/*
* Copyright (C) 1998-2001, 2004, 2005, 2007, 2014, 2016, 2017 Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
/* $Id: event.c,v 1.21 2007/06/19 23:47:17 tbox Exp $ */
/*!
* \file
* \author Principal Author: Bob Halley
*/
#include <config.h>
#include <isc/event.h>
#include <isc/mem.h>
#include <isc/util.h>
/***
*** Events.
***/
static void
destroy(isc_event_t *event) {
isc_mem_t *mctx = event->ev_destroy_arg;
isc_mem_put(mctx, event, event->ev_size);
}
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)
{
isc_event_t *event;
REQUIRE(size >= sizeof(struct isc_event));
REQUIRE(action != NULL);
event = isc_mem_get(mctx, size);
if (event == NULL)
return (NULL);
ISC_EVENT_INIT(event, size, 0, NULL, type, action, arg,
sender, destroy, mctx);
return (event);
}
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)
{
isc_event_t *event;
void *deconst_arg;
REQUIRE(size >= sizeof(struct isc_event));
REQUIRE(action != NULL);
event = isc_mem_get(mctx, size);
if (event == NULL)
return (NULL);
/*
* Removing the const attribute from "arg" is the best of two
* evils here. If the event->ev_arg member is made const, then
* it affects a great many users of the task/event subsystem
* which are not passing in an "arg" which starts its life as
* const. Changing isc_event_allocate() and isc_task_onshutdown()
* to not have "arg" prototyped as const (which is quite legitimate,
* because neither of those functions modify arg) can cause
* compiler whining anytime someone does want to use a const
* arg that they themselves never modify, such as with
* gcc -Wwrite-strings and using a string "arg".
*/
DE_CONST(arg, deconst_arg);
ISC_EVENT_INIT(event, size, 0, NULL, type, action, deconst_arg,
sender, destroy, mctx);
return (event);
}
void
isc_event_free(isc_event_t **eventp) {
isc_event_t *event;
REQUIRE(eventp != NULL);
event = *eventp;
REQUIRE(event != NULL);
REQUIRE(!ISC_LINK_LINKED(event, ev_link));
REQUIRE(!ISC_LINK_LINKED(event, ev_ratelink));
if (event->ev_destroy != NULL)
(event->ev_destroy)(event);
*eventp = NULL;
}