Mercurial > sdl-ios-xcode
annotate include/SDL_mutex.h @ 1230:88c2d6aed428
From Mike Frysinger and/or Gentoo:
- libsdl-PIC-load-mmx-masks-from-stack.patch
this one may be a little controversial ... the fix here is again that you cant
reference the memory addresses like this to load into a mmx register, so the
way to do it is to push two 32bit words onto the stack, load the 64bit value
off of the stack into the mmx register, and then adjust the stack so that
it's back to normal.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 05 Jan 2006 15:25:19 +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 */ |