1 files changed, 117 insertions, 0 deletions
diff --git a/lib/isc/include/isc/event.h b/lib/isc/include/isc/event.h
new file mode 100644
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+++ b/lib/isc/include/isc/event.h
@@ -0,0 +1,117 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+/*! \file isc/event.h */
+
+#include <isc/lang.h>
+#include <isc/types.h>
+
+/*****
+***** Events.
+*****/
+
+typedef void (*isc_eventdestructor_t)(isc_event_t *);
+
+#define ISC_EVENT_COMMON(ltype)               \
+	size_t		      ev_size;        \
+	unsigned int	      ev_attributes;  \
+	void		     *ev_tag;         \
+	isc_eventtype_t	      ev_type;        \
+	isc_taskaction_t      ev_action;      \
+	void		     *ev_arg;         \
+	void		     *ev_sender;      \
+	isc_eventdestructor_t ev_destroy;     \
+	void		     *ev_destroy_arg; \
+	ISC_LINK(ltype) ev_link;              \
+	ISC_LINK(ltype) ev_ratelink
+
+/*%
+ * Attributes matching a mask of 0x000000ff are reserved for the task library's
+ * definition.  Attributes of 0xffffff00 may be used by the application
+ * or non-ISC libraries.
+ */
+#define ISC_EVENTATTR_NOPURGE 0x00000001
+
+/*%
+ * The ISC_EVENTATTR_CANCELED attribute is intended to indicate
+ * that an event is delivered as a result of a canceled operation
+ * rather than successful completion, by mutual agreement
+ * between the sender and receiver.  It is not set or used by
+ * the task system.
+ */
+#define ISC_EVENTATTR_CANCELED 0x00000002
+
+#define ISC_EVENT_INIT(event, sz, at, ta, ty, ac, ar, sn, df, da) \
+	do {                                                      \
+		(event)->ev_size = (sz);                          \
+		(event)->ev_attributes = (at);                    \
+		(event)->ev_tag = (ta);                           \
+		(event)->ev_type = (ty);                          \
+		(event)->ev_action = (ac);                        \
+		(event)->ev_arg = (ar);                           \
+		(event)->ev_sender = (sn);                        \
+		(event)->ev_destroy = (df);                       \
+		(event)->ev_destroy_arg = (da);                   \
+		ISC_LINK_INIT((event), ev_link);                  \
+		ISC_LINK_INIT((event), ev_ratelink);              \
+	} while (0)
+
+/*%
+ * This structure is public because "subclassing" it may be useful when
+ * defining new event types.
+ */
+struct isc_event {
+	ISC_EVENT_COMMON(struct isc_event);
+};
+
+#define ISC_EVENTTYPE_FIRSTEVENT 0x00000000
+#define ISC_EVENTTYPE_LASTEVENT	 0xffffffff
+
+#define ISC_EVENT_PTR(p) ((isc_event_t **)(void *)(p))
+
+ISC_LANG_BEGINDECLS
+
+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 *
+isc_event_constallocate(isc_mem_t *mctx, void *sender, isc_eventtype_t type,
+			isc_taskaction_t action, const void *arg, size_t size);
+/*%<
+ * Allocate an event structure.
+ *
+ * Allocate and initialize in a structure with initial elements
+ * defined by:
+ *
+ * \code
+ *	struct {
+ *		ISC_EVENT_COMMON(struct isc_event);
+ *		...
+ *	};
+ * \endcode
+ *
+ * Requires:
+ *\li	'size' >= sizeof(struct isc_event)
+ *\li	'action' to be non NULL
+ *
+ * Returns:
+ *\li	a pointer to a initialized structure of the requested size.
+ *\li	NULL if unable to allocate memory.
+ */
+
+void
+isc_event_free(isc_event_t **);
+
+ISC_LANG_ENDDECLS