[BRLTTY] Using brlapi simultaneous read and write

[Dave Mielke]

[quoted lines by Siju Samuel on 2013/12/13 at 17:24 -0600]

>When we try to  read and write simultaneously ,  read is handing until a
>keypress is made.
...
>   if (brlapi_readKey(1, &key) > 0) {

brlapi.h: int BRLAPI_STDCALL brlapi_readKey(int wait, brlapi_keyCode_t *code);

As you can see, the first argument of brlapi_readKey() is a boolean which tells 
it whether or not to wait. You pass in 1, which means that it should wait. 
That's why it's blocking until a key is pressed.

Whether or not it's safe to write in one thread while reading in another is a 
question I'd prefer Samuel to answer.

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