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Date: Mon, 14 Apr 2003 22:08:27 +0100 From: Patrice Mandin Subject: [SDL][PATCH] 2 patches for sdl Here are 2 patches for SDL: - One is to put the dummy video drivers at the end of the video drivers list. It gave me problems, when SDL_VIDEODRIVER is not set, and the dummy driver is used instead of the platform's driver, just because it is always available. So the dummy driver must always be at the end of the list. I suppose picogui and dc video drivers also don't work.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 15 Apr 2003 15:46:56 +0000
parents e5bc29de3f0a
children 355632dca928
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>Chapter 12. Multi-threaded Programming</A
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><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
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>SDL_CreateThread</A
> &#8212; Creates a new thread of execution that shares its parent's properties.</DT
><DT
><A
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>SDL_ThreadID</A
> &#8212; Get the 32-bit thread identifier for the current thread.</DT
><DT
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>SDL_GetThreadID</A
> &#8212; Get the SDL thread ID of a SDL_Thread</DT
><DT
><A
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>SDL_WaitThread</A
> &#8212; Wait for a thread to finish.</DT
><DT
><A
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>SDL_KillThread</A
> &#8212; Gracelessly terminates the thread.</DT
><DT
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>SDL_CreateMutex</A
> &#8212; Create a mutex</DT
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> &#8212; Destroy a mutex</DT
><DT
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> &#8212; Lock a mutex</DT
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> &#8212; Creates a new semaphore and assigns an initial value to it.</DT
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>SDL_DestroySemaphore</A
> &#8212; Destroys a semaphore that was created by <A
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>SDL_CreateSemaphore</A
>.</DT
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>SDL_SemWait</A
> &#8212; Lock a semaphore and suspend the thread if the semaphore value is zero.</DT
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>SDL_SemTryWait</A
> &#8212; Attempt to lock a semaphore but don't suspend the thread.</DT
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>SDL_SemWaitTimeout</A
> &#8212; Lock a semaphore, but only wait up to a specified maximum time.</DT
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> &#8212; Unlock a semaphore.</DT
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> &#8212; Destroy a condition variable</DT
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> &#8212; Restart a thread wait on a condition variable</DT
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> &#8212; Restart all threads waiting on a condition variable</DT
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> &#8212; Wait on a condition variable</DT
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> &#8212; Wait on a condition variable, with timeout</DT
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><P
>SDL provides functions for creating threads, mutexes, semphores and condition variables.</P
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>In general, you must be very aware of concurrency and data integrity issues
when writing multi-threaded programs.  Some good guidelines include:
<P
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>Don't call SDL video/event functions from separate threads</P
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>Don't use any library functions in separate threads</P
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>Don't perform any memory management in separate threads</P
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>Lock global variables which may be accessed by multiple threads</P
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>Never terminate threads, always set a flag and wait for them to quit</P
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>Think very carefully about all possible ways your code may interact</P
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>Note: </B
>SDL's threading is not implemented on MacOS, due to that lack of preemptive thread support (MacOS X dos nt suffer from this problem)</P
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