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From: "Marc A. Pelletier" <marc@abovesecurity.com>
To: sdl@libsdl.org
Date: Tue, 13 Sep 2005 10:19:50 -0400
Subject: [SDL] Some multithreaded improvement to the event queue...

Hello all.

I did a small improvement run on SDL_events.c to stratch an itch of mine that
results in the following features:

- SDL_WaitEvent() is now properly blocks the calling thread when there are no
pending events (and wakes it up immediately when events arrive rather than
miss them by up to 10ms because of the SDL_Delay)

- If the event queue gets full, the thread that is adding the events will be
blocked until room becomes available rather than just drop them on the floor.

Both features are only enabled when SDL_INIT_EVENTTHREAD is given to
SDL_Init() and the event thread was created successfuly.  They don't make
sense if you don't have a separate event collection thread anyways.

I've only tested this under Linux, but I use no machine dependent code so
it /should/ work on any platform where threads work correctly.

The included diff was made against 1.2.9.

-- Marc A. Pelletier