annotate docs/html/thread.html @ 4427:eada7e321df6 SDL-1.2

Fixed bug #943 Ozkan Sezer 2010-02-06 12:31:06 PST Hi: Here are some small fixes for compiling SDL against mingw-w64. (see http://mingw-w64.sourceforge.net/ . Despite the name, it supports both win32 and win64.) Two patches, one for SDL-1.2 and one for SDL-1.3 attached. src/audio/windx5/directx.h and src/video/windx5/directx.h (both SDL-1.2 and SDL-1.3.) I get compilation errors about some union not having a member named u1 and alike, because of other system headers being included before this one and them already defining DUMMYUNIONNAME and stuff. This header probably assumes that those stuff are defined in windef.h, but mingw-w64 headers define them in _mingw.h. Easily fixed by moving NONAMELESSUNION definition to the top of the file. SDL_dx5yuv.c (SDL-1.2-only) also needs to include the header before SDL_video.h to avoid the same problem. src/thread/win32/SDL_systhread.c (both SDL-1.2 and SDL-1.3.) : The __GNUC__ case for pfnSDL_CurrentBeginThread is 32-bit centric because _beginthreadex returns uintptr_t, not unsigned long which is 32 bits in win64. Changing the return type to uintptr_t fixes it. Hope these are useful. Thanks.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 10 Mar 2010 15:04:13 +0000
parents f12379c41042
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4 >Multi-threaded Programming</TITLE
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44 >SDL Library Documentation</TH
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77 ><H1
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78 ><A
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79 NAME="THREAD"
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80 ></A
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81 >Chapter 12. Multi-threaded Programming</H1
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87 >Table of Contents</B
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91 HREF="sdlcreatethread.html"
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92 >SDL_CreateThread</A
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93 >&nbsp;--&nbsp;Creates a new thread of execution that shares its parent's properties.</DT
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94 ><DT
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97 >SDL_ThreadID</A
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98 >&nbsp;--&nbsp;Get the 32-bit thread identifier for the current thread.</DT
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99 ><DT
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101 HREF="sdlgetthreadid.html"
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102 >SDL_GetThreadID</A
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103 >&nbsp;--&nbsp;Get the SDL thread ID of a SDL_Thread</DT
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104 ><DT
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107 >SDL_WaitThread</A
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108 >&nbsp;--&nbsp;Wait for a thread to finish.</DT
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112 >SDL_KillThread</A
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113 >&nbsp;--&nbsp;Gracelessly terminates the thread.</DT
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117 >SDL_CreateMutex</A
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118 >&nbsp;--&nbsp;Create a mutex</DT
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122 >SDL_DestroyMutex</A
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123 >&nbsp;--&nbsp;Destroy a mutex</DT
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127 >SDL_mutexP</A
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128 >&nbsp;--&nbsp;Lock a mutex</DT
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132 >SDL_mutexV</A
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133 >&nbsp;--&nbsp;Unlock a mutex</DT
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134 ><DT
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135 ><A
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136 HREF="sdlcreatesemaphore.html"
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137 >SDL_CreateSemaphore</A
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138 >&nbsp;--&nbsp;Creates a new semaphore and assigns an initial value to it.</DT
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139 ><DT
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140 ><A
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141 HREF="sdldestroysemaphore.html"
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142 >SDL_DestroySemaphore</A
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143 >&nbsp;--&nbsp;Destroys a semaphore that was created by <A
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144 HREF="sdlcreatesemaphore.html"
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145 >SDL_CreateSemaphore</A
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146 >.</DT
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147 ><DT
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148 ><A
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149 HREF="sdlsemwait.html"
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150 >SDL_SemWait</A
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151 >&nbsp;--&nbsp;Lock a semaphore and suspend the thread if the semaphore value is zero.</DT
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152 ><DT
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153 ><A
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154 HREF="sdlsemtrywait.html"
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155 >SDL_SemTryWait</A
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156 >&nbsp;--&nbsp;Attempt to lock a semaphore but don't suspend the thread.</DT
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157 ><DT
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158 ><A
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159 HREF="sdlsemwaittimeout.html"
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160 >SDL_SemWaitTimeout</A
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161 >&nbsp;--&nbsp;Lock a semaphore, but only wait up to a specified maximum time.</DT
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162 ><DT
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163 ><A
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164 HREF="sdlsempost.html"
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165 >SDL_SemPost</A
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166 >&nbsp;--&nbsp;Unlock a semaphore.</DT
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167 ><DT
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168 ><A
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169 HREF="sdlsemvalue.html"
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170 >SDL_SemValue</A
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171 >&nbsp;--&nbsp;Return the current value of a semaphore.</DT
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172 ><DT
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173 ><A
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174 HREF="sdlcreatecond.html"
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175 >SDL_CreateCond</A
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176 >&nbsp;--&nbsp;Create a condition variable</DT
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177 ><DT
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178 ><A
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179 HREF="sdldestroycond.html"
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180 >SDL_DestroyCond</A
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181 >&nbsp;--&nbsp;Destroy a condition variable</DT
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182 ><DT
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183 ><A
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184 HREF="sdlcondsignal.html"
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185 >SDL_CondSignal</A
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186 >&nbsp;--&nbsp;Restart a thread wait on a condition variable</DT
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187 ><DT
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188 ><A
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189 HREF="sdlcondbroadcast.html"
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190 >SDL_CondBroadcast</A
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191 >&nbsp;--&nbsp;Restart all threads waiting on a condition variable</DT
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192 ><DT
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193 ><A
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194 HREF="sdlcondwait.html"
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195 >SDL_CondWait</A
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196 >&nbsp;--&nbsp;Wait on a condition variable</DT
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197 ><DT
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198 ><A
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199 HREF="sdlcondwaittimeout.html"
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200 >SDL_CondWaitTimeout</A
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201 >&nbsp;--&nbsp;Wait on a condition variable, with timeout</DT
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202 ></DL
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203 ></DIV
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204 ><P
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205 >SDL provides functions for creating threads, mutexes, semphores and condition variables.</P
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206 ><P
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207 >In general, you must be very aware of concurrency and data integrity issues
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208 when writing multi-threaded programs. Some good guidelines include:
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209 <P
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210 ></P
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211 ><UL
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212 ><LI
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213 ><P
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214 >Don't call SDL video/event functions from separate threads</P
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215 ></LI
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216 ><LI
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217 ><P
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218 >Don't use any library functions in separate threads</P
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219 ></LI
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220 ><LI
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221 ><P
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222 >Don't perform any memory management in separate threads</P
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223 ></LI
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224 ><LI
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225 ><P
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226 >Lock global variables which may be accessed by multiple threads</P
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227 ></LI
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228 ><LI
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229 ><P
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230 >Never terminate threads, always set a flag and wait for them to quit</P
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231 ></LI
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232 ><LI
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233 ><P
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234 >Think very carefully about all possible ways your code may interact</P
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235 ></LI
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236 ></UL
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237 ></P
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238 ><DIV
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239 CLASS="NOTE"
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240 ><BLOCKQUOTE
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241 CLASS="NOTE"
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242 ><P
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243 ><B
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244 >Note: </B
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245 >SDL's threading is not implemented on MacOS, due to that lack of preemptive thread support (Mac OS X dos nt suffer from this problem)</P
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246 ></BLOCKQUOTE
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247 ></DIV
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248 ></DIV
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249 ><DIV
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250 CLASS="NAVFOOTER"
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251 ><HR
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252 ALIGN="LEFT"
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253 WIDTH="100%"><TABLE
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254 SUMMARY="Footer navigation table"
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255 WIDTH="100%"
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256 BORDER="0"
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257 CELLPADDING="0"
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258 CELLSPACING="0"
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259 ><TR
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260 ><TD
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261 WIDTH="33%"
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262 ALIGN="left"
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263 VALIGN="top"
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264 ><A
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265 HREF="sdlcdtrack.html"
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266 ACCESSKEY="P"
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267 >Prev</A
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268 ></TD
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269 ><TD
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270 WIDTH="34%"
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271 ALIGN="center"
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272 VALIGN="top"
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273 ><A
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274 HREF="index.html"
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275 ACCESSKEY="H"
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276 >Home</A
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277 ></TD
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278 ><TD
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279 WIDTH="33%"
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280 ALIGN="right"
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281 VALIGN="top"
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282 ><A
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283 HREF="sdlcreatethread.html"
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284 ACCESSKEY="N"
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285 >Next</A
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286 ></TD
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287 ></TR
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288 ><TR
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289 ><TD
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290 WIDTH="33%"
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291 ALIGN="left"
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292 VALIGN="top"
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293 >SDL_CDtrack</TD
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294 ><TD
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295 WIDTH="34%"
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296 ALIGN="center"
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297 VALIGN="top"
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298 ><A
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299 HREF="reference.html"
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300 ACCESSKEY="U"
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301 >Up</A
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302 ></TD
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303 ><TD
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304 WIDTH="33%"
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305 ALIGN="right"
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306 VALIGN="top"
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307 >SDL_CreateThread</TD
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308 ></TR
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309 ></TABLE
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310 ></DIV
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311 ></BODY
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312 ></HTML
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313 >