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annotate src/cdrom/macosx/SDLOSXCAGuard.h @ 4543:d7cdc25af9a2 SDL-1.2

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Better fix for bug 936
author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Jul 2010 10:28:57 -0700
parents a1b03ba2fcd0
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 #include "SDL_config.h"
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23
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24 /*
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25 Note: This file hasn't been modified so technically we have to keep the disclaimer :-(
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26
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27
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28 Copyright: © Copyright 2002 Apple Computer, Inc. All rights reserved.
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29
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30 Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
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31 ("Apple") in consideration of your agreement to the following terms, and your
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32 use, installation, modification or redistribution of this Apple software
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33 constitutes acceptance of these terms. If you do not agree with these terms,
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34 please do not use, install, modify or redistribute this Apple software.
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35
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36 In consideration of your agreement to abide by the following terms, and subject
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37 to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs
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38 copyrights in this original Apple software (the "Apple Software"), to use,
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39 reproduce, modify and redistribute the Apple Software, with or without
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40 modifications, in source and/or binary forms; provided that if you redistribute
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41 the Apple Software in its entirety and without modifications, you must retain
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42 this notice and the following text and disclaimers in all such redistributions of
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43 the Apple Software. Neither the name, trademarks, service marks or logos of
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44 Apple Computer, Inc. may be used to endorse or promote products derived from the
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45 Apple Software without specific prior written permission from Apple. Except as
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46 expressly stated in this notice, no other rights or licenses, express or implied,
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47 are granted by Apple herein, including but not limited to any patent rights that
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48 may be infringed by your derivative works or by other works in which the Apple
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49 Software may be incorporated.
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50
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51 The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
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52 WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
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53 WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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54 PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
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55 COMBINATION WITH YOUR PRODUCTS.
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56
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57 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
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58 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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59 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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60 ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
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61 OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
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62 (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
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63 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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64 */
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65 /*=============================================================================
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66 CAGuard.h
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67
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68 =============================================================================*/
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69 #if !defined(__CAGuard_h__)
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70 #define __CAGuard_h__
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71
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72 /*=============================================================================
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73 Includes
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74 =============================================================================*/
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75
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76 #include <CoreAudio/CoreAudioTypes.h>
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77 #include <pthread.h>
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78
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79
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80 /*=============================================================================
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81 CAGuard
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82
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83 This is your typical mutex with signalling implemented via pthreads.
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84 Lock() will return true if and only if the guard is locked on that call.
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85 A thread that already has the guard will receive 'false' if it locks it
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86 again. Use of the stack-based CAGuard::Locker class is highly recommended
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87 to properly manage the recursive nesting. The Wait calls with timeouts
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88 will return true if and only if the timeout period expired. They will
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89 return false if they receive notification any other way.
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90 =============================================================================*/
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91
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92 typedef struct S_SDLOSXCAGuard
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93 {
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94
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95 /* Construction/Destruction */
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96 /*public:*/
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97 /* Actions */
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98 /*public:*/
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99 int (*Lock)(struct S_SDLOSXCAGuard *cag);
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100 void (*Unlock)(struct S_SDLOSXCAGuard *cag);
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101 int (*Try)(struct S_SDLOSXCAGuard *cag, int *outWasLocked); /* returns true if lock is free, false if not */
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102 void (*Wait)(struct S_SDLOSXCAGuard *cag);
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103 void (*Notify)(struct S_SDLOSXCAGuard *cag);
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104
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105 /* Implementation */
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106 /*protected:*/
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107 pthread_mutex_t mMutex;
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108 pthread_cond_t mCondVar;
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109 pthread_t mOwner;
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110 } SDLOSXCAGuard;
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111
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112 SDLOSXCAGuard *new_SDLOSXCAGuard(void);
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113 void delete_SDLOSXCAGuard(SDLOSXCAGuard *cag);
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114
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115 #endif
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116