1/*
2    SDL - Simple DirectMedia Layer
3    Copyright (C) 1997-2012 Sam Lantinga
4
5    This library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Library General Public
7    License as published by the Free Software Foundation; either
8    version 2 of the License, or (at your option) any later version.
9
10    This library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Library General Public License for more details.
14
15    You should have received a copy of the GNU Library General Public
16    License along with this library; if not, write to the Free
17    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
19    Sam Lantinga
20    slouken@libsdl.org
21*/
22#include "SDL_config.h"
23
24/*
25    Note: This file hasn't been modified so technically we have to keep the disclaimer :-(
26
27
28    Copyright:  � Copyright 2002 Apple Computer, Inc. All rights reserved.
29
30    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.
31            ("Apple") in consideration of your agreement to the following terms, and your
32            use, installation, modification or redistribution of this Apple software
33            constitutes acceptance of these terms.  If you do not agree with these terms,
34            please do not use, install, modify or redistribute this Apple software.
35
36            In consideration of your agreement to abide by the following terms, and subject
37            to these terms, Apple grants you a personal, non-exclusive license, under Apple�s
38            copyrights in this original Apple software (the "Apple Software"), to use,
39            reproduce, modify and redistribute the Apple Software, with or without
40            modifications, in source and/or binary forms; provided that if you redistribute
41            the Apple Software in its entirety and without modifications, you must retain
42            this notice and the following text and disclaimers in all such redistributions of
43            the Apple Software.  Neither the name, trademarks, service marks or logos of
44            Apple Computer, Inc. may be used to endorse or promote products derived from the
45            Apple Software without specific prior written permission from Apple.  Except as
46            expressly stated in this notice, no other rights or licenses, express or implied,
47            are granted by Apple herein, including but not limited to any patent rights that
48            may be infringed by your derivative works or by other works in which the Apple
49            Software may be incorporated.
50
51            The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
52            WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
53            WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
54            PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
55            COMBINATION WITH YOUR PRODUCTS.
56
57            IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
58            CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
59            GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60            ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
61            OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
62            (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
63            ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
64*/
65/*=============================================================================
66    CAGuard.h
67
68=============================================================================*/
69#if !defined(__CAGuard_h__)
70#define __CAGuard_h__
71
72/*=============================================================================
73    Includes
74  =============================================================================*/
75
76#include <CoreAudio/CoreAudioTypes.h>
77#include <pthread.h>
78
79
80/*=============================================================================
81    CAGuard
82
83    This is your typical mutex with signalling implemented via pthreads.
84    Lock() will return true if and only if the guard is locked on that call.
85    A thread that already has the guard will receive 'false' if it locks it
86    again. Use of the stack-based CAGuard::Locker class is highly recommended
87    to properly manage the recursive nesting. The Wait calls with timeouts
88    will return true if and only if the timeout period expired. They will
89    return false if they receive notification any other way.
90  =============================================================================*/
91
92typedef struct S_SDLOSXCAGuard
93{
94
95/*  Construction/Destruction */
96/*public:*/
97/*  Actions */
98/*public:*/
99    int     (*Lock)(struct S_SDLOSXCAGuard *cag);
100    void    (*Unlock)(struct S_SDLOSXCAGuard *cag);
101    int     (*Try)(struct S_SDLOSXCAGuard *cag, int *outWasLocked);    /* returns true if lock is free, false if not */
102    void    (*Wait)(struct S_SDLOSXCAGuard *cag);
103    void    (*Notify)(struct S_SDLOSXCAGuard *cag);
104
105/*  Implementation */
106/*protected:*/
107    pthread_mutex_t mMutex;
108    pthread_cond_t  mCondVar;
109    pthread_t       mOwner;
110} SDLOSXCAGuard;
111
112SDLOSXCAGuard *new_SDLOSXCAGuard(void);
113void delete_SDLOSXCAGuard(SDLOSXCAGuard *cag);
114
115#endif
116
117