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annotate src/cdrom/macosx/CAGuard.cpp @ 626:b98f732b4322

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author Sam Lantinga <slouken@libsdl.org>
date Thu, 29 May 2003 04:23:03 +0000
parents 9c6717a1c66f
children de1b2c3063b9
rev   line source
613
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 /*
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23 Note: This file hasn't been modified so technically we have to keep the disclaimer :-(
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24
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25 Copyright: © Copyright 2002 Apple Computer, Inc. All rights reserved.
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26
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27 Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
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28 ("Apple") in consideration of your agreement to the following terms, and your
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29 use, installation, modification or redistribution of this Apple software
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30 constitutes acceptance of these terms. If you do not agree with these terms,
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31 please do not use, install, modify or redistribute this Apple software.
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32
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33 In consideration of your agreement to abide by the following terms, and subject
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34 to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs
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35 copyrights in this original Apple software (the "Apple Software"), to use,
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36 reproduce, modify and redistribute the Apple Software, with or without
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37 modifications, in source and/or binary forms; provided that if you redistribute
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38 the Apple Software in its entirety and without modifications, you must retain
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39 this notice and the following text and disclaimers in all such redistributions of
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40 the Apple Software. Neither the name, trademarks, service marks or logos of
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41 Apple Computer, Inc. may be used to endorse or promote products derived from the
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42 Apple Software without specific prior written permission from Apple. Except as
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43 expressly stated in this notice, no other rights or licenses, express or implied,
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44 are granted by Apple herein, including but not limited to any patent rights that
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45 may be infringed by your derivative works or by other works in which the Apple
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46 Software may be incorporated.
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47
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48 The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
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49 WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
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50 WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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51 PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
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52 COMBINATION WITH YOUR PRODUCTS.
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53
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54 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
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55 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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56 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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57 ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
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58 OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
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59 (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
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60 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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61 */
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62 /*=============================================================================
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63 CAGuard.cp
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64
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65 =============================================================================*/
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66
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67 //=============================================================================
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68 // Includes
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69 //=============================================================================
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70
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71 #include <stdio.h>
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72
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73 #define NDEBUG 1
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74 #include <assert.h>
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75
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76
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77 #include "CAGuard.h"
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78
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79 //#warning Need a try-based Locker too
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80 //=============================================================================
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81 // CAGuard
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82 //=============================================================================
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83
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84 CAGuard::CAGuard()
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85 {
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86 OSStatus theError = pthread_mutex_init(&mMutex, NULL);
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87 assert(theError == 0);
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88
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89 theError = pthread_cond_init(&mCondVar, NULL);
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90 assert(theError == 0);
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91
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92 mOwner = 0;
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93 }
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94
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95 CAGuard::~CAGuard()
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96 {
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97 pthread_mutex_destroy(&mMutex);
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98 pthread_cond_destroy(&mCondVar);
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99 }
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100
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101 bool CAGuard::Lock()
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102 {
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103 bool theAnswer = false;
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104
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105 if(pthread_self() != mOwner)
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106 {
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107 OSStatus theError = pthread_mutex_lock(&mMutex);
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108 assert(theError == 0);
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109 mOwner = pthread_self();
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110 theAnswer = true;
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111 }
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112
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113 return theAnswer;
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114 }
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115
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116 void CAGuard::Unlock()
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117 {
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118 assert(pthread_self() == mOwner);
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119
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120 mOwner = 0;
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121 OSStatus theError = pthread_mutex_unlock(&mMutex);
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122 assert(theError == 0);
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123 }
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124
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125 bool CAGuard::Try (bool& outWasLocked)
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126 {
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127 bool theAnswer = false;
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128 outWasLocked = false;
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129
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130 if (pthread_self() == mOwner) {
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131 theAnswer = true;
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132 outWasLocked = false;
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133 } else {
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134 OSStatus theError = pthread_mutex_trylock(&mMutex);
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135 if (theError == 0) {
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136 mOwner = pthread_self();
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137 theAnswer = true;
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138 outWasLocked = true;
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139 }
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140 }
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141
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142 return theAnswer;
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143 }
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144
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145 void CAGuard::Wait()
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146 {
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147 assert(pthread_self() == mOwner);
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148
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149 mOwner = 0;
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150
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151 OSStatus theError = pthread_cond_wait(&mCondVar, &mMutex);
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152 assert(theError == 0);
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153 mOwner = pthread_self();
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154 }
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155
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156 void CAGuard::Notify()
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157 {
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158 OSStatus theError = pthread_cond_signal(&mCondVar);
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159 assert(theError == 0);
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160 }