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/* $OpenBSD: synch.h,v 1.2 2017/05/29 14:47:54 mpi Exp $ */
/*
* Copyright (c) 2017 Martin Pieuchot
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/atomic.h>
#include <sys/time.h>
#include <sys/futex.h>
REDIRECT_SYSCALL(futex);
static inline int
_wake(volatile uint32_t *p, int n)
{
return futex(p, FUTEX_WAKE, n, NULL, NULL);
}
static inline void
_wait(volatile uint32_t *p, int val)
{
while (*p != (uint32_t)val)
futex(p, FUTEX_WAIT, val, NULL, NULL);
}
static inline int
_twait(volatile uint32_t *p, int val, clockid_t clockid, const struct timespec *abs)
{
struct timespec rel;
if (abs == NULL)
return futex(p, FUTEX_WAIT, val, NULL, NULL);
if (abs->tv_nsec >= 1000000000 || clock_gettime(clockid, &rel))
return (EINVAL);
rel.tv_sec = abs->tv_sec - rel.tv_sec;
if ((rel.tv_nsec = abs->tv_nsec - rel.tv_nsec) < 0) {
rel.tv_sec--;
rel.tv_nsec += 1000000000;
}
if (rel.tv_sec < 0)
return (ETIMEDOUT);
return futex(p, FUTEX_WAIT, val, &rel, NULL);
}
static inline int
_requeue(volatile uint32_t *p, int n, int m, volatile uint32_t *q)
{
return futex(p, FUTEX_REQUEUE, n, (void *)(long)m, q);
}
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