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-rw-r--r--lib/isc/event.c95
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+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * 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 https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*!
+ * \file
+ */
+
+#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);
+
+ 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);
+
+ /*
+ * 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;
+ *eventp = NULL;
+ 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);
+ }
+}