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