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Re: old prebinding workaround causes lossage in server-1.3

I do wonder how this is related to prebinding at all? Other than anything that changes the environment can cause a race condition to be hit. Or not hit.


I don't actually know what this code is doing, but it's never thread safe to pull events from the windowserver. Doesn't matter if it's Carbon, Cocoa, or something else. Not thread safe.

If this function pulls events from the Windowserver, then it isn't thread safe. (All keys go to the windowserver and are then dispatched to the application by the windowserver).

Also, InitHLTB() should be useless. It just calls CFInitialize and InitCarbonCore(). _InitCarbonCore() is a no-op that just returns immediately (it doesn't even initialize the happy fun table). And InitHLTB() only ever seems to be called by QuickTime. So I'm not sure why it exists.


Ack, at 11/29/07, Ben Byer said:

DarwinHandleGui in quartz/quartzStartup.c contains this note:
    /* Initially I ran the X server on the main thread, and received
       events on the second thread. But now we may be using Carbon,
       that needs to run on the main thread. (Otherwise, when it's
       prebound, it will initialize itself on the wrong thread)

       grr.. but doing that means that if the X thread gets scheduled
       before the main thread when we're _not_ prebound, things fail,
       so initialize by hand. */

    extern void _InitHLTB(void);

    _InitHLTB();
    X11ControllerMain(argc, argv, server_thread, NULL);
    exit(0);

So, there's been a longstanding, known race condition here -- which may be caused by this workaround for a problem which shouldn't actually exist on Leopard, since we no longer even do prebinding. 

--


Sincerely,
Rosyna Keller
Technical Support/Carbon troll/Always needs a hug

Unsanity: Unsane Tools for Insanely Great People

It's either this, or imagining Phil Schiller in a thong.
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