64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/* $OpenBSD: synch.h,v 1.10 2024/01/07 19:44:28 cheloha Exp $ */
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/*
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* Copyright (c) 2017 Martin Pieuchot
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* 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 WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/atomic.h>
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#include <sys/time.h>
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#include <sys/futex.h>
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static inline int
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_wake(volatile uint32_t *p, int n)
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{
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return futex(p, FUTEX_WAKE, n, NULL, NULL);
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}
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static inline int
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_twait(volatile uint32_t *p, int val, clockid_t clockid, const struct timespec *abs)
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{
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struct timespec now, rel;
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int saved_errno = errno;
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int error;
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if (abs == NULL) {
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error = futex(p, FUTEX_WAIT, val, NULL, NULL);
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if (error == -1) {
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error = errno;
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errno = saved_errno;
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}
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return error;
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}
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if (!timespecisvalid(abs) || clock_gettime(clockid, &now))
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return EINVAL;
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if (timespeccmp(abs, &now, <=))
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return ETIMEDOUT;
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timespecsub(abs, &now, &rel);
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error = futex(p, FUTEX_WAIT, val, &rel, NULL);
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if (error == -1) {
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error = errno;
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errno = saved_errno;
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}
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return error;
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}
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static inline int
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_requeue(volatile uint32_t *p, int n, int m, volatile uint32_t *q)
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{
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return futex(p, FUTEX_REQUEUE, n, (void *)(long)m, q);
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}
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