1/*
2 * Copyright (C) 2004, 2007-2009  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: mutex.h,v 1.22 2009/01/18 23:48:14 tbox Exp $ */
19
20#ifndef ISC_MUTEX_H
21#define ISC_MUTEX_H 1
22
23#include <isc/net.h>
24#include <windows.h>
25
26#include <isc/result.h>
27
28typedef CRITICAL_SECTION isc_mutex_t;
29
30/*
31 * This definition is here since some versions of WINBASE.H
32 * omits it for some reason.
33 */
34#if (_WIN32_WINNT < 0x0400)
35WINBASEAPI BOOL WINAPI
36TryEnterCriticalSection(LPCRITICAL_SECTION lpCriticalSection);
37#endif /* _WIN32_WINNT < 0x0400 */
38
39#define isc_mutex_init(mp) \
40	(InitializeCriticalSection((mp)), ISC_R_SUCCESS)
41#define isc_mutex_lock(mp) \
42	(EnterCriticalSection((mp)), ISC_R_SUCCESS)
43#define isc_mutex_unlock(mp) \
44	(LeaveCriticalSection((mp)), ISC_R_SUCCESS)
45#define isc_mutex_trylock(mp) \
46	(TryEnterCriticalSection((mp)) ? ISC_R_SUCCESS : ISC_R_LOCKBUSY)
47#define isc_mutex_destroy(mp) \
48	(DeleteCriticalSection((mp)), ISC_R_SUCCESS)
49
50/*
51 * This is a placeholder for now since we are not keeping any mutex stats
52 */
53#define isc_mutex_stats(fp) do {} while (0)
54
55#endif /* ISC_MUTEX_H */
56