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47 lines
2.6 KiB
C
47 lines
2.6 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 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/calls/struct/timespec.h"
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#include "libc/errno.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/sysv/consts/utime.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/time.h"
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/**
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* Sleeps for particular number of microseconds.
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*
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* @return 0 on success, or -1 w/ errno
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* @raise EINTR if a signal was delivered while sleeping
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* @raise ECANCELED if thread was cancelled in masked mode
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* @see clock_nanosleep()
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* @cancelationpoint
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* @norestart
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*/
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int usleep(uint64_t micros) {
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// All OSes except OpenBSD return instantly on usleep(0). So we might
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// as well avoid system call overhead and helping OpenBSD work better
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if (micros) {
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errno_t err;
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struct timespec ts = timespec_frommicros(micros);
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err = clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, 0);
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if (err)
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return errno = err, -1;
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}
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return 0;
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}
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