> I use two threads to do I/O for a process.
> The I/O takes place either on a socket or
> an I/O device (com port) file descriptor.
>
> Apparently it is not possible to shutdown those
> threads from a third thread, neither using close nor shutdown(2) for
> the socket I/O if the threads are blocked during read.
>
> What methods can one use to unblock such a blocked-on-read
> thread?
The current implementation of FreeBSD pthreads only grants access
to file descriptors to one thread at a time. I think if one thread
tries to close a file descriptor from which another thread is
reading, that the thread trying to close will block until the
read completes.
You can use pthread_kill() or pthread_cancel(). pthread_kill()
should unblock the thread in a read state and return -1 with
errno = EINTR.
There were some bugs with signal handling that were fixed in
-stable, so make sure you are running a relatively recent version.
Dan Eischen
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