1/*	$NetBSD$	*/
2
3/*
4 * Copyright (C) 2004, 2007  Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (C) 2000, 2001  Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
13 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17 * PERFORMANCE OF THIS SOFTWARE.
18 */
19
20/* Id: condition.h,v 1.6 2007/06/19 23:47:18 tbox Exp  */
21
22/*
23 * This provides a limited subset of the isc_condition_t
24 * functionality for use by single-threaded programs that
25 * need to block waiting for events.   Only a single
26 * call to isc_condition_wait() may be blocked at any given
27 * time, and the _waituntil and _broadcast functions are not
28 * supported.  This is intended primarily for use by the omapi
29 * library, and may go away once omapi goes away.  Use for
30 * other purposes is strongly discouraged.
31 */
32
33#ifndef ISC_CONDITION_H
34#define ISC_CONDITION_H 1
35
36#include <isc/mutex.h>
37
38typedef int isc_condition_t;
39
40isc_result_t isc__nothread_wait_hack(isc_condition_t *cp, isc_mutex_t *mp);
41isc_result_t isc__nothread_signal_hack(isc_condition_t *cp);
42
43#define isc_condition_init(cp) \
44	(*(cp) = 0, ISC_R_SUCCESS)
45
46#define isc_condition_wait(cp, mp) \
47	isc__nothread_wait_hack(cp, mp)
48
49#define isc_condition_waituntil(cp, mp, tp) \
50	((void)(cp), (void)(mp), (void)(tp), ISC_R_NOTIMPLEMENTED)
51
52#define isc_condition_signal(cp) \
53	isc__nothread_signal_hack(cp)
54
55#define isc_condition_broadcast(cp) \
56	((void)(cp), ISC_R_NOTIMPLEMENTED)
57
58#define isc_condition_destroy(cp) \
59	(*(cp) == 0 ? (*(cp) = -1, ISC_R_SUCCESS) : ISC_R_UNEXPECTED)
60
61#endif /* ISC_CONDITION_H */
62