Re: Multiple asynchronous operations

Michael Abbott <[email protected]> Thu, 17 Sep 2009 09:34:28 -0700 (PDT)

Newsgroups	gmane.comp.lib.state-threads.user
Message-ID	<[email protected]>

> that only applies to I/O, as opposed to asynchronous operations in
> general, such as mutex locking, sleeping, or any other user-defined
> asynchronous operation.

Yes and no.  Yes, in that st_poll() does directly support waiting for
I/O only.  No, because other async operations can map to I/O by reading
and writing a pipe or socketpair.  For instance, user-defined lock
functions could write something to a pipe whenever they lock or unlock a
lock, and another thread could poll and read from the pipe to learn when
such actions happen.  This is how we recommend translating UNIX signals
to I/O operations too; see
        http://state-threads.sourceforge.net/docs/notes.html


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