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<HTML><HEAD><TITLE>Multi-threaded Programming</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="SDL Library Documentation"HREF="index.html"><LINKREL="UP"TITLE="SDL Reference"HREF="reference.html"><LINKREL="PREVIOUS"TITLE="SDL_CDtrack"HREF="sdlcdtrack.html"><LINKREL="NEXT"TITLE="SDL_CreateThread"HREF="sdlcreatethread.html"><METANAME="KEYWORD"CONTENT="threads"><METANAME="KEYWORD"CONTENT="function"></HEAD><BODYCLASS="CHAPTER"BGCOLOR="#FFF8DC"TEXT="#000000"LINK="#0000ee"VLINK="#551a8b"ALINK="#ff0000"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">SDL Library Documentation</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="sdlcdtrack.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sdlcreatethread.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="CHAPTER"><H1><ANAME="THREAD"></A>Chapter 12. Multi-threaded Programming</H1><DIVCLASS="TOC"><DL><DT><B>Table of Contents</B></DT><DT><AHREF="sdlcreatethread.html">SDL_CreateThread</A> -- Creates a new thread of execution that shares its parent's properties.</DT><DT><AHREF="sdlthreadid.html">SDL_ThreadID</A> -- Get the 32-bit thread identifier for the current thread.</DT><DT><AHREF="sdlgetthreadid.html">SDL_GetThreadID</A> -- Get the SDL thread ID of a SDL_Thread</DT><DT><AHREF="sdlwaitthread.html">SDL_WaitThread</A> -- Wait for a thread to finish.</DT><DT><AHREF="sdlkillthread.html">SDL_KillThread</A> -- Gracelessly terminates the thread.</DT><DT><AHREF="sdlcreatemutex.html">SDL_CreateMutex</A> -- Create a mutex</DT><DT><AHREF="sdldestroymutex.html">SDL_DestroyMutex</A> -- Destroy a mutex</DT><DT><AHREF="sdlmutexp.html">SDL_mutexP</A> -- Lock a mutex</DT><DT><AHREF="sdlmutexv.html">SDL_mutexV</A> -- Unlock a mutex</DT><DT><AHREF="sdlcreatesemaphore.html">SDL_CreateSemaphore</A> -- Creates a new semaphore and assigns an initial value to it.</DT><DT><AHREF="sdldestroysemaphore.html">SDL_DestroySemaphore</A> -- Destroys a semaphore that was created by <AHREF="sdlcreatesemaphore.html">SDL_CreateSemaphore</A>.</DT><DT><AHREF="sdlsemwait.html">SDL_SemWait</A> -- Lock a semaphore and suspend the thread if the semaphore value is zero.</DT><DT><AHREF="sdlsemtrywait.html">SDL_SemTryWait</A> -- Attempt to lock a semaphore but don't suspend the thread.</DT><DT><AHREF="sdlsemwaittimeout.html">SDL_SemWaitTimeout</A> -- Lock a semaphore, but only wait up to a specified maximum time.</DT><DT><AHREF="sdlsempost.html">SDL_SemPost</A> -- Unlock a semaphore.</DT><DT><AHREF="sdlsemvalue.html">SDL_SemValue</A> -- Return the current value of a semaphore.</DT><DT><AHREF="sdlcreatecond.html">SDL_CreateCond</A> -- Create a condition variable</DT><DT><AHREF="sdldestroycond.html">SDL_DestroyCond</A> -- Destroy a condition variable</DT><DT><AHREF="sdlcondsignal.html">SDL_CondSignal</A> -- Restart a thread wait on a condition variable</DT><DT><AHREF="sdlcondbroadcast.html">SDL_CondBroadcast</A> -- Restart all threads waiting on a condition variable</DT><DT><AHREF="sdlcondwait.html">SDL_CondWait</A> -- Wait on a condition variable</DT><DT><AHREF="sdlcondwaittimeout.html">SDL_CondWaitTimeout</A> -- Wait on a condition variable, with timeout</DT></DL></DIV><P>SDL provides functions for creating threads, mutexes, semphores and condition variables.</P><P>In general, you must be very aware of concurrency and data integrity issueswhen writing multi-threaded programs. Some good guidelines include:<P></P><UL><LI><P>Don't call SDL video/event functions from separate threads</P></LI><LI><P>Don't use any library functions in separate threads</P></LI><LI><P>Don't perform any memory management in separate threads</P></LI><LI><P>Lock global variables which may be accessed by multiple threads</P></LI><LI><P>Never terminate threads, always set a flag and wait for them to quit</P></LI><LI><P>Think very carefully about all possible ways your code may interact</P></LI></UL></P><DIVCLASS="NOTE"><BLOCKQUOTECLASS="NOTE"><P><B>Note: </B>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></BLOCKQUOTE></DIV></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="sdlcdtrack.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="index.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="sdlcreatethread.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">SDL_CDtrack</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="reference.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">SDL_CreateThread</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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