1/*	$NetBSD: defer-internal.h,v 1.5 2020/05/25 20:47:33 christos Exp $	*/
2
3/*
4 * Copyright (c) 2009-2012 Niels Provos and Nick Mathewson
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28#ifndef DEFER_INTERNAL_H_INCLUDED_
29#define DEFER_INTERNAL_H_INCLUDED_
30
31#ifdef __cplusplus
32extern "C" {
33#endif
34
35#include "event2/event-config.h"
36#include "evconfig-private.h"
37
38#include <sys/queue.h>
39
40struct event_callback;
41typedef void (*deferred_cb_fn)(struct event_callback *, void *);
42
43/**
44   Initialize an empty, non-pending event_callback.
45
46   @param deferred The struct event_callback structure to initialize.
47   @param priority The priority that the callback should run at.
48   @param cb The function to run when the struct event_callback executes.
49   @param arg The function's second argument.
50 */
51void event_deferred_cb_init_(struct event_callback *, ev_uint8_t, deferred_cb_fn, void *);
52/**
53   Change the priority of a non-pending event_callback.
54 */
55void event_deferred_cb_set_priority_(struct event_callback *, ev_uint8_t);
56/**
57   Cancel a struct event_callback if it is currently scheduled in an event_base.
58 */
59void event_deferred_cb_cancel_(struct event_base *, struct event_callback *);
60/**
61   Activate a struct event_callback if it is not currently scheduled in an event_base.
62
63   Return true iff it was not previously scheduled.
64 */
65int event_deferred_cb_schedule_(struct event_base *, struct event_callback *);
66
67#ifdef __cplusplus
68}
69#endif
70
71#endif /* EVENT_INTERNAL_H_INCLUDED_ */
72
73