Mercurial > sdl-ios-xcode
annotate include/SDL_mutex.h @ 386:2c5d4c22a2ac
Added a README for Qtopia
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 01 Jun 2002 18:43:51 +0000 |
| parents | 9154ec9ca3d2 |
| children | 04ec6995f75d |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 |
| 69 /* Unlock the mutex (Returns 0, or -1 on error) */ | |
| 70 #define SDL_UnlockMutex(m) SDL_mutexV(m) | |
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71 extern DECLSPEC int SDLCALL SDL_mutexV(SDL_mutex *mutex); |
| 0 | 72 |
| 73 /* Destroy a mutex */ | |
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74 extern DECLSPEC void SDLCALL SDL_DestroyMutex(SDL_mutex *mutex); |
| 0 | 75 |
| 76 | |
| 77 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 78 /* Semaphore functions */ | |
| 79 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 80 | |
| 81 /* The SDL semaphore structure, defined in SDL_sem.c */ | |
| 82 struct SDL_semaphore; | |
| 83 typedef struct SDL_semaphore SDL_sem; | |
| 84 | |
| 85 /* Create a semaphore, initialized with value, returns NULL on failure. */ | |
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86 extern DECLSPEC SDL_sem * SDLCALL SDL_CreateSemaphore(Uint32 initial_value); |
| 0 | 87 |
| 88 /* Destroy a semaphore */ | |
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89 extern DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem *sem); |
| 0 | 90 |
| 91 /* This function suspends the calling thread until the semaphore pointed | |
| 92 * to by sem has a positive count. It then atomically decreases the semaphore | |
| 93 * count. | |
| 94 */ | |
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95 extern DECLSPEC int SDLCALL SDL_SemWait(SDL_sem *sem); |
| 0 | 96 |
| 97 /* Non-blocking variant of SDL_SemWait(), returns 0 if the wait succeeds, | |
| 98 SDL_MUTEX_TIMEDOUT if the wait would block, and -1 on error. | |
| 99 */ | |
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100 extern DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem *sem); |
| 0 | 101 |
| 102 /* Variant of SDL_SemWait() with a timeout in milliseconds, returns 0 if | |
| 103 the wait succeeds, SDL_MUTEX_TIMEDOUT if the wait does not succeed in | |
| 104 the allotted time, and -1 on error. | |
| 105 On some platforms this function is implemented by looping with a delay | |
| 106 of 1 ms, and so should be avoided if possible. | |
| 107 */ | |
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108 extern DECLSPEC int SDLCALL SDL_SemWaitTimeout(SDL_sem *sem, Uint32 ms); |
| 0 | 109 |
| 110 /* Atomically increases the semaphore's count (not blocking), returns 0, | |
| 111 or -1 on error. | |
| 112 */ | |
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113 extern DECLSPEC int SDLCALL SDL_SemPost(SDL_sem *sem); |
| 0 | 114 |
| 115 /* Returns the current count of the semaphore */ | |
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116 extern DECLSPEC Uint32 SDLCALL SDL_SemValue(SDL_sem *sem); |
| 0 | 117 |
| 118 | |
| 119 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 120 /* Condition variable functions */ | |
| 121 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 122 | |
| 123 /* The SDL condition variable structure, defined in SDL_cond.c */ | |
| 124 struct SDL_cond; | |
| 125 typedef struct SDL_cond SDL_cond; | |
| 126 | |
| 127 /* Create a condition variable */ | |
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128 extern DECLSPEC SDL_cond * SDLCALL SDL_CreateCond(void); |
| 0 | 129 |
| 130 /* Destroy a condition variable */ | |
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131 extern DECLSPEC void SDLCALL SDL_DestroyCond(SDL_cond *cond); |
| 0 | 132 |
| 133 /* Restart one of the threads that are waiting on the condition variable, | |
| 134 returns 0 or -1 on error. | |
| 135 */ | |
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136 extern DECLSPEC int SDLCALL SDL_CondSignal(SDL_cond *cond); |
| 0 | 137 |
| 138 /* Restart all threads that are waiting on the condition variable, | |
| 139 returns 0 or -1 on error. | |
| 140 */ | |
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141 extern DECLSPEC int SDLCALL SDL_CondBroadcast(SDL_cond *cond); |
| 0 | 142 |
| 143 /* Wait on the condition variable, unlocking the provided mutex. | |
| 144 The mutex must be locked before entering this function! | |
| 145 Returns 0 when it is signaled, or -1 on error. | |
| 146 */ | |
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147 extern DECLSPEC int SDLCALL SDL_CondWait(SDL_cond *cond, SDL_mutex *mut); |
| 0 | 148 |
| 149 /* Waits for at most 'ms' milliseconds, and returns 0 if the condition | |
| 150 variable is signaled, SDL_MUTEX_TIMEDOUT if the condition is not | |
| 151 signaled in the allotted time, and -1 on error. | |
| 152 On some platforms this function is implemented by looping with a delay | |
| 153 of 1 ms, and so should be avoided if possible. | |
| 154 */ | |
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155 extern DECLSPEC int SDLCALL SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms); |
| 0 | 156 |
| 157 /* Ends C function definitions when using C++ */ | |
| 158 #ifdef __cplusplus | |
| 159 } | |
| 160 #endif | |
| 161 #include "close_code.h" | |
| 162 | |
| 163 #endif /* _SDL_mutex_h */ |