annotate include/SDL_mutex.h @ 5173:2fdf3e37f4d1 SDL-1.2

Fixed compile error
author Sam Lantinga <slouken@libsdl.org>
date Fri, 04 Feb 2011 09:07:39 -0800
parents 4c4113c2162c
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 /** @file SDL_mutex.h
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27 * Functions to provide thread synchronization primitives
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28 *
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29 * @note These are independent of the other SDL routines.
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30 */
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31
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32 #include "SDL_stdinc.h"
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33 #include "SDL_error.h"
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34
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35 #include "begin_code.h"
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36 /* Set up for C function definitions, even when using C++ */
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37 #ifdef __cplusplus
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38 extern "C" {
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39 #endif
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40
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41 /** Synchronization functions which can time out return this value
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42 * if they time out.
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43 */
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44 #define SDL_MUTEX_TIMEDOUT 1
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45
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46 /** This is the timeout value which corresponds to never time out */
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47 #define SDL_MUTEX_MAXWAIT (~(Uint32)0)
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48
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49
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50 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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51 /** @name Mutex functions */ /*@{*/
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52 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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53
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54 /** The SDL mutex structure, defined in SDL_mutex.c */
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55 struct SDL_mutex;
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56 typedef struct SDL_mutex SDL_mutex;
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57
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58 /** Create a mutex, initialized unlocked */
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59 extern DECLSPEC SDL_mutex * SDLCALL SDL_CreateMutex(void);
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60
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61 #define SDL_LockMutex(m) SDL_mutexP(m)
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62 /** Lock the mutex
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63 * @return 0, or -1 on error
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64 */
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65 extern DECLSPEC int SDLCALL SDL_mutexP(SDL_mutex *mutex);
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66
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67 #define SDL_UnlockMutex(m) SDL_mutexV(m)
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68 /** Unlock the mutex
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69 * @return 0, or -1 on error
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70 *
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71 * It is an error to unlock a mutex that has not been locked by
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72 * the current thread, and doing so results in undefined behavior.
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73 */
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74 extern DECLSPEC int SDLCALL SDL_mutexV(SDL_mutex *mutex);
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75
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76 /** Destroy a mutex */
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77 extern DECLSPEC void SDLCALL SDL_DestroyMutex(SDL_mutex *mutex);
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78
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79 /*@}*/
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80
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81 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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82 /** @name Semaphore functions */ /*@{*/
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83 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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84
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85 /** The SDL semaphore structure, defined in SDL_sem.c */
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86 struct SDL_semaphore;
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87 typedef struct SDL_semaphore SDL_sem;
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88
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89 /** Create a semaphore, initialized with value, returns NULL on failure. */
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90 extern DECLSPEC SDL_sem * SDLCALL SDL_CreateSemaphore(Uint32 initial_value);
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91
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92 /** Destroy a semaphore */
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93 extern DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem *sem);
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94
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95 /**
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96 * This function suspends the calling thread until the semaphore pointed
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97 * to by sem has a positive count. It then atomically decreases the semaphore
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98 * count.
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99 */
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100 extern DECLSPEC int SDLCALL SDL_SemWait(SDL_sem *sem);
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101
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102 /** Non-blocking variant of SDL_SemWait().
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103 * @return 0 if the wait succeeds,
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104 * SDL_MUTEX_TIMEDOUT if the wait would block, and -1 on error.
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105 */
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106 extern DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem *sem);
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107
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108 /** Variant of SDL_SemWait() with a timeout in milliseconds, returns 0 if
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109 * the wait succeeds, SDL_MUTEX_TIMEDOUT if the wait does not succeed in
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110 * the allotted time, and -1 on error.
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111 *
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112 * On some platforms this function is implemented by looping with a delay
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113 * of 1 ms, and so should be avoided if possible.
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114 */
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115 extern DECLSPEC int SDLCALL SDL_SemWaitTimeout(SDL_sem *sem, Uint32 ms);
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116
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117 /** Atomically increases the semaphore's count (not blocking).
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118 * @return 0, or -1 on error.
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119 */
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120 extern DECLSPEC int SDLCALL SDL_SemPost(SDL_sem *sem);
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121
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122 /** Returns the current count of the semaphore */
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123 extern DECLSPEC Uint32 SDLCALL SDL_SemValue(SDL_sem *sem);
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124
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125 /*@}*/
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126
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127 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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128 /** @name Condition_variable_functions */ /*@{*/
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129 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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130
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131 /*@{*/
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132 /** The SDL condition variable structure, defined in SDL_cond.c */
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133 struct SDL_cond;
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134 typedef struct SDL_cond SDL_cond;
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135 /*@}*/
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136
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137 /** Create a condition variable */
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138 extern DECLSPEC SDL_cond * SDLCALL SDL_CreateCond(void);
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139
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140 /** Destroy a condition variable */
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141 extern DECLSPEC void SDLCALL SDL_DestroyCond(SDL_cond *cond);
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142
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143 /** Restart one of the threads that are waiting on the condition variable,
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144 * @return 0 or -1 on error.
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145 */
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146 extern DECLSPEC int SDLCALL SDL_CondSignal(SDL_cond *cond);
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147
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148 /** Restart all threads that are waiting on the condition variable,
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149 * @return 0 or -1 on error.
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150 */
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151 extern DECLSPEC int SDLCALL SDL_CondBroadcast(SDL_cond *cond);
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152
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153 /** Wait on the condition variable, unlocking the provided mutex.
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154 * The mutex must be locked before entering this function!
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155 * The mutex is re-locked once the condition variable is signaled.
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156 * @return 0 when it is signaled, or -1 on error.
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157 */
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158 extern DECLSPEC int SDLCALL SDL_CondWait(SDL_cond *cond, SDL_mutex *mut);
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159
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160 /** Waits for at most 'ms' milliseconds, and returns 0 if the condition
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161 * variable is signaled, SDL_MUTEX_TIMEDOUT if the condition is not
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162 * signaled in the allotted time, and -1 on error.
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163 * On some platforms this function is implemented by looping with a delay
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164 * of 1 ms, and so should be avoided if possible.
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165 */
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166 extern DECLSPEC int SDLCALL SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms);
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167
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168 /*@}*/
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169
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170 /* Ends C function definitions when using C++ */
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171 #ifdef __cplusplus
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172 }
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173 #endif
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174 #include "close_code.h"
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175
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176 #endif /* _SDL_mutex_h */
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177