mirror of
https://github.com/jart/cosmopolitan.git
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3f0bcdc3ef
- 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)
51 lines
2.8 KiB
C
51 lines
2.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 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 "libc/assert.h"
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#include "libc/calls/struct/timespec.h"
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#include "libc/errno.h"
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#include "libc/limits.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/time/time.h"
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/**
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* Sleeps for particular number of seconds.
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*
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* @return 0 if the full time elapsed, otherwise we assume an interrupt
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* was delivered, in which case the errno condition is ignored, and
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* this function shall return the number of unslept seconds rounded
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* using the ceiling function, and finally `-1u` may be returned if
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* thread was cancelled with `PTHREAD_CANCEL_MASKED` in play
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* @see clock_nanosleep()
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* @cancellationpoint
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* @asyncsignalsafe
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* @norestart
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*/
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unsigned sleep(unsigned seconds) {
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errno_t rc;
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unsigned unslept;
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struct timespec tv = {seconds};
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if (!(rc = clock_nanosleep(CLOCK_REALTIME, 0, &tv, &tv))) return 0;
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if (rc == ECANCELED) return -1u;
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_npassert(rc == EINTR);
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unslept = tv.tv_sec;
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if (tv.tv_nsec && unslept < UINT_MAX) {
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++unslept;
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}
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return unslept;
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}
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