Implemented thread priority as the 'nice' value on Linux.  High priority threads require root permissions (you shouldn't give your game root permissions though!)

Updated copyright to LGPL version 2.1 and year 2010

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The thread ID is an unsigned long so it can hold pthread_t so people can do naughty things with it.

I'm going to be adding additional useful thread API functions, but this should prevent crashes in people's existing code on 64-bit architectures.

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stopping and starting in rapid succession.

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Removed SDL_KillThread() from the API, as it isn't safe on many platforms.

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The current SVN trunk is missing the SDLCALL specifier at numerous locations.

It has to be added for all (possibly user provided) callbacks.

I stumbled over this while creating a makefile for the OpenWatcom compiler for
Win32.

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memory leak in SDL_thread.c

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Make sure every source file includes SDL_config.h, so the proper system
headers are chosen.

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FIXME:
Change #include <stdlib.h> to #include "SDL_stdlib.h"
Change #include <string.h> to #include "SDL_string.h"
Make sure nothing else broke because of this...

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using Visual C++ 2005

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I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.

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This was mostly, if not entirely, written by "Doodle" and "Caetano":
    doodle@scenergy.dfmk.hu
    daniel@caetano.eng.br

--ryan.

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