Mercurial > sdl-ios-xcode
annotate include/SDL_mutex.h @ 2247:93994f65c74c
Removed hermes since it's LGPL and not compatible with a commercial license.
Prepping for using MMX and SSE intrinsics instead of inline assembly.
.. except for memcpy equivalents which only get faster if they can
exploit the parallelism of loading into multiple SIMD registers. :)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 15 Aug 2007 08:21:10 +0000 |
| parents | c121d94672cb |
| children | 99210400e8b9 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 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 Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifndef _SDL_mutex_h | |
| 24 #define _SDL_mutex_h | |
| 25 | |
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26 /** |
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27 * \file SDL_mutex.h |
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28 * |
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29 * Functions to provide thread synchronization primitives |
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30 */ |
| 0 | 31 |
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32 #include "SDL_stdinc.h" |
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33 #include "SDL_error.h" |
| 0 | 34 |
| 35 #include "begin_code.h" | |
| 36 /* Set up for C function definitions, even when using C++ */ | |
| 37 #ifdef __cplusplus | |
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38 /* *INDENT-OFF* */ |
| 0 | 39 extern "C" { |
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40 /* *INDENT-ON* */ |
| 0 | 41 #endif |
| 42 | |
| 43 /* Synchronization functions which can time out return this value | |
| 44 if they time out. | |
| 45 */ | |
| 46 #define SDL_MUTEX_TIMEDOUT 1 | |
| 47 | |
| 48 /* This is the timeout value which corresponds to never time out */ | |
| 49 #define SDL_MUTEX_MAXWAIT (~(Uint32)0) | |
| 50 | |
| 51 | |
| 52 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 53 /* Mutex functions */ | |
| 54 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 55 | |
| 56 /* The SDL mutex structure, defined in SDL_mutex.c */ | |
| 57 struct SDL_mutex; | |
| 58 typedef struct SDL_mutex SDL_mutex; | |
| 59 | |
| 60 /* Create a mutex, initialized unlocked */ | |
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61 extern DECLSPEC SDL_mutex *SDLCALL SDL_CreateMutex(void); |
| 0 | 62 |
| 63 /* Lock the mutex (Returns 0, or -1 on error) */ | |
| 64 #define SDL_LockMutex(m) SDL_mutexP(m) | |
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65 extern DECLSPEC int SDLCALL SDL_mutexP(SDL_mutex * mutex); |
| 0 | 66 |
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67 /* Unlock the mutex (Returns 0, or -1 on error) |
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68 It is an error to unlock a mutex that has not been locked by |
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69 the current thread, and doing so results in undefined behavior. |
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70 */ |
| 0 | 71 #define SDL_UnlockMutex(m) SDL_mutexV(m) |
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72 extern DECLSPEC int SDLCALL SDL_mutexV(SDL_mutex * mutex); |
| 0 | 73 |
| 74 /* Destroy a mutex */ | |
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75 extern DECLSPEC void SDLCALL SDL_DestroyMutex(SDL_mutex * mutex); |
| 0 | 76 |
| 77 | |
| 78 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 79 /* Semaphore functions */ | |
| 80 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 81 | |
| 82 /* The SDL semaphore structure, defined in SDL_sem.c */ | |
| 83 struct SDL_semaphore; | |
| 84 typedef struct SDL_semaphore SDL_sem; | |
| 85 | |
| 86 /* Create a semaphore, initialized with value, returns NULL on failure. */ | |
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87 extern DECLSPEC SDL_sem *SDLCALL SDL_CreateSemaphore(Uint32 initial_value); |
| 0 | 88 |
| 89 /* Destroy a semaphore */ | |
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90 extern DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem * sem); |
| 0 | 91 |
| 92 /* This function suspends the calling thread until the semaphore pointed | |
| 93 * to by sem has a positive count. It then atomically decreases the semaphore | |
| 94 * count. | |
| 95 */ | |
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96 extern DECLSPEC int SDLCALL SDL_SemWait(SDL_sem * sem); |
| 0 | 97 |
| 98 /* Non-blocking variant of SDL_SemWait(), returns 0 if the wait succeeds, | |
| 99 SDL_MUTEX_TIMEDOUT if the wait would block, and -1 on error. | |
| 100 */ | |
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101 extern DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem * sem); |
| 0 | 102 |
| 103 /* Variant of SDL_SemWait() with a timeout in milliseconds, returns 0 if | |
| 104 the wait succeeds, SDL_MUTEX_TIMEDOUT if the wait does not succeed in | |
| 105 the allotted time, and -1 on error. | |
| 106 On some platforms this function is implemented by looping with a delay | |
| 107 of 1 ms, and so should be avoided if possible. | |
| 108 */ | |
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109 extern DECLSPEC int SDLCALL SDL_SemWaitTimeout(SDL_sem * sem, Uint32 ms); |
| 0 | 110 |
| 111 /* Atomically increases the semaphore's count (not blocking), returns 0, | |
| 112 or -1 on error. | |
| 113 */ | |
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114 extern DECLSPEC int SDLCALL SDL_SemPost(SDL_sem * sem); |
| 0 | 115 |
| 116 /* Returns the current count of the semaphore */ | |
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117 extern DECLSPEC Uint32 SDLCALL SDL_SemValue(SDL_sem * sem); |
| 0 | 118 |
| 119 | |
| 120 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 121 /* Condition variable functions */ | |
| 122 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 123 | |
| 124 /* The SDL condition variable structure, defined in SDL_cond.c */ | |
| 125 struct SDL_cond; | |
| 126 typedef struct SDL_cond SDL_cond; | |
| 127 | |
| 128 /* Create a condition variable */ | |
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129 extern DECLSPEC SDL_cond *SDLCALL SDL_CreateCond(void); |
| 0 | 130 |
| 131 /* Destroy a condition variable */ | |
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132 extern DECLSPEC void SDLCALL SDL_DestroyCond(SDL_cond * cond); |
| 0 | 133 |
| 134 /* Restart one of the threads that are waiting on the condition variable, | |
| 135 returns 0 or -1 on error. | |
| 136 */ | |
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137 extern DECLSPEC int SDLCALL SDL_CondSignal(SDL_cond * cond); |
| 0 | 138 |
| 139 /* Restart all threads that are waiting on the condition variable, | |
| 140 returns 0 or -1 on error. | |
| 141 */ | |
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142 extern DECLSPEC int SDLCALL SDL_CondBroadcast(SDL_cond * cond); |
| 0 | 143 |
| 144 /* Wait on the condition variable, unlocking the provided mutex. | |
| 145 The mutex must be locked before entering this function! | |
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146 The mutex is re-locked once the condition variable is signaled. |
| 0 | 147 Returns 0 when it is signaled, or -1 on error. |
| 148 */ | |
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149 extern DECLSPEC int SDLCALL SDL_CondWait(SDL_cond * cond, SDL_mutex * mut); |
| 0 | 150 |
| 151 /* Waits for at most 'ms' milliseconds, and returns 0 if the condition | |
| 152 variable is signaled, SDL_MUTEX_TIMEDOUT if the condition is not | |
| 153 signaled in the allotted time, and -1 on error. | |
| 154 On some platforms this function is implemented by looping with a delay | |
| 155 of 1 ms, and so should be avoided if possible. | |
| 156 */ | |
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157 extern DECLSPEC int SDLCALL SDL_CondWaitTimeout(SDL_cond * cond, |
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158 SDL_mutex * mutex, Uint32 ms); |
| 0 | 159 |
| 160 /* Ends C function definitions when using C++ */ | |
| 161 #ifdef __cplusplus | |
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162 /* *INDENT-OFF* */ |
| 0 | 163 } |
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164 /* *INDENT-ON* */ |
| 0 | 165 #endif |
| 166 #include "close_code.h" | |
| 167 | |
| 168 #endif /* _SDL_mutex_h */ | |
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169 |
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170 /* vi: set ts=4 sw=4 expandtab: */ |