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/*
* Copyright (c) 2009-2012 Niels Provos and Nick Mathewson
*
* 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, 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
#ifndef _DEFER_INTERNAL_H_
#define _DEFER_INTERNAL_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "event2/event-config.h"
#include <sys/queue.h>
struct deferred_cb;
typedef void (*deferred_cb_fn)(struct deferred_cb *, void *);
/** A deferred_cb is a callback that can be scheduled to run as part of
* an event_base's event_loop, rather than running immediately. */
struct deferred_cb {
/** Links to the adjacent active (pending) deferred_cb objects. */
TAILQ_ENTRY (deferred_cb) cb_next;
/** True iff this deferred_cb is pending in an event_base. */
unsigned queued : 1;
/** The function to execute when the callback runs. */
deferred_cb_fn cb;
/** The function's second argument. */
void *arg;
};
/** A deferred_cb_queue is a list of deferred_cb that we can add to and run. */
struct deferred_cb_queue {
/** Lock used to protect the queue. */
void *lock;
/** How many entries are in the queue? */
int active_count;
/** Function called when adding to the queue from another thread. */
void (*notify_fn)(struct deferred_cb_queue *, void *);
void *notify_arg;
/** Deferred callback management: a list of deferred callbacks to
* run active the active events. */
TAILQ_HEAD (deferred_cb_list, deferred_cb) deferred_cb_list;
};
/**
Initialize an empty, non-pending deferred_cb.
@param deferred The deferred_cb structure to initialize.
@param cb The function to run when the deferred_cb executes.
@param arg The function's second argument.
*/
void event_deferred_cb_init(struct deferred_cb *, deferred_cb_fn, void *);
/**
Cancel a deferred_cb if it is currently scheduled in an event_base.
*/
void event_deferred_cb_cancel(struct deferred_cb_queue *, struct deferred_cb *);
/**
Activate a deferred_cb if it is not currently scheduled in an event_base.
*/
void event_deferred_cb_schedule(struct deferred_cb_queue *, struct deferred_cb *);
#define LOCK_DEFERRED_QUEUE(q) \
EVLOCK_LOCK((q)->lock, 0)
#define UNLOCK_DEFERRED_QUEUE(q) \
EVLOCK_UNLOCK((q)->lock, 0)
#ifdef __cplusplus
}
#endif
void event_deferred_cb_queue_init(struct deferred_cb_queue *);
struct deferred_cb_queue *event_base_get_deferred_cb_queue(struct event_base *);
#endif /* _EVENT_INTERNAL_H_ */
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