> > For example we have a thread, this thread handle the file
> > IO. When I'm wating for some data I can use the select
> > function to check it out if there is anything for me. If I
> > want to stop the thread during the select, I have no other
> > way except for the signal handlers functions.
> > It is not really handy, because the example above is too
> > simple. In our case is much more difficulter.
>
> Signal handling should do the job fine.
No, that's not right (and would be _really_ happy to stand
corrected). select and signals for interruption are not
compatible. You always have a race condition between unblocking the
signal and actually getting into select. AFAIK POSIX defines the
pselect call for this problem which also introduces a signal mask
argument. Without this, signals are useless to interrupt select.
Greetings
Christoph
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