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annotate include/SDL_thread.h @ 5230:5d01d426f2ea

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It's now possible to disable the fast atomic operations, at a huge performance penalty.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 07 Feb 2011 22:57:33 -0800
parents c2539ff054c8
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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_thread_h
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24 #define _SDL_thread_h
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25
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26 /**
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27 * \file SDL_thread.h
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28 *
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29 * Header for the SDL thread management 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 /* Thread synchronization primitives */
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36 #include "SDL_mutex.h"
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37
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38 #include "begin_code.h"
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39 /* Set up for C function definitions, even when using C++ */
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40 #ifdef __cplusplus
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41 /* *INDENT-OFF* */
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42 extern "C" {
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43 /* *INDENT-ON* */
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44 #endif
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45
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46 /* The SDL thread structure, defined in SDL_thread.c */
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47 struct SDL_Thread;
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48 typedef struct SDL_Thread SDL_Thread;
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49
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50 /* The SDL thread ID */
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51 typedef unsigned long SDL_threadID;
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52
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53 /* The function passed to SDL_CreateThread()
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54 It is passed a void* user context parameter and returns an int.
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55 */
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56 typedef int (SDLCALL * SDL_ThreadFunction) (void *data);
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57
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58 #if defined(__WIN32__) && !defined(HAVE_LIBC)
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59 /**
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60 * \file SDL_thread.h
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61 *
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62 * We compile SDL into a DLL. This means, that it's the DLL which
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63 * creates a new thread for the calling process with the SDL_CreateThread()
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64 * API. There is a problem with this, that only the RTL of the SDL.DLL will
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65 * be initialized for those threads, and not the RTL of the calling
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66 * application!
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67 *
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68 * To solve this, we make a little hack here.
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69 *
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70 * We'll always use the caller's _beginthread() and _endthread() APIs to
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71 * start a new thread. This way, if it's the SDL.DLL which uses this API,
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72 * then the RTL of SDL.DLL will be used to create the new thread, and if it's
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73 * the application, then the RTL of the application will be used.
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74 *
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75 * So, in short:
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76 * Always use the _beginthread() and _endthread() of the calling runtime
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77 * library!
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78 */
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79 #define SDL_PASSED_BEGINTHREAD_ENDTHREAD
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80 #ifndef _WIN32_WCE
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81 #include <process.h> /* This has _beginthread() and _endthread() defined! */
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82 #endif
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83
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84 #ifdef __GNUC__
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85 typedef unsigned long (__cdecl * pfnSDL_CurrentBeginThread) (void *, unsigned,
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86 unsigned
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87 (__stdcall *
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88 func) (void *),
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89 void *arg,
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90 unsigned,
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91 unsigned
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92 *threadID);
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93 typedef void (__cdecl * pfnSDL_CurrentEndThread) (unsigned code);
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94 #else
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95 typedef uintptr_t(__cdecl * pfnSDL_CurrentBeginThread) (void *, unsigned,
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96 unsigned (__stdcall *
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97 func) (void
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98 *),
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99 void *arg, unsigned,
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100 unsigned *threadID);
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101 typedef void (__cdecl * pfnSDL_CurrentEndThread) (unsigned code);
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102 #endif
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103
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104 /**
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105 * Create a thread.
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106 */
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107 extern DECLSPEC SDL_Thread *SDLCALL
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108 SDL_CreateThread(SDL_ThreadFunction fn, void *data,
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109 pfnSDL_CurrentBeginThread pfnBeginThread,
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110 pfnSDL_CurrentEndThread pfnEndThread);
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111
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112 #if defined(_WIN32_WCE)
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113
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114 /**
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115 * Create a thread.
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116 */
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117 #define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, NULL, NULL)
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118
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119 #else
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120
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121 /**
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122 * Create a thread.
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123 */
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124 #define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, _beginthreadex, _endthreadex)
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125
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126 #endif
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127 #else
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128
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129 /**
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130 * Create a thread.
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131 */
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132 extern DECLSPEC SDL_Thread *SDLCALL
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133 SDL_CreateThread(SDL_ThreadFunction fn, void *data);
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134
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135 #endif
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136
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137 /**
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138 * Get the thread identifier for the current thread.
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139 */
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140 extern DECLSPEC SDL_threadID SDLCALL SDL_ThreadID(void);
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141
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142 /**
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143 * Get the thread identifier for the specified thread.
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144 *
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145 * Equivalent to SDL_ThreadID() if the specified thread is NULL.
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146 */
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147 extern DECLSPEC SDL_threadID SDLCALL SDL_GetThreadID(SDL_Thread * thread);
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148
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149 /**
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150 * Wait for a thread to finish.
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151 *
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152 * The return code for the thread function is placed in the area
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153 * pointed to by \c status, if \c status is not NULL.
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154 */
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155 extern DECLSPEC void SDLCALL SDL_WaitThread(SDL_Thread * thread, int *status);
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156
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157
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158 /* Ends C function definitions when using C++ */
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159 #ifdef __cplusplus
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160 /* *INDENT-OFF* */
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161 }
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162 /* *INDENT-ON* */
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163 #endif
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164 #include "close_code.h"
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165
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166 #endif /* _SDL_thread_h */
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167
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168 /* vi: set ts=4 sw=4 expandtab: */