[BRLTTY] threaded eSpeak driver

[Dave Mielke]

[quoted lines by Nicolas Pitre on 2012/08/15 at 20:36 -0400]

>Speech drivers are somewhat different as they often rely on external 
>libraries.  And so far only eSpeak seemed to cause problem.  At least 
>that's the only one that generated issue reports.
>
>So this might make sence to move the threading support up a level, 
>making it generic to all speech drivers.

Yes, I believe that'd be a good thing to do.

It might be best to run the speech drivers in an entirely different process for 
at least two reasons. One is that I've seen a case (ViaVoice, I think) where 
the top-level needed to be in the main thread. The other is that we'd then be 
protected from any bad external code polluting brltty's address space.

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