1/* $NetBSD: event.c,v 1.2.6.1 2012/06/05 21:15:06 bouyer Exp $ */ 2 3/* 4 * Copyright (C) 2004, 2005, 2007 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 37static void 38destroy(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 44isc_event_t * 45isc_event_allocate(isc_mem_t *mctx, void *sender, isc_eventtype_t type, 46 isc_taskaction_t action, const void *arg, size_t size) 47{ 48 isc_event_t *event; 49 void *deconst_arg; 50 51 REQUIRE(size >= sizeof(struct isc_event)); 52 REQUIRE(action != NULL); 53 54 event = isc_mem_get(mctx, size); 55 if (event == NULL) 56 return (NULL); 57 58 /* 59 * Removing the const attribute from "arg" is the best of two 60 * evils here. If the event->ev_arg member is made const, then 61 * it affects a great many users of the task/event subsystem 62 * which are not passing in an "arg" which starts its life as 63 * const. Changing isc_event_allocate() and isc_task_onshutdown() 64 * to not have "arg" prototyped as const (which is quite legitimate, 65 * because neither of those functions modify arg) can cause 66 * compiler whining anytime someone does want to use a const 67 * arg that they themselves never modify, such as with 68 * gcc -Wwrite-strings and using a string "arg". 69 */ 70 DE_CONST(arg, deconst_arg); 71 72 ISC_EVENT_INIT(event, size, 0, NULL, type, action, deconst_arg, 73 sender, destroy, mctx); 74 75 return (event); 76} 77 78void 79isc_event_free(isc_event_t **eventp) { 80 isc_event_t *event; 81 82 REQUIRE(eventp != NULL); 83 event = *eventp; 84 REQUIRE(event != NULL); 85 86 if (event->ev_destroy != NULL) 87 (event->ev_destroy)(event); 88 89 *eventp = NULL; 90} 91