6E328
29 changed files with 373 additions and 63 deletions
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tool/viz/setitimer_accuracy.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2023 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/struct/itimerval.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/struct/timespec.h"
#include "libc/calls/struct/timeval.h"
#include "libc/fmt/itoa.h"
#include "libc/sysv/consts/itimer.h"
#include "libc/sysv/consts/sig.h"
#define HZ 120
struct timeval start;
struct timeval expect;
struct timeval interval = {0, 1e6 / HZ};
void OnTick(int sig) {
char ibuf[27];
struct timeval now = timeval_real();
switch (timeval_cmp(now, expect)) {
case 0:
tinyprint(1, "100% precise\n", NULL);
break;
case -1:
FormatInt64Thousands(ibuf, timeval_tomicros(timeval_sub(expect, now)));
tinyprint(1, ibuf, " µs early\n", NULL);
break;
case +1:
FormatInt64Thousands(ibuf, timeval_tomicros(timeval_sub(now, expect)));
tinyprint(1, ibuf, " µs late\n", NULL);
break;
default:
__builtin_unreachable();
}
expect = timeval_add(expect, interval);
}
int main(int argc, char *argv[]) {
start = timeval_real();
expect = timeval_add(start, interval);
signal(SIGALRM, OnTick);
setitimer(ITIMER_REAL, &(struct itimerval){interval, interval}, 0);
for (;;) pause();
}