condition.h revision 290001 
1/*
2 * Copyright (C) 2004, 2007  Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 2000, 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: condition.h,v 1.6 2007/06/19 23:47:18 tbox Exp $ */
19
20/*
21 * This provides a limited subset of the isc_condition_t
22 * functionality for use by single-threaded programs that
23 * need to block waiting for events.   Only a single
24 * call to isc_condition_wait() may be blocked at any given
25 * time, and the _waituntil and _broadcast functions are not
26 * supported.  This is intended primarily for use by the omapi
27 * library, and may go away once omapi goes away.  Use for
28 * other purposes is strongly discouraged.
29 */
30
31#ifndef ISC_CONDITION_H
32#define ISC_CONDITION_H 1
33
34#include <isc/mutex.h>
35
36typedef int isc_condition_t;
37
38isc_result_t isc__nothread_wait_hack(isc_condition_t *cp, isc_mutex_t *mp);
39isc_result_t isc__nothread_signal_hack(isc_condition_t *cp);
40
41#define isc_condition_init(cp) \
42	(*(cp) = 0, ISC_R_SUCCESS)
43
44#define isc_condition_wait(cp, mp) \
45	isc__nothread_wait_hack(cp, mp)
46
47#define isc_condition_waituntil(cp, mp, tp) \
48	((void)(cp), (void)(mp), (void)(tp), ISC_R_NOTIMPLEMENTED)
49
50#define isc_condition_signal(cp) \
51	isc__nothread_signal_hack(cp)
52
53#define isc_condition_broadcast(cp) \
54	((void)(cp), ISC_R_NOTIMPLEMENTED)
55
56#define isc_condition_destroy(cp) \
57	(*(cp) == 0 ? (*(cp) = -1, ISC_R_SUCCESS) : ISC_R_UNEXPECTED)
58
59#endif /* ISC_CONDITION_H */
60