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annotate src/cdrom/macosx/CAGuard.h @ 636:d9c2ab142f2f

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author Sam Lantinga <slouken@libsdl.org>
date Sat, 28 Jun 2003 17:03:57 +0000
parents 9c6717a1c66f
children b8d311d90021
rev   line source
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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
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26 Copyright: © Copyright 2002 Apple Computer, Inc. All rights reserved.
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27
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28 Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
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29 ("Apple") in consideration of your agreement to the following terms, and your
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30 use, installation, modification or redistribution of this Apple software
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31 constitutes acceptance of these terms. If you do not agree with these terms,
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32 please do not use, install, modify or redistribute this Apple software.
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33
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34 In consideration of your agreement to abide by the following terms, and subject
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35 to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs
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36 copyrights in this original Apple software (the "Apple Software"), to use,
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37 reproduce, modify and redistribute the Apple Software, with or without
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38 modifications, in source and/or binary forms; provided that if you redistribute
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39 the Apple Software in its entirety and without modifications, you must retain
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40 this notice and the following text and disclaimers in all such redistributions of
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41 the Apple Software. Neither the name, trademarks, service marks or logos of
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42 Apple Computer, Inc. may be used to endorse or promote products derived from the
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43 Apple Software without specific prior written permission from Apple. Except as
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44 expressly stated in this notice, no other rights or licenses, express or implied,
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45 are granted by Apple herein, including but not limited to any patent rights that
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46 may be infringed by your derivative works or by other works in which the Apple
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47 Software may be incorporated.
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48
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49 The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
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50 WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
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51 WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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52 PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
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53 COMBINATION WITH YOUR PRODUCTS.
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54
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55 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
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56 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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57 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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58 ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
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59 OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
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60 (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
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61 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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62 */
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63 /*=============================================================================
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64 CAGuard.h
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65
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66 =============================================================================*/
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67 #if !defined(__CAGuard_h__)
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68 #define __CAGuard_h__
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69
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70 //=============================================================================
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71 // Includes
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72 //=============================================================================
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73
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74 #include <CoreAudio/CoreAudioTypes.h>
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75 #include <pthread.h>
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76
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77
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78 //=============================================================================
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79 // CAGuard
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80 //
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81 // This is your typical mutex with signalling implemented via pthreads.
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82 // Lock() will return true if and only if the guard is locked on that call.
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83 // A thread that already has the guard will receive 'false' if it locks it
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84 // again. Use of the stack-based CAGuard::Locker class is highly recommended
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85 // to properly manage the recursive nesting. The Wait calls with timeouts
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86 // will return true if and only if the timeout period expired. They will
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87 // return false if they receive notification any other way.
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88 //=============================================================================
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89
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90 class CAGuard
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91 {
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92
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93 // Construction/Destruction
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94 public:
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95 CAGuard();
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96 virtual ~CAGuard();
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97
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98 // Actions
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99 public:
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100 virtual bool Lock();
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101 virtual void Unlock();
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102 virtual bool Try(bool& outWasLocked); // returns true if lock is free, false if not
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103
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104 virtual void Wait();
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105
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106 virtual void Notify();
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107
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108 // Implementation
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109 protected:
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110 pthread_mutex_t mMutex;
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111 pthread_cond_t mCondVar;
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112 pthread_t mOwner;
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113
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114 // Helper class to manage taking and releasing recursively
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115 public:
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116 class Locker
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117 {
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118
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119 // Construction/Destruction
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120 public:
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121 Locker(CAGuard& inGuard) : mGuard(inGuard), mNeedsRelease(false) { mNeedsRelease = mGuard.Lock(); }
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122 ~Locker() { if(mNeedsRelease) { mGuard.Unlock(); } }
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123
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124 private:
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125 Locker(const Locker&);
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126 Locker& operator=(const Locker&);
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127
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128 // Actions
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129 public:
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130 void Wait() { mGuard.Wait(); }
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131
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132 void Notify() { mGuard.Notify(); }
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133
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134 // Implementation
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135 private:
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136 CAGuard& mGuard;
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137 bool mNeedsRelease;
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138
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139 };
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140
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141 };
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142
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143 #endif