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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
31 extern "C" {
32 #endif
33 
34 #include "config.h"
35 #include "min_heap.h"
36 #include "evsignal.h"
37 
38 struct 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 
49 struct 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 
90 int _evsignal_set_handler(struct event_base *base, int evsignal,
91 			  void (*fn)(int));
92 int _evsignal_restore_handler(struct event_base *base, int evsignal);
93 
94 /* defined in evutil.c */
95 const char *evutil_getenv(const char *varname);
96 
97 #ifdef __cplusplus
98 }
99 #endif
100 
101 #endif /* _EVENT_INTERNAL_H_ */
102