102 lines
3.7 KiB
C
102 lines
3.7 KiB
C
|
/* $NetBSD: defer-internal.h,v 1.1.1.1 2013/04/11 16:43:21 christos Exp $ */
|
||
|
|
/*
|
||
|
|
* 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_ */
|
||
|
|
|