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comparison src/cdrom/macosx/CAGuard.cpp @ 613:9c6717a1c66f

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Added MacOS X CD-ROM audio support (thanks Max and Darrell)
author Sam Lantinga <slouken@libsdl.org>
date Tue, 15 Apr 2003 16:33:56 +0000
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612:0648505b1f8b 613:9c6717a1c66f
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 /*
23 Note: This file hasn't been modified so technically we have to keep the disclaimer :-(
24
25 Copyright: © Copyright 2002 Apple Computer, Inc. All rights reserved.
26
27 Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
28 ("Apple") in consideration of your agreement to the following terms, and your
29 use, installation, modification or redistribution of this Apple software
30 constitutes acceptance of these terms. If you do not agree with these terms,
31 please do not use, install, modify or redistribute this Apple software.
32
33 In consideration of your agreement to abide by the following terms, and subject
34 to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs
35 copyrights in this original Apple software (the "Apple Software"), to use,
36 reproduce, modify and redistribute the Apple Software, with or without
37 modifications, in source and/or binary forms; provided that if you redistribute
38 the Apple Software in its entirety and without modifications, you must retain
39 this notice and the following text and disclaimers in all such redistributions of
40 the Apple Software. Neither the name, trademarks, service marks or logos of
41 Apple Computer, Inc. may be used to endorse or promote products derived from the
42 Apple Software without specific prior written permission from Apple. Except as
43 expressly stated in this notice, no other rights or licenses, express or implied,
44 are granted by Apple herein, including but not limited to any patent rights that
45 may be infringed by your derivative works or by other works in which the Apple
46 Software may be incorporated.
47
48 The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
49 WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
50 WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
51 PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
52 COMBINATION WITH YOUR PRODUCTS.
53
54 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
55 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
56 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
58 OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
59 (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
60 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 */
62 /*=============================================================================
63 CAGuard.cp
64
65 =============================================================================*/
66
67 //=============================================================================
68 // Includes
69 //=============================================================================
70
71 #include <stdio.h>
72
73 #define NDEBUG 1
74 #include <assert.h>
75
76
77 #include "CAGuard.h"
78
79 //#warning Need a try-based Locker too
80 //=============================================================================
81 // CAGuard
82 //=============================================================================
83
84 CAGuard::CAGuard()
85 {
86 OSStatus theError = pthread_mutex_init(&mMutex, NULL);
87 assert(theError == 0);
88
89 theError = pthread_cond_init(&mCondVar, NULL);
90 assert(theError == 0);
91
92 mOwner = 0;
93 }
94
95 CAGuard::~CAGuard()
96 {
97 pthread_mutex_destroy(&mMutex);
98 pthread_cond_destroy(&mCondVar);
99 }
100
101 bool CAGuard::Lock()
102 {
103 bool theAnswer = false;
104
105 if(pthread_self() != mOwner)
106 {
107 OSStatus theError = pthread_mutex_lock(&mMutex);
108 assert(theError == 0);
109 mOwner = pthread_self();
110 theAnswer = true;
111 }
112
113 return theAnswer;
114 }
115
116 void CAGuard::Unlock()
117 {
118 assert(pthread_self() == mOwner);
119
120 mOwner = 0;
121 OSStatus theError = pthread_mutex_unlock(&mMutex);
122 assert(theError == 0);
123 }
124
125 bool CAGuard::Try (bool& outWasLocked)
126 {
127 bool theAnswer = false;
128 outWasLocked = false;
129
130 if (pthread_self() == mOwner) {
131 theAnswer = true;
132 outWasLocked = false;
133 } else {
134 OSStatus theError = pthread_mutex_trylock(&mMutex);
135 if (theError == 0) {
136 mOwner = pthread_self();
137 theAnswer = true;
138 outWasLocked = true;
139 }
140 }
141
142 return theAnswer;
143 }
144
145 void CAGuard::Wait()
146 {
147 assert(pthread_self() == mOwner);
148
149 mOwner = 0;
150
151 OSStatus theError = pthread_cond_wait(&mCondVar, &mMutex);
152 assert(theError == 0);
153 mOwner = pthread_self();
154 }
155
156 void CAGuard::Notify()
157 {
158 OSStatus theError = pthread_cond_signal(&mCondVar);
159 assert(theError == 0);
160 }