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Improve cancellations, randomness, and time

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- Exhaustively document cancellation points
- Rename SIGCANCEL to SIGTHR just like BSDs
- Further improve POSIX thread cancellations
- Ensure asynchronous cancellations work correctly
- Elevate the quality of getrandom() and getentropy()
- Make futexes cancel correctly on OpenBSD 6.x and 7.x
- Add reboot.com and shutdown.com to examples directory
- Remove underscore prefix from awesome timespec_*() APIs
- Create assertions that help verify our cancellation points
- Remove bad timespec APIs (cmp generalizes eq/ne/gt/gte/lt/lte)
This commit is contained in:
Justine Tunney 2022-11-05 19:49:41 -07:00
parent 0d7c265392
commit 3f0bcdc3ef
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GPG key ID: BE714B4575D6E328
173 changed files with 1599 additions and 782 deletions
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14
examples/clock.c
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@ -20,22 +20,22 @@ int main(int argc, char *argv[]) {
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);
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)) {
now = timespec_mono();
if (timespec_cmp(now, next) >= 0) {
break;
}
}
}
next = _timespec_add(next, interval);
next = timespec_add(next, interval);
printf("consumed %10g seconds monotonic time and %10g seconds cpu time\n",
_timespec_tonanos(_timespec_sub(now, start)) / 1000000000.,
timespec_tonanos(timespec_sub(now, start)) / 1000000000.,
(double)clock() / CLOCKS_PER_SEC);
}
}