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Re: [Chicken-users] Pipe and thread problem

From: Felix
Subject: Re: [Chicken-users] Pipe and thread problem
Date: Wed, 24 Oct 2012 08:04:37 -0400 (EDT)

From: Aaron Patterson <address@hidden>
Subject: [Chicken-users] Pipe and thread problem
Date: Tue, 23 Oct 2012 14:30:57 -0700

> Hi, I'm trying to simulate reading from a TTY that writes every two
> seconds.  I want to do this with a pipe and two threads, one thread
> writes every N seconds, while the other reads any data available on the
> pipe.
> Unfortunately, my code just hangs.  After speaking with the fine people
> in #chicken, it seems that this may be a bug.  We played with different
> calls to put the threads to sleep, and different functions to read data,
> but they all ended up freezing at some point.

The ports obtained from calls to "open-[input|output]-file*" use
internally the "stream-port" class (ports on FILE* streams, in this
case created via fdopen(3)). These are not thread-aware, AFAICT. Ports
created for socket-fd's (tcp.scm) and processes (posixunix.scm, see
specifically ##sys#custom-[input|output]-port") apparently do.


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