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annotate include/SDL_thread.h @ 2779:4436464c4f51

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Fixed Bugzilla bug #205 Removed SDL_KillThread() from the API, as it isn't safe on many platforms.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 24 Nov 2008 00:18:42 +0000
parents 866052b01ee5
children 99210400e8b9
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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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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 /* Create a thread */
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51 #if (defined(__WIN32__) && !defined(HAVE_LIBC)) || defined(__OS2__)
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52 /*
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53 We compile SDL into a DLL on OS/2. This means, that it's the DLL which
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54 creates a new thread for the calling process with the SDL_CreateThread()
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55 API. There is a problem with this, that only the RTL of the SDL.DLL will
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56 be initialized for those threads, and not the RTL of the calling application!
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57 To solve this, we make a little hack here.
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58 We'll always use the caller's _beginthread() and _endthread() APIs to
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59 start a new thread. This way, if it's the SDL.DLL which uses this API,
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60 then the RTL of SDL.DLL will be used to create the new thread, and if it's
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61 the application, then the RTL of the application will be used.
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62 So, in short:
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63 Always use the _beginthread() and _endthread() of the calling runtime library!
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64 */
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65 #define SDL_PASSED_BEGINTHREAD_ENDTHREAD
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66 #ifndef _WIN32_WCE
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67 #include <process.h> /* This has _beginthread() and _endthread() defined! */
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68 #endif
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69
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70 #ifdef __OS2__
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71 typedef int (*pfnSDL_CurrentBeginThread) (void (*func) (void *), void *,
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72 unsigned, void *arg);
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73 typedef void (*pfnSDL_CurrentEndThread) (void);
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74 #elif __GNUC__
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75 typedef unsigned long (__cdecl * pfnSDL_CurrentBeginThread) (void *, unsigned,
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76 unsigned
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77 (__stdcall *
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78 func) (void *),
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79 void *arg,
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80 unsigned,
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81 unsigned
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82 *threadID);
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83 typedef void (__cdecl * pfnSDL_CurrentEndThread) (unsigned code);
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84 #else
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85 typedef uintptr_t(__cdecl * pfnSDL_CurrentBeginThread) (void *, unsigned,
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86 unsigned (__stdcall *
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87 func) (void
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88 *),
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89 void *arg, unsigned,
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90 unsigned *threadID);
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91 typedef void (__cdecl * pfnSDL_CurrentEndThread) (unsigned code);
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92 #endif
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93
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94 extern DECLSPEC SDL_Thread *SDLCALL
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95 SDL_CreateThread(int (SDLCALL * f) (void *), void *data,
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96 pfnSDL_CurrentBeginThread pfnBeginThread,
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97 pfnSDL_CurrentEndThread pfnEndThread);
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98
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99 #ifdef __OS2__
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100 #define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, _beginthread, _endthread)
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101 #elif defined(_WIN32_WCE)
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102 #define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, NULL, NULL)
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103 #else
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104 #define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, _beginthreadex, _endthreadex)
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105 #endif
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106 #else
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107 extern DECLSPEC SDL_Thread *SDLCALL
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108 SDL_CreateThread(int (SDLCALL * fn) (void *), void *data);
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109 #endif
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110
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111 /* Get the 32-bit thread identifier for the current thread */
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112 extern DECLSPEC Uint32 SDLCALL SDL_ThreadID(void);
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113
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114 /* Get the 32-bit thread identifier for the specified thread,
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115 equivalent to SDL_ThreadID() if the specified thread is NULL.
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116 */
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117 extern DECLSPEC Uint32 SDLCALL SDL_GetThreadID(SDL_Thread * thread);
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118
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119 /* Wait for a thread to finish.
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120 The return code for the thread function is placed in the area
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121 pointed to by 'status', if 'status' is not NULL.
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122 */
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123 extern DECLSPEC void SDLCALL SDL_WaitThread(SDL_Thread * thread, int *status);
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124
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125 /* This function is here for binary compatibility with legacy apps, but
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126 in SDL 1.3 and later, it's a no-op. You cannot forcibly kill a thread
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127 in a safe manner on many platforms. You should instead find a way to
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128 alert your thread that it is time to terminate, and then have it gracefully
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129 exit on its own. Do not ever call this function!
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130 */
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131 extern DECLSPEC void SDLCALL SDL_KillThread(SDL_Thread * thread);
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132
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133
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134 /* Ends C function definitions when using C++ */
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135 #ifdef __cplusplus
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136 /* *INDENT-OFF* */
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137 }
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138 /* *INDENT-ON* */
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139 #endif
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140 #include "close_code.h"
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141
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142 #endif /* _SDL_thread_h */
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143
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144 /* vi: set ts=4 sw=4 expandtab: */