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Improve quality of our ANSI C clock() function

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It now works most excellently across all supported operating
sytsems (earlier it didn't work on NT and XNU). Demo code is
available in examples/clock.c and this change also adds some
of the newer ANSI C time functions like timespec_get(), plus
timespec_getres() which hasn't even come out yet as it's C23
This commit is contained in:
Justine Tunney 2022-09-05 21:43:49 -07:00
parent 7ff0ea8c13
commit 12d9e1e128
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GPG key ID: BE714B4575D6E328
24 changed files with 254 additions and 76 deletions
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41
examples/clock.c Normal file
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@ -0,0 +1,41 @@
#if 0
/*─────────────────────────────────────────────────────────────────╗
│ To the extent possible under law, Justine Tunney has waived │
│ all copyright and related or neighboring rights to this file, │
│ as it is written in the following disclaimers: │
│ • http://unlicense.org/ │
│ • http://creativecommons.org/publicdomain/zero/1.0/ │
╚─────────────────────────────────────────────────────────────────*/
#endif
#include "libc/calls/struct/timespec.h"
#include "libc/stdio/stdio.h"
#include "libc/time/time.h"
/**
* @fileoverview clock() function demo
*/
int main(int argc, char *argv[]) {
unsigned long i;
volatile unsigned long x;
struct timespec now, start, next, interval;
printf("hammering the cpu...\n");
next = start = _timespec_mono();
interval = _timespec_frommillis(500);
next = _timespec_add(next, interval);
for (;;) {
for (i = 0;; ++i) {
x *= 7;
if (!(i % 256)) {
now = _timespec_mono();
if (_timespec_gte(now, next)) {
break;
}
}
}
next = _timespec_add(next, interval);
printf("consumed %10g seconds monotonic time and %10g seconds cpu time\n",
_timespec_tonanos(_timespec_sub(now, start)) / 1000000000.,
(double)clock() / CLOCKS_PER_SEC);
}
}

10
examples/hostname.c
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@ -8,14 +8,14 @@
╚─────────────────────────────────────────────────────────────────*/
#endif
#include "libc/calls/calls.h"
#include "libc/intrin/kprintf.h"
#include "libc/log/check.h"
#include "libc/stdio/stdio.h"
int main(int argc, char *argv[]) {
char name[254];
CHECK_NE(-1, gethostname(name, sizeof(name)));
printf("gethostname() → %`'s\n", name);
CHECK_NE(-1, getdomainname(name, sizeof(name)));
printf("getdomainname() → %`'s\n", name);
gethostname(name, sizeof(name));
kprintf("gethostname() → %#s\n", name);
getdomainname(name, sizeof(name));
kprintf("getdomainname() → %#s\n", name);
return 0;
}