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/* $OpenBSD: completion.h,v 1.2 2019/04/23 13:35:12 visa Exp $ */
/*
* Copyright (c) 2015, 2018 Mark Kettenis
*
* 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.
*/
#ifndef _LINUX_COMPLETION_H
#define _LINUX_COMPLETION_H
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mutex.h>
#include <linux/wait.h>
struct completion {
u_int done;
wait_queue_head_t wait;
};
static inline void
init_completion(struct completion *x)
{
x->done = 0;
mtx_init(&x->wait.lock, IPL_TTY);
}
static inline u_long
wait_for_completion_timeout(struct completion *x, u_long timo)
{
int ret;
KASSERT(!cold);
mtx_enter(&x->wait.lock);
while (x->done == 0) {
ret = msleep(x, &x->wait.lock, 0, "wfct", timo);
if (ret) {
mtx_leave(&x->wait.lock);
return (ret == EWOULDBLOCK) ? 0 : -ret;
}
}
x->done--;
mtx_leave(&x->wait.lock);
return 1;
}
static inline u_long
wait_for_completion_interruptible(struct completion *x)
{
int ret;
KASSERT(!cold);
mtx_enter(&x->wait.lock);
while (x->done == 0) {
ret = msleep(x, &x->wait.lock, PCATCH, "wfci", 0);
if (ret) {
mtx_leave(&x->wait.lock);
return (ret == EWOULDBLOCK) ? 0 : -ret;
}
}
x->done--;
mtx_leave(&x->wait.lock);
return 0;
}
static inline u_long
wait_for_completion_interruptible_timeout(struct completion *x, u_long timo)
{
int ret;
KASSERT(!cold);
mtx_enter(&x->wait.lock);
while (x->done == 0) {
ret = msleep(x, &x->wait.lock, PCATCH, "wfcit", timo);
if (ret) {
mtx_leave(&x->wait.lock);
return (ret == EWOULDBLOCK) ? 0 : -ret;
}
}
x->done--;
mtx_leave(&x->wait.lock);
return 1;
}
static inline void
complete_all(struct completion *x)
{
mtx_enter(&x->wait.lock);
x->done = UINT_MAX;
mtx_leave(&x->wait.lock);
wakeup(x);
}
static inline bool
try_wait_for_completion(struct completion *x)
{
mtx_enter(&x->wait.lock);
if (x->done == 0) {
mtx_leave(&x->wait.lock);
return false;
}
x->done--;
mtx_leave(&x->wait.lock);
return true;
}
#endif
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