1/*
2 * Copyright (c) 2000-2004 Niels Provos <provos@citi.umich.edu>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 *    derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27#ifndef _EVENT_INTERNAL_H_
28#define _EVENT_INTERNAL_H_
29
30#ifdef __cplusplus
31extern "C" {
32#endif
33
34#include "config.h"
35#include "min_heap.h"
36#include "evsignal.h"
37
38struct eventop {
39	const char *name;
40	void *(*init)(struct event_base *);
41	int (*add)(void *, struct event *);
42	int (*del)(void *, struct event *);
43	int (*dispatch)(struct event_base *, void *, struct timeval *);
44	void (*dealloc)(struct event_base *, void *);
45	/* set if we need to reinitialize the event base */
46	int need_reinit;
47};
48
49struct event_base {
50	const struct eventop *evsel;
51	void *evbase;
52	int event_count;		/* counts number of total events */
53	int event_count_active;	/* counts number of active events */
54
55	int event_gotterm;		/* Set to terminate loop */
56	int event_break;		/* Set to terminate loop immediately */
57
58	/* active event management */
59	struct event_list **activequeues;
60	int nactivequeues;
61
62	/* signal handling info */
63	struct evsignal_info sig;
64
65	struct event_list eventqueue;
66	struct timeval event_tv;
67
68	struct min_heap timeheap;
69
70	struct timeval tv_cache;
71};
72
73/* Internal use only: Functions that might be missing from <sys/queue.h> */
74#ifndef HAVE_TAILQFOREACH
75#define	TAILQ_FIRST(head)		((head)->tqh_first)
76#define	TAILQ_END(head)			NULL
77#define	TAILQ_NEXT(elm, field)		((elm)->field.tqe_next)
78#define TAILQ_FOREACH(var, head, field)					\
79	for((var) = TAILQ_FIRST(head);					\
80	    (var) != TAILQ_END(head);					\
81	    (var) = TAILQ_NEXT(var, field))
82#define	TAILQ_INSERT_BEFORE(listelm, elm, field) do {			\
83	(elm)->field.tqe_prev = (listelm)->field.tqe_prev;		\
84	(elm)->field.tqe_next = (listelm);				\
85	*(listelm)->field.tqe_prev = (elm);				\
86	(listelm)->field.tqe_prev = &(elm)->field.tqe_next;		\
87} while (0)
88#endif /* TAILQ_FOREACH */
89
90int _evsignal_set_handler(struct event_base *base, int evsignal,
91			  void (*fn)(int));
92int _evsignal_restore_handler(struct event_base *base, int evsignal);
93
94/* defined in evutil.c */
95const char *evutil_getenv(const char *varname);
96
97#ifdef __cplusplus
98}
99#endif
100
101#endif /* _EVENT_INTERNAL_H_ */
102