lib/libevent/event-internal.h

   1 /*      $NetBSD$        */
   2 /*
   3  * Copyright (c) 2000-2004 Niels Provos <provos@citi.umich.edu>
   4  * All rights reserved.
   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 _EVENT_INTERNAL_H_
  29 #define _EVENT_INTERNAL_H_
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 #include "config.h"
  36 #include "min_heap.h"
  37 #include "evsignal.h"
  38
  39 struct eventop {
  40         const char *name;
  41         void *(*init)(struct event_base *);
  42         int (*add)(void *, struct event *);
  43         int (*del)(void *, struct event *);
  44         int (*dispatch)(struct event_base *, void *, struct timeval *);
  45         void (*dealloc)(struct event_base *, void *);
  46         /* set if we need to reinitialize the event base */
  47         int need_reinit;
  48 };
  49
  50 struct event_base {
  51         const struct eventop *evsel;
  52         void *evbase;
  53         int event_count;                /* counts number of total events */
  54         int event_count_active; /* counts number of active events */
  55
  56         int event_gotterm;              /* Set to terminate loop */
  57         int event_break;                /* Set to terminate loop immediately */
  58
  59         /* active event management */
  60         struct event_list **activequeues;
  61         int nactivequeues;
  62
  63         /* signal handling info */
  64         struct evsignal_info sig;
  65
  66         struct event_list eventqueue;
  67         struct timeval event_tv;
  68
  69         struct min_heap timeheap;
  70
  71         struct timeval tv_cache;
  72 };
  73
  74 /* Internal use only: Functions that might be missing from <sys/queue.h> */
  75 #ifndef HAVE_TAILQFOREACH
  76 #define TAILQ_FIRST(head)               ((head)->tqh_first)
  77 #define TAILQ_END(head)                 NULL
  78 #define TAILQ_NEXT(elm, field)          ((elm)->field.tqe_next)
  79 #define TAILQ_FOREACH(var, head, field)                                 \
  80         for((var) = TAILQ_FIRST(head);                                  \
  81             (var) != TAILQ_END(head);                                   \
  82             (var) = TAILQ_NEXT(var, field))
  83 #define TAILQ_INSERT_BEFORE(listelm, elm, field) do {                   \
  84         (elm)->field.tqe_prev = (listelm)->field.tqe_prev;              \
  85         (elm)->field.tqe_next = (listelm);                              \
  86         *(listelm)->field.tqe_prev = (elm);                             \
  87         (listelm)->field.tqe_prev = &(elm)->field.tqe_next;             \
  88 } while (0)
  89 #endif /* TAILQ_FOREACH */
  90
  91 int _evsignal_set_handler(struct event_base *base, int evsignal,
  92                           void (*fn)(int));
  93 int _evsignal_restore_handler(struct event_base *base, int evsignal);
  94
  95 #ifdef __cplusplus
  96 }
  97 #endif
  98
  99 #endif /* _EVENT_INTERNAL_H_ */