Mercurial > sdl-ios-xcode
annotate include/SDL_mutex.h @ 1204:f9794ee91dfc
Date: Tue, 13 Dec 2005 13:33:50 +0000
From: "alan buckley"
Subject: Patch to fix audio locking on RISC OS
When threads were not disabled on a RISC OS build
the audio mixer mutex was not created.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 13 Dec 2005 16:40:12 +0000 |
| parents | b8d311d90021 |
| children | 3bdcef7e1c90 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 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 | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #ifndef _SDL_mutex_h | |
| 29 #define _SDL_mutex_h | |
| 30 | |
| 31 /* Functions to provide thread synchronization primitives | |
| 32 | |
| 33 These are independent of the other SDL routines. | |
| 34 */ | |
| 35 | |
| 36 #include "SDL_main.h" | |
| 37 #include "SDL_types.h" | |
| 38 | |
| 39 #include "begin_code.h" | |
| 40 /* Set up for C function definitions, even when using C++ */ | |
| 41 #ifdef __cplusplus | |
| 42 extern "C" { | |
| 43 #endif | |
| 44 | |
| 45 /* Synchronization functions which can time out return this value | |
| 46 if they time out. | |
| 47 */ | |
| 48 #define SDL_MUTEX_TIMEDOUT 1 | |
| 49 | |
| 50 /* This is the timeout value which corresponds to never time out */ | |
| 51 #define SDL_MUTEX_MAXWAIT (~(Uint32)0) | |
| 52 | |
| 53 | |
| 54 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 55 /* Mutex functions */ | |
| 56 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 57 | |
| 58 /* The SDL mutex structure, defined in SDL_mutex.c */ | |
| 59 struct SDL_mutex; | |
| 60 typedef struct SDL_mutex SDL_mutex; | |
| 61 | |
| 62 /* Create a mutex, initialized unlocked */ | |
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63 extern DECLSPEC SDL_mutex * SDLCALL SDL_CreateMutex(void); |
| 0 | 64 |
| 65 /* Lock the mutex (Returns 0, or -1 on error) */ | |
| 66 #define SDL_LockMutex(m) SDL_mutexP(m) | |
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67 extern DECLSPEC int SDLCALL SDL_mutexP(SDL_mutex *mutex); |
| 0 | 68 |
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69 /* Unlock the mutex (Returns 0, or -1 on error) |
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70 It is an error to unlock a mutex that has not been locked by |
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71 the current thread, and doing so results in undefined behavior. |
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72 */ |
| 0 | 73 #define SDL_UnlockMutex(m) SDL_mutexV(m) |
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74 extern DECLSPEC int SDLCALL SDL_mutexV(SDL_mutex *mutex); |
| 0 | 75 |
| 76 /* Destroy a mutex */ | |
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77 extern DECLSPEC void SDLCALL SDL_DestroyMutex(SDL_mutex *mutex); |
| 0 | 78 |
| 79 | |
| 80 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 81 /* Semaphore functions */ | |
| 82 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 83 | |
| 84 /* The SDL semaphore structure, defined in SDL_sem.c */ | |
| 85 struct SDL_semaphore; | |
| 86 typedef struct SDL_semaphore SDL_sem; | |
| 87 | |
| 88 /* Create a semaphore, initialized with value, returns NULL on failure. */ | |
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89 extern DECLSPEC SDL_sem * SDLCALL SDL_CreateSemaphore(Uint32 initial_value); |
| 0 | 90 |
| 91 /* Destroy a semaphore */ | |
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92 extern DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem *sem); |
| 0 | 93 |
| 94 /* This function suspends the calling thread until the semaphore pointed | |
| 95 * to by sem has a positive count. It then atomically decreases the semaphore | |
| 96 * count. | |
| 97 */ | |
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98 extern DECLSPEC int SDLCALL SDL_SemWait(SDL_sem *sem); |
| 0 | 99 |
| 100 /* Non-blocking variant of SDL_SemWait(), returns 0 if the wait succeeds, | |
| 101 SDL_MUTEX_TIMEDOUT if the wait would block, and -1 on error. | |
| 102 */ | |
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103 extern DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem *sem); |
| 0 | 104 |
| 105 /* Variant of SDL_SemWait() with a timeout in milliseconds, returns 0 if | |
| 106 the wait succeeds, SDL_MUTEX_TIMEDOUT if the wait does not succeed in | |
| 107 the allotted time, and -1 on error. | |
| 108 On some platforms this function is implemented by looping with a delay | |
| 109 of 1 ms, and so should be avoided if possible. | |
| 110 */ | |
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111 extern DECLSPEC int SDLCALL SDL_SemWaitTimeout(SDL_sem *sem, Uint32 ms); |
| 0 | 112 |
| 113 /* Atomically increases the semaphore's count (not blocking), returns 0, | |
| 114 or -1 on error. | |
| 115 */ | |
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116 extern DECLSPEC int SDLCALL SDL_SemPost(SDL_sem *sem); |
| 0 | 117 |
| 118 /* Returns the current count of the semaphore */ | |
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119 extern DECLSPEC Uint32 SDLCALL SDL_SemValue(SDL_sem *sem); |
| 0 | 120 |
| 121 | |
| 122 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 123 /* Condition variable functions */ | |
| 124 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 125 | |
| 126 /* The SDL condition variable structure, defined in SDL_cond.c */ | |
| 127 struct SDL_cond; | |
| 128 typedef struct SDL_cond SDL_cond; | |
| 129 | |
| 130 /* Create a condition variable */ | |
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131 extern DECLSPEC SDL_cond * SDLCALL SDL_CreateCond(void); |
| 0 | 132 |
| 133 /* Destroy a condition variable */ | |
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134 extern DECLSPEC void SDLCALL SDL_DestroyCond(SDL_cond *cond); |
| 0 | 135 |
| 136 /* Restart one of the threads that are waiting on the condition variable, | |
| 137 returns 0 or -1 on error. | |
| 138 */ | |
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139 extern DECLSPEC int SDLCALL SDL_CondSignal(SDL_cond *cond); |
| 0 | 140 |
| 141 /* Restart all threads that are waiting on the condition variable, | |
| 142 returns 0 or -1 on error. | |
| 143 */ | |
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144 extern DECLSPEC int SDLCALL SDL_CondBroadcast(SDL_cond *cond); |
| 0 | 145 |
| 146 /* Wait on the condition variable, unlocking the provided mutex. | |
| 147 The mutex must be locked before entering this function! | |
| 148 Returns 0 when it is signaled, or -1 on error. | |
| 149 */ | |
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150 extern DECLSPEC int SDLCALL SDL_CondWait(SDL_cond *cond, SDL_mutex *mut); |
| 0 | 151 |
| 152 /* Waits for at most 'ms' milliseconds, and returns 0 if the condition | |
| 153 variable is signaled, SDL_MUTEX_TIMEDOUT if the condition is not | |
| 154 signaled in the allotted time, and -1 on error. | |
| 155 On some platforms this function is implemented by looping with a delay | |
| 156 of 1 ms, and so should be avoided if possible. | |
| 157 */ | |
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158 extern DECLSPEC int SDLCALL SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms); |
| 0 | 159 |
| 160 /* Ends C function definitions when using C++ */ | |
| 161 #ifdef __cplusplus | |
| 162 } | |
| 163 #endif | |
| 164 #include "close_code.h" | |
| 165 | |
| 166 #endif /* _SDL_mutex_h */ |