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Annotation of embedaddon/ntp/lib/isc/event.c, revision 1.1.1.1

1.1       misho       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: 
                     35: static void
                     36: destroy(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: 
                     42: isc_event_t *
                     43: isc_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: 
                     76: void
                     77: isc_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: }