annotate include/SDL_mutex.h @ 4052:b004c6c24a98 SDL-1.2

Added note about SDL_config.h
author Sam Lantinga <slouken@libsdl.org>
date Thu, 12 Jul 2007 05:30:17 +0000
parents c71e05b4dc2e
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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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
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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.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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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
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifndef _SDL_mutex_h
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24 #define _SDL_mutex_h
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25
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26 /* Functions to provide thread synchronization primitives
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27
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28 These are independent of the other SDL routines.
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29 */
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30
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31 #include "SDL_stdinc.h"
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32 #include "SDL_error.h"
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33
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34 #include "begin_code.h"
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35 /* Set up for C function definitions, even when using C++ */
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36 #ifdef __cplusplus
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37 extern "C" {
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38 #endif
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39
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40 /* Synchronization functions which can time out return this value
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41 if they time out.
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42 */
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43 #define SDL_MUTEX_TIMEDOUT 1
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44
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45 /* This is the timeout value which corresponds to never time out */
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46 #define SDL_MUTEX_MAXWAIT (~(Uint32)0)
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47
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48
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49 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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50 /* Mutex functions */
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51 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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52
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53 /* The SDL mutex structure, defined in SDL_mutex.c */
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54 struct SDL_mutex;
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55 typedef struct SDL_mutex SDL_mutex;
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56
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57 /* Create a mutex, initialized unlocked */
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58 extern DECLSPEC SDL_mutex * SDLCALL SDL_CreateMutex(void);
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59
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60 /* Lock the mutex (Returns 0, or -1 on error) */
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61 #define SDL_LockMutex(m) SDL_mutexP(m)
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62 extern DECLSPEC int SDLCALL SDL_mutexP(SDL_mutex *mutex);
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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 */
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68 #define SDL_UnlockMutex(m) SDL_mutexV(m)
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69 extern DECLSPEC int SDLCALL SDL_mutexV(SDL_mutex *mutex);
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70
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71 /* Destroy a mutex */
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72 extern DECLSPEC void SDLCALL SDL_DestroyMutex(SDL_mutex *mutex);
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73
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74
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75 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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76 /* Semaphore functions */
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77 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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78
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79 /* The SDL semaphore structure, defined in SDL_sem.c */
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80 struct SDL_semaphore;
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81 typedef struct SDL_semaphore SDL_sem;
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82
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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);
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85
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86 /* Destroy a semaphore */
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87 extern DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem *sem);
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88
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89 /* This function suspends the calling thread until the semaphore pointed
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90 * to by sem has a positive count. It then atomically decreases the semaphore
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91 * count.
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92 */
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93 extern DECLSPEC int SDLCALL SDL_SemWait(SDL_sem *sem);
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94
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95 /* Non-blocking variant of SDL_SemWait(), returns 0 if the wait succeeds,
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96 SDL_MUTEX_TIMEDOUT if the wait would block, and -1 on error.
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97 */
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98 extern DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem *sem);
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99
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100 /* Variant of SDL_SemWait() with a timeout in milliseconds, returns 0 if
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101 the wait succeeds, SDL_MUTEX_TIMEDOUT if the wait does not succeed in
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102 the allotted time, and -1 on error.
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103 On some platforms this function is implemented by looping with a delay
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104 of 1 ms, and so should be avoided if possible.
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105 */
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106 extern DECLSPEC int SDLCALL SDL_SemWaitTimeout(SDL_sem *sem, Uint32 ms);
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107
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108 /* Atomically increases the semaphore's count (not blocking), returns 0,
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109 or -1 on error.
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110 */
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111 extern DECLSPEC int SDLCALL SDL_SemPost(SDL_sem *sem);
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112
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113 /* Returns the current count of the semaphore */
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114 extern DECLSPEC Uint32 SDLCALL SDL_SemValue(SDL_sem *sem);
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115
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116
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117 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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118 /* Condition variable functions */
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119 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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120
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121 /* The SDL condition variable structure, defined in SDL_cond.c */
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122 struct SDL_cond;
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123 typedef struct SDL_cond SDL_cond;
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124
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125 /* Create a condition variable */
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126 extern DECLSPEC SDL_cond * SDLCALL SDL_CreateCond(void);
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127
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128 /* Destroy a condition variable */
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129 extern DECLSPEC void SDLCALL SDL_DestroyCond(SDL_cond *cond);
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130
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131 /* Restart one of the threads that are waiting on the condition variable,
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132 returns 0 or -1 on error.
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133 */
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134 extern DECLSPEC int SDLCALL SDL_CondSignal(SDL_cond *cond);
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135
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136 /* Restart all threads that are waiting on the condition variable,
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137 returns 0 or -1 on error.
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138 */
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139 extern DECLSPEC int SDLCALL SDL_CondBroadcast(SDL_cond *cond);
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140
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141 /* Wait on the condition variable, unlocking the provided mutex.
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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.
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144 Returns 0 when it is signaled, or -1 on error.
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145 */
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146 extern DECLSPEC int SDLCALL SDL_CondWait(SDL_cond *cond, SDL_mutex *mut);
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147
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148 /* Waits for at most 'ms' milliseconds, and returns 0 if the condition
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149 variable is signaled, SDL_MUTEX_TIMEDOUT if the condition is not
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150 signaled in the allotted time, and -1 on error.
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151 On some platforms this function is implemented by looping with a delay
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152 of 1 ms, and so should be avoided if possible.
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153 */
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9154ec9ca3d2 Explicitly specify the SDL API calling convention (C by default)
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154 extern DECLSPEC int SDLCALL SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms);
0
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155
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156 /* Ends C function definitions when using C++ */
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157 #ifdef __cplusplus
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158 }
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159 #endif
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160 #include "close_code.h"
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161
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162 #endif /* _SDL_mutex_h */