defer-internal.h

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