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| Rev | Author | Line No. | Line |
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| 5131 | clevermous | 1 | |
| 2 | > |
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| 3 | > |
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| 4 | >Multi-threaded Programming |
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| 5 | > |
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| 6 | NAME="GENERATOR" |
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| 7 | CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
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| 8 | "> |
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| 9 | REL="HOME" |
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| 10 | TITLE="SDL Library Documentation" |
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| 11 | HREF="index.html"> |
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| 12 | REL="UP" |
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| 13 | TITLE="SDL Reference" |
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| 14 | HREF="reference.html"> |
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| 15 | REL="PREVIOUS" |
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| 16 | TITLE="SDL_CDtrack" |
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| 17 | HREF="sdlcdtrack.html"> |
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| 18 | REL="NEXT" |
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| 19 | TITLE="SDL_CreateThread" |
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| 20 | HREF="sdlcreatethread.html"> |
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| 21 | NAME="KEYWORD" |
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| 22 | CONTENT="threads"> |
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| 23 | NAME="KEYWORD" |
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| 24 | CONTENT="function"> |
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| 25 | > |
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| 26 | CLASS="CHAPTER" |
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| 27 | BGCOLOR="#FFF8DC" |
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| 28 | TEXT="#000000" |
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| 29 | LINK="#0000ee" |
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| 30 | VLINK="#551a8b" |
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| 31 | ALINK="#ff0000" |
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| 32 | > |
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| 33 | CLASS="NAVHEADER" |
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| 34 | > |
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| 35 | WIDTH="100%" |
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| 36 | BORDER="0" |
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| 37 | CELLPADDING="0" |
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| 38 | CELLSPACING="0" |
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| 39 | > |
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| 40 | > |
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| 41 | COLSPAN="3" |
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| 42 | ALIGN="center" |
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| 43 | >SDL Library Documentation |
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| 44 | > |
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| 45 | > |
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| 46 | > |
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| 47 | WIDTH="10%" |
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| 48 | ALIGN="left" |
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| 49 | VALIGN="bottom" |
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| 50 | > |
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| 51 | HREF="sdlcdtrack.html" |
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| 52 | >Prev |
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| 53 | > |
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| 54 | > |
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| 55 | WIDTH="80%" |
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| 56 | ALIGN="center" |
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| 57 | VALIGN="bottom" |
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| 58 | > |
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| 59 | > |
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| 60 | WIDTH="10%" |
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| 61 | ALIGN="right" |
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| 62 | VALIGN="bottom" |
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| 63 | > |
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| 64 | HREF="sdlcreatethread.html" |
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| 65 | >Next |
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| 66 | > |
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| 67 | > |
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| 68 | > |
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| 69 | > |
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| 70 | ALIGN="LEFT" |
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| 71 | WIDTH="100%"> |
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| 72 | > |
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| 73 | CLASS="CHAPTER" |
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| 74 | > |
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| 75 | > |
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| 76 | NAME="THREAD" |
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| 77 | >Chapter 12. Multi-threaded Programming |
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| 78 | > |
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| 79 | > |
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| 80 | CLASS="TOC" |
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| 81 | > |
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| 82 | > |
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| 83 | > |
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| 84 | >Table of Contents |
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| 85 | > |
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| 86 | > |
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| 87 | > |
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| 88 | HREF="sdlcreatethread.html" |
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| 89 | >SDL_CreateThread |
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| 90 | > — Creates a new thread of execution that shares its parent's properties. |
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| 91 | > |
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| 92 | > |
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| 93 | HREF="sdlthreadid.html" |
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| 94 | >SDL_ThreadID |
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| 95 | > — Get the 32-bit thread identifier for the current thread. |
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| 96 | > |
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| 97 | > |
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| 98 | HREF="sdlgetthreadid.html" |
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| 99 | >SDL_GetThreadID |
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| 100 | > — Get the SDL thread ID of a SDL_Thread |
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| 101 | > |
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| 102 | > |
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| 103 | HREF="sdlwaitthread.html" |
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| 104 | >SDL_WaitThread |
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| 105 | > — Wait for a thread to finish. |
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| 106 | > |
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| 107 | > |
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| 108 | HREF="sdlkillthread.html" |
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| 109 | >SDL_KillThread |
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| 110 | > — Gracelessly terminates the thread. |
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| 111 | > |
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| 112 | > |
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| 113 | HREF="sdlcreatemutex.html" |
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| 114 | >SDL_CreateMutex |
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| 115 | > — Create a mutex |
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| 116 | > |
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| 117 | > |
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| 118 | HREF="sdldestroymutex.html" |
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| 119 | >SDL_DestroyMutex |
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| 120 | > — Destroy a mutex |
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| 121 | > |
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| 122 | > |
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| 123 | HREF="sdlmutexp.html" |
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| 124 | >SDL_mutexP |
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| 125 | > — Lock a mutex |
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| 126 | > |
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| 127 | > |
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| 128 | HREF="sdlmutexv.html" |
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| 129 | >SDL_mutexV |
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| 130 | > — Unlock a mutex |
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| 131 | > |
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| 132 | > |
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| 133 | HREF="sdlcreatesemaphore.html" |
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| 134 | >SDL_CreateSemaphore |
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| 135 | > — Creates a new semaphore and assigns an initial value to it. |
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| 136 | > |
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| 137 | > |
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| 138 | HREF="sdldestroysemaphore.html" |
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| 139 | >SDL_DestroySemaphore |
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| 140 | > — Destroys a semaphore that was created by |
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| 141 | HREF="sdlcreatesemaphore.html" |
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| 142 | >SDL_CreateSemaphore |
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| 143 | >. |
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| 144 | > |
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| 145 | > |
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| 146 | HREF="sdlsemwait.html" |
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| 147 | >SDL_SemWait |
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| 148 | > — Lock a semaphore and suspend the thread if the semaphore value is zero. |
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| 149 | > |
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| 150 | > |
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| 151 | HREF="sdlsemtrywait.html" |
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| 152 | >SDL_SemTryWait |
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| 153 | > — Attempt to lock a semaphore but don't suspend the thread. |
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| 154 | > |
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| 155 | > |
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| 156 | HREF="sdlsemwaittimeout.html" |
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| 157 | >SDL_SemWaitTimeout |
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| 158 | > — Lock a semaphore, but only wait up to a specified maximum time. |
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| 159 | > |
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| 160 | > |
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| 161 | HREF="sdlsempost.html" |
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| 162 | >SDL_SemPost |
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| 163 | > — Unlock a semaphore. |
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| 164 | > |
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| 165 | > |
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| 166 | HREF="sdlsemvalue.html" |
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| 167 | >SDL_SemValue |
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| 168 | > — Return the current value of a semaphore. |
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| 169 | > |
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| 170 | > |
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| 171 | HREF="sdlcreatecond.html" |
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| 172 | >SDL_CreateCond |
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| 173 | > — Create a condition variable |
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| 174 | > |
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| 175 | > |
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| 176 | HREF="sdldestroycond.html" |
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| 177 | >SDL_DestroyCond |
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| 178 | > — Destroy a condition variable |
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| 179 | > |
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| 180 | > |
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| 181 | HREF="sdlcondsignal.html" |
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| 182 | >SDL_CondSignal |
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| 183 | > — Restart a thread wait on a condition variable |
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| 184 | > |
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| 185 | > |
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| 186 | HREF="sdlcondbroadcast.html" |
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| 187 | >SDL_CondBroadcast |
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| 188 | > — Restart all threads waiting on a condition variable |
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| 189 | > |
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| 190 | > |
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| 191 | HREF="sdlcondwait.html" |
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| 192 | >SDL_CondWait |
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| 193 | > — Wait on a condition variable |
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| 194 | > |
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| 195 | > |
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| 196 | HREF="sdlcondwaittimeout.html" |
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| 197 | >SDL_CondWaitTimeout |
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| 198 | > — Wait on a condition variable, with timeout |
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| 199 | > |
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| 200 | > |
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| 201 | > |
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| 202 | >SDL provides functions for creating threads, mutexes, semphores and condition variables. |
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| 203 | > |
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| 204 | >In general, you must be very aware of concurrency and data integrity issues |
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| 205 | when writing multi-threaded programs. Some good guidelines include: |
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| 206 | |||
| 207 | > |
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| 208 | > |
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| 209 | > |
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| 210 | > |
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| 211 | >Don't call SDL video/event functions from separate threads |
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| 212 | > |
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| 213 | > |
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| 214 | > |
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| 215 | >Don't use any library functions in separate threads |
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| 216 | > |
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| 217 | > |
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| 218 | > |
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| 219 | >Don't perform any memory management in separate threads |
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| 220 | > |
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| 221 | > |
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| 222 | > |
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| 223 | >Lock global variables which may be accessed by multiple threads |
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| 224 | > |
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| 225 | > |
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| 226 | > |
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| 227 | >Never terminate threads, always set a flag and wait for them to quit |
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| 228 | > |
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| 229 | > |
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| 230 | > |
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| 231 | >Think very carefully about all possible ways your code may interact |
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| 232 | > |
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| 233 | > |
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| 234 | > |
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| 235 | > |
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| 236 | CLASS="NOTE" |
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| 237 | > |
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| 238 | CLASS="NOTE" |
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| 239 | > |
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| 240 | > |
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| 241 | >Note: |
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| 242 | >SDL's threading is not implemented on MacOS, due to that lack of preemptive thread support (eck!) |
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| 243 | > |
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| 244 | > |
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| 245 | > |
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| 246 | > |
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| 247 | CLASS="NAVFOOTER" |
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| 248 | > |
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| 249 | ALIGN="LEFT" |
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| 250 | WIDTH="100%"> |
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| 251 | WIDTH="100%" |
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| 252 | BORDER="0" |
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| 253 | CELLPADDING="0" |
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| 254 | CELLSPACING="0" |
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| 255 | > |
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| 256 | > |
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| 257 | WIDTH="33%" |
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| 258 | ALIGN="left" |
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| 259 | VALIGN="top" |
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| 260 | > |
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| 261 | HREF="sdlcdtrack.html" |
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| 262 | >Prev |
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| 263 | > |
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| 264 | > |
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| 265 | WIDTH="34%" |
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| 266 | ALIGN="center" |
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| 267 | VALIGN="top" |
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| 268 | > |
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| 269 | HREF="index.html" |
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| 270 | >Home |
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| 271 | > |
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| 272 | > |
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| 273 | WIDTH="33%" |
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| 274 | ALIGN="right" |
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| 275 | VALIGN="top" |
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| 276 | > |
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| 277 | HREF="sdlcreatethread.html" |
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| 278 | >Next |
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| 279 | > |
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| 280 | > |
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| 281 | > |
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| 282 | > |
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| 283 | WIDTH="33%" |
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| 284 | ALIGN="left" |
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| 285 | VALIGN="top" |
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| 286 | >SDL_CDtrack |
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| 287 | > |
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| 288 | WIDTH="34%" |
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| 289 | ALIGN="center" |
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| 290 | VALIGN="top" |
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| 291 | > |
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| 292 | HREF="reference.html" |
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| 293 | >Up |
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| 294 | > |
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| 295 | > |
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| 296 | WIDTH="33%" |
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| 297 | ALIGN="right" |
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| 298 | VALIGN="top" |
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| 299 | >SDL_CreateThread |
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| 300 | > |
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| 301 | > |
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| 302 | > |
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| 303 | > |
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| 304 | > |
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| 305 | > |