source: rtems-libbsd/rtemsbsd/powerpc/include/linux/wait.h @ 0f1d2f6

/*-
 * Copyright (c) 2010 Isilon Systems, Inc.
 * Copyright (c) 2010 iX Systems, Inc.
 * Copyright (c) 2010 Panasas, Inc.
 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice unmodified, this list of conditions, and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD$
 */
#ifndef _LINUX_WAIT_H_
#define _LINUX_WAIT_H_

#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/list.h>

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sleepqueue.h>
#include <sys/kernel.h>
#include <sys/proc.h>

typedef struct {
} wait_queue_t;

typedef struct {
        unsigned int    wchan;
} wait_queue_head_t;

#define init_waitqueue_head(x) \
    do { } while (0)

#define DECLARE_WAIT_QUEUE_HEAD(x) wait_queue_head_t x = { 0 }

static inline void
__wake_up(wait_queue_head_t *q, int all)
{
        int wakeup_swapper;
        void *c;

        c = &q->wchan;
        sleepq_lock(c);
        if (all)
                wakeup_swapper = sleepq_broadcast(c, SLEEPQ_SLEEP, 0, 0);
        else
                wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0);
        sleepq_release(c);
        if (wakeup_swapper)
                kick_proc0();
}

#define wake_up(q)                              __wake_up(q, 0)
#define wake_up_nr(q, nr)                       __wake_up(q, 1)
#define wake_up_all(q)                          __wake_up(q, 1)
#define wake_up_interruptible(q)                __wake_up(q, 0)
#define wake_up_interruptible_nr(q, nr)         __wake_up(q, 1)
#define wake_up_interruptible_all(q, nr)        __wake_up(q, 1)

#define wait_event(q, cond)                                             \
do {                                                                    \
        void *c = &(q).wchan;                                           \
        if (!(cond)) {                                                  \
                for (;;) {                                              \
                        sleepq_lock(c);                                 \
                        if (cond) {                                     \
                                sleepq_release(c);                      \
                                break;                                  \
                        }                                               \
                        sleepq_add(c, NULL, "completion", SLEEPQ_SLEEP, 0); \
                        sleepq_wait(c, 0);                              \
                }                                                       \
        }                                                               \
} while (0)

#ifndef __rtems__
#define wait_event_interruptible(q, cond)                               \
({                                                                      \
        void *c = &(q).wchan;                                           \
        int _error;                                                     \
                                                                        \
        _error = 0;                                                     \
        if (!(cond)) {                                                  \
                for (; _error == 0;) {                                  \
                        sleepq_lock(c);                                 \
                        if (cond) {                                     \
                                sleepq_release(c);                      \
                                break;                                  \
                        }                                               \
                        sleepq_add(c, NULL, "completion",               \
                            SLEEPQ_SLEEP | SLEEPQ_INTERRUPTIBLE, 0);    \
                        if (sleepq_wait_sig(c, 0))                      \
                                _error = -ERESTARTSYS;                  \
                }                                                       \
        }                                                               \
        -_error;                                                        \
})
#else /* __rtems__ */
#define wait_event_interruptible(q, cond)                               \
({                                                                      \
        wait_event(q, cond);                                            \
        0;                                                              \
})
#endif /* __rtems__ */

static inline int
waitqueue_active(wait_queue_head_t *q)
{
        return 0;       /* XXX: not really implemented */
}

#define DEFINE_WAIT(name)       \
        wait_queue_t name = {}

static inline void
prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state)
{
}

static inline void
finish_wait(wait_queue_head_t *q, wait_queue_t *wait)
{
}

#endif  /* _LINUX_WAIT_H_ */