1 /* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2004 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 (at) 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 Apples 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 92 typedef 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; 111 112 SDLOSXCAGuard *new_SDLOSXCAGuard(void); 113 void delete_SDLOSXCAGuard(SDLOSXCAGuard *cag); 114 115 #endif 116 117
