[Help-smalltalk] Good/bad news on the segmentation violation and hangups

[Paolo Bonzini]

Good news: I've found the cause of the segmentation violation: it's two
stupid mistakes on my part.  1) I was not protecting well enough the queue
of semaphores to be signalled and this caused sharing problems.  2) I was
stupidly reallocating the array of `struct pollfd's under the
filePollingHandler's feet.  Both of these are fixed.

Bad news: the cause of the hangups is much worse than I thought: Linux does
not generate SIGIO when output is possible for tty devices!!!  I guess the
only possibility is to do output by polling repeatedly, and input using
SIGIO/SIGURG.

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