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annotate include/SDL_mutex.h @ 1652:dc219ba4cf45
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| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Wed, 26 Apr 2006 23:17:39 +0000 |
| parents | c71e05b4dc2e |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| 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 | |
| 26 /* Functions to provide thread synchronization primitives | |
| 27 | |
| 28 These are independent of the other SDL routines. | |
| 29 */ | |
| 30 | |
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31 #include "SDL_stdinc.h" |
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32 #include "SDL_error.h" |
| 0 | 33 |
| 34 #include "begin_code.h" | |
| 35 /* Set up for C function definitions, even when using C++ */ | |
| 36 #ifdef __cplusplus | |
| 37 extern "C" { | |
| 38 #endif | |
| 39 | |
| 40 /* Synchronization functions which can time out return this value | |
| 41 if they time out. | |
| 42 */ | |
| 43 #define SDL_MUTEX_TIMEDOUT 1 | |
| 44 | |
| 45 /* This is the timeout value which corresponds to never time out */ | |
| 46 #define SDL_MUTEX_MAXWAIT (~(Uint32)0) | |
| 47 | |
| 48 | |
| 49 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 50 /* Mutex functions */ | |
| 51 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 52 | |
| 53 /* The SDL mutex structure, defined in SDL_mutex.c */ | |
| 54 struct SDL_mutex; | |
| 55 typedef struct SDL_mutex SDL_mutex; | |
| 56 | |
| 57 /* Create a mutex, initialized unlocked */ | |
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58 extern DECLSPEC SDL_mutex * SDLCALL SDL_CreateMutex(void); |
| 0 | 59 |
| 60 /* Lock the mutex (Returns 0, or -1 on error) */ | |
| 61 #define SDL_LockMutex(m) SDL_mutexP(m) | |
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62 extern DECLSPEC int SDLCALL SDL_mutexP(SDL_mutex *mutex); |
| 0 | 63 |
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64 /* Unlock the mutex (Returns 0, or -1 on error) |
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65 It is an error to unlock a mutex that has not been locked by |
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66 the current thread, and doing so results in undefined behavior. |
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67 */ |
| 0 | 68 #define SDL_UnlockMutex(m) SDL_mutexV(m) |
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69 extern DECLSPEC int SDLCALL SDL_mutexV(SDL_mutex *mutex); |
| 0 | 70 |
| 71 /* Destroy a mutex */ | |
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72 extern DECLSPEC void SDLCALL SDL_DestroyMutex(SDL_mutex *mutex); |
| 0 | 73 |
| 74 | |
| 75 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 76 /* Semaphore functions */ | |
| 77 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 78 | |
| 79 /* The SDL semaphore structure, defined in SDL_sem.c */ | |
| 80 struct SDL_semaphore; | |
| 81 typedef struct SDL_semaphore SDL_sem; | |
| 82 | |
| 83 /* Create a semaphore, initialized with value, returns NULL on failure. */ | |
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84 extern DECLSPEC SDL_sem * SDLCALL SDL_CreateSemaphore(Uint32 initial_value); |
| 0 | 85 |
| 86 /* Destroy a semaphore */ | |
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87 extern DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem *sem); |
| 0 | 88 |
| 89 /* This function suspends the calling thread until the semaphore pointed | |
| 90 * to by sem has a positive count. It then atomically decreases the semaphore | |
| 91 * count. | |
| 92 */ | |
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93 extern DECLSPEC int SDLCALL SDL_SemWait(SDL_sem *sem); |
| 0 | 94 |
| 95 /* Non-blocking variant of SDL_SemWait(), returns 0 if the wait succeeds, | |
| 96 SDL_MUTEX_TIMEDOUT if the wait would block, and -1 on error. | |
| 97 */ | |
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98 extern DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem *sem); |
| 0 | 99 |
| 100 /* Variant of SDL_SemWait() with a timeout in milliseconds, returns 0 if | |
| 101 the wait succeeds, SDL_MUTEX_TIMEDOUT if the wait does not succeed in | |
| 102 the allotted time, and -1 on error. | |
| 103 On some platforms this function is implemented by looping with a delay | |
| 104 of 1 ms, and so should be avoided if possible. | |
| 105 */ | |
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106 extern DECLSPEC int SDLCALL SDL_SemWaitTimeout(SDL_sem *sem, Uint32 ms); |
| 0 | 107 |
| 108 /* Atomically increases the semaphore's count (not blocking), returns 0, | |
| 109 or -1 on error. | |
| 110 */ | |
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111 extern DECLSPEC int SDLCALL SDL_SemPost(SDL_sem *sem); |
| 0 | 112 |
| 113 /* Returns the current count of the semaphore */ | |
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114 extern DECLSPEC Uint32 SDLCALL SDL_SemValue(SDL_sem *sem); |
| 0 | 115 |
| 116 | |
| 117 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 118 /* Condition variable functions */ | |
| 119 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 120 | |
| 121 /* The SDL condition variable structure, defined in SDL_cond.c */ | |
| 122 struct SDL_cond; | |
| 123 typedef struct SDL_cond SDL_cond; | |
| 124 | |
| 125 /* Create a condition variable */ | |
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126 extern DECLSPEC SDL_cond * SDLCALL SDL_CreateCond(void); |
| 0 | 127 |
| 128 /* Destroy a condition variable */ | |
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129 extern DECLSPEC void SDLCALL SDL_DestroyCond(SDL_cond *cond); |
| 0 | 130 |
| 131 /* Restart one of the threads that are waiting on the condition variable, | |
| 132 returns 0 or -1 on error. | |
| 133 */ | |
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134 extern DECLSPEC int SDLCALL SDL_CondSignal(SDL_cond *cond); |
| 0 | 135 |
| 136 /* Restart all 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_CondBroadcast(SDL_cond *cond); |
| 0 | 140 |
| 141 /* Wait on the condition variable, unlocking the provided mutex. | |
| 142 The mutex must be locked before entering this function! | |
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143 The mutex is re-locked once the condition variable is signaled. |
| 0 | 144 Returns 0 when it is signaled, or -1 on error. |
| 145 */ | |
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146 extern DECLSPEC int SDLCALL SDL_CondWait(SDL_cond *cond, SDL_mutex *mut); |
| 0 | 147 |
| 148 /* Waits for at most 'ms' milliseconds, and returns 0 if the condition | |
| 149 variable is signaled, SDL_MUTEX_TIMEDOUT if the condition is not | |
| 150 signaled in the allotted time, and -1 on error. | |
| 151 On some platforms this function is implemented by looping with a delay | |
| 152 of 1 ms, and so should be avoided if possible. | |
| 153 */ | |
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154 extern DECLSPEC int SDLCALL SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms); |
| 0 | 155 |
| 156 /* Ends C function definitions when using C++ */ | |
| 157 #ifdef __cplusplus | |
| 158 } | |
| 159 #endif | |
| 160 #include "close_code.h" | |
| 161 | |
| 162 #endif /* _SDL_mutex_h */ |