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annotate include/SDL_mutex.h @ 2471:910af9032c73 gsoc2008_force_feedback
Creating GSoC 2008 code branches
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 23 Apr 2008 06:26:07 +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: */ |