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annotate include/SDL_mutex.h @ 3696:47d923feedb0

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Fixed bug #935 Patrice Mandin Hello, I originally added pth support for threads in SDL 1.2 because on the Atari platform we did not have any thread library. I think pth support could be removed from SDL 1.3 for two reasons: - Atari platform removed - pth does not provides real (preemptive) threads, because it is user space, and expect the application to call one of its function to give CPU to another thread. So it is not exactly useful for applications, that expect threads to run simultaneously.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 24 Jan 2010 20:47:20 +0000
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children f7b03b6838cb
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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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18
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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 /**
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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 */
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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 /* *INDENT-OFF* */
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39 extern "C" {
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40 /* *INDENT-ON* */
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41 #endif
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42
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43 /**
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44 * Synchronization functions which can time out return this value
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45 * if they time out.
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46 */
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47 #define SDL_MUTEX_TIMEDOUT 1
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48
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49 /**
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50 * This is the timeout value which corresponds to never time out.
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51 */
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52 #define SDL_MUTEX_MAXWAIT (~(Uint32)0)
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53
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54
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55 /**
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56 * \name Mutex functions
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57 */
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58 /*@{*/
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59
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60 /* The SDL mutex structure, defined in SDL_mutex.c */
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61 struct SDL_mutex;
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62 typedef struct SDL_mutex SDL_mutex;
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63
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64 /**
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65 * Create a mutex, initialized unlocked.
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66 */
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67 extern DECLSPEC SDL_mutex *SDLCALL SDL_CreateMutex(void);
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68
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69 /**
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70 * Lock the mutex.
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71 *
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72 * \return 0, or -1 on error.
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73 */
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74 #define SDL_LockMutex(m) SDL_mutexP(m)
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75 extern DECLSPEC int SDLCALL SDL_mutexP(SDL_mutex * mutex);
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76
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77 /**
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78 * Unlock the mutex.
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79 *
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80 * \return 0, or -1 on error.
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81 *
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82 * \warning It is an error to unlock a mutex that has not been locked by
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83 * the current thread, and doing so results in undefined behavior.
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84 */
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85 #define SDL_UnlockMutex(m) SDL_mutexV(m)
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86 extern DECLSPEC int SDLCALL SDL_mutexV(SDL_mutex * mutex);
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87
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88 /**
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89 * Destroy a mutex.
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90 */
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91 extern DECLSPEC void SDLCALL SDL_DestroyMutex(SDL_mutex * mutex);
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92
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93 /*@}*//*Mutex functions*/
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94
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95
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96 /**
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97 * \name Semaphore functions
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98 */
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99 /*@{*/
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100
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101 /* The SDL semaphore structure, defined in SDL_sem.c */
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102 struct SDL_semaphore;
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103 typedef struct SDL_semaphore SDL_sem;
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104
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105 /**
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106 * Create a semaphore, initialized with value, returns NULL on failure.
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107 */
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108 extern DECLSPEC SDL_sem *SDLCALL SDL_CreateSemaphore(Uint32 initial_value);
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109
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110 /**
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111 * Destroy a semaphore.
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112 */
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113 extern DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem * sem);
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114
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115 /**
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116 * This function suspends the calling thread until the semaphore pointed
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117 * to by \c sem has a positive count. It then atomically decreases the
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118 * semaphore count.
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119 */
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120 extern DECLSPEC int SDLCALL SDL_SemWait(SDL_sem * sem);
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121
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122 /**
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123 * Non-blocking variant of SDL_SemWait().
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124 *
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125 * \return 0 if the wait succeeds, ::SDL_MUTEX_TIMEDOUT if the wait would
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126 * block, and -1 on error.
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127 */
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128 extern DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem * sem);
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129
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130 /**
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131 * Variant of SDL_SemWait() with a timeout in milliseconds.
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132 *
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133 * \return 0 if the wait succeeds, ::SDL_MUTEX_TIMEDOUT if the wait does not
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134 * succeed in the allotted time, and -1 on error.
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135 *
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136 * \warning On some platforms this function is implemented by looping with a
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137 * delay of 1 ms, and so should be avoided if possible.
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138 */
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139 extern DECLSPEC int SDLCALL SDL_SemWaitTimeout(SDL_sem * sem, Uint32 ms);
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140
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141 /**
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142 * Atomically increases the semaphore's count (not blocking).
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143 *
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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_SemPost(SDL_sem * sem);
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147
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148 /**
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149 * Returns the current count of the semaphore.
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150 */
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151 extern DECLSPEC Uint32 SDLCALL SDL_SemValue(SDL_sem * sem);
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152
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153 /*@}*//*Semaphore functions*/
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154
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155
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156 /**
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157 * \name Condition variable functions
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158 */
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159 /*@{*/
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160
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161 /* The SDL condition variable structure, defined in SDL_cond.c */
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162 struct SDL_cond;
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163 typedef struct SDL_cond SDL_cond;
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164
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165 /**
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166 * Create a condition variable.
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167 */
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168 extern DECLSPEC SDL_cond *SDLCALL SDL_CreateCond(void);
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169
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170 /**
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171 * Destroy a condition variable.
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172 */
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173 extern DECLSPEC void SDLCALL SDL_DestroyCond(SDL_cond * cond);
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174
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175 /**
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176 * Restart one of the threads that are waiting on the condition variable.
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177 *
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178 * \return 0 or -1 on error.
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179 */
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180 extern DECLSPEC int SDLCALL SDL_CondSignal(SDL_cond * cond);
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181
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182 /**
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183 * Restart all threads that are waiting on the condition variable.
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184 * \return 0 or -1 on error.
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185 */
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186 extern DECLSPEC int SDLCALL SDL_CondBroadcast(SDL_cond * cond);
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187
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188 /**
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189 * Wait on the condition variable, unlocking the provided mutex.
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190 *
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191 * \warning The mutex must be locked before entering this function!
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192 *
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193 * The mutex is re-locked once the condition variable is signaled.
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194 *
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195 * \return 0 when it is signaled, or -1 on error.
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196 */
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197 extern DECLSPEC int SDLCALL SDL_CondWait(SDL_cond * cond, SDL_mutex * mut);
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198
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199 /**
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200 * Waits for at most \c ms milliseconds, and returns 0 if the condition
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201 * variable is signaled, ::SDL_MUTEX_TIMEDOUT if the condition is not
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202 * signaled in the allotted time, and -1 on error.
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203 *
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204 * \warning On some platforms this function is implemented by looping with a
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205 * delay of 1 ms, and so should be avoided if possible.
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206 */
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207 extern DECLSPEC int SDLCALL SDL_CondWaitTimeout(SDL_cond * cond,
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208 SDL_mutex * mutex, Uint32 ms);
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209
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210 /*@}*//*Condition variable functions*/
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211
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212
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213 /* Ends C function definitions when using C++ */
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214 #ifdef __cplusplus
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215 /* *INDENT-OFF* */
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216 }
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217 /* *INDENT-ON* */
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218 #endif
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219 #include "close_code.h"
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220
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221 #endif /* _SDL_mutex_h */
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222
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223 /* vi: set ts=4 sw=4 expandtab: */