[PATCH 2/4] X event queue mutex

[Tiago Vignatti]

Simon Thum escreveu:
> I believe tiagos words are a bit misleading: The mutex makes it possible 
> to block event enqueuing, which is needed to guarantee order of events 
> enqueued on the main thread. If I got it right, the intent is to 
> 'emulate' OsBlockSignals(), though I'm missing that bit.

Good point, Simon. I forgot about this discussion which we had in XDS.

Given that there's only one thread to take care about all the input 
devices this would not be a problem with *devices*. Events will be 
serialized is this case. But the problems eventually can happen if the 
others guys that enqueue events (nested servers, DGA, maybe also XTest) 
try to do it at the same time with the devices. A mutex is needed in 
this situation.

But yeah, I really have to carefully trace these weird paths to 
guarantee nothing bad occurs.


Thank you,

-- 
Tiago Vignatti
C3SL - Centro de Computação Científica e Software Livre
www.c3sl.ufpr.br