1 /* $NetBSD: event.c,v 1.5 2014/12/10 04:37:59 christos Exp $ */
2
3 /*
4 * Copyright (C) 2004, 2005, 2007, 2014 Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (C) 1998-2001 Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17 * PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 /* Id: event.c,v 1.21 2007/06/19 23:47:17 tbox Exp */
21
22 /*!
23 * \file
24 * \author Principal Author: Bob Halley
25 */
26
27 #include <config.h>
28
29 #include <isc/event.h>
30 #include <isc/mem.h>
31 #include <isc/util.h>
32
33 /***
34 *** Events.
35 ***/
36
37 static void
destroy(isc_event_t * event)38 destroy(isc_event_t *event) {
39 isc_mem_t *mctx = event->ev_destroy_arg;
40
41 isc_mem_put(mctx, event, event->ev_size);
42 }
43
44 isc_event_t *
isc_event_allocate(isc_mem_t * mctx,void * sender,isc_eventtype_t type,isc_taskaction_t action,void * arg,size_t size)45 isc_event_allocate(isc_mem_t *mctx, void *sender, isc_eventtype_t type,
46 isc_taskaction_t action, void *arg, size_t size)
47 {
48 isc_event_t *event;
49
50 REQUIRE(size >= sizeof(struct isc_event));
51 REQUIRE(action != NULL);
52
53 event = isc_mem_get(mctx, size);
54 if (event == NULL)
55 return (NULL);
56
57 ISC_EVENT_INIT(event, size, 0, NULL, type, action, arg,
58 sender, destroy, mctx);
59
60 return (event);
61 }
62
63 isc_event_t *
isc_event_constallocate(isc_mem_t * mctx,void * sender,isc_eventtype_t type,isc_taskaction_t action,const void * arg,size_t size)64 isc_event_constallocate(isc_mem_t *mctx, void *sender, isc_eventtype_t type,
65 isc_taskaction_t action, const void *arg, size_t size)
66 {
67 isc_event_t *event;
68 void *deconst_arg;
69
70 REQUIRE(size >= sizeof(struct isc_event));
71 REQUIRE(action != NULL);
72
73 event = isc_mem_get(mctx, size);
74 if (event == NULL)
75 return (NULL);
76
77 /*
78 * Removing the const attribute from "arg" is the best of two
79 * evils here. If the event->ev_arg member is made const, then
80 * it affects a great many users of the task/event subsystem
81 * which are not passing in an "arg" which starts its life as
82 * const. Changing isc_event_allocate() and isc_task_onshutdown()
83 * to not have "arg" prototyped as const (which is quite legitimate,
84 * because neither of those functions modify arg) can cause
85 * compiler whining anytime someone does want to use a const
86 * arg that they themselves never modify, such as with
87 * gcc -Wwrite-strings and using a string "arg".
88 */
89 DE_CONST(arg, deconst_arg);
90
91 ISC_EVENT_INIT(event, size, 0, NULL, type, action, deconst_arg,
92 sender, destroy, mctx);
93
94 return (event);
95 }
96
97 void
isc_event_free(isc_event_t ** eventp)98 isc_event_free(isc_event_t **eventp) {
99 isc_event_t *event;
100
101 REQUIRE(eventp != NULL);
102 event = *eventp;
103 REQUIRE(event != NULL);
104
105 if (event->ev_destroy != NULL)
106 (event->ev_destroy)(event);
107
108 *eventp = NULL;
109 }
110