third_party/libevent/event-internal.h

   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_ */