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Hanging at open-input-pipe now and then

From: Roland Orre
Subject: Hanging at open-input-pipe now and then
Date: Fri, 06 Feb 2004 12:01:41 +0100

Lately it happens quite often that I get a hanging (in 1.7), but
breakable, when doing somthing like:

(let* ((in0 (open-input-pipe (string-append "zcat " fname)))
       (buf (read-line in0))
       (in (begin
             (close-pipe in0)
             (open-input-pipe (string-append "zcat " fname))))

This hanging can occur rather soon after a restart. When it starts to
happen it will happen again after every 2-20 tries. When the hanging
does not start to happen I can do this several tousand times in a row
without problems.

I haven't investigated this very deeply yet, but just an observation.
The guardian pipe-guardian used in ice-9/popen.scm always have two
reachable pointers after gc, despite the pointers can't be reached.

Anyone else having similar problems?

        Best regards
        Roland Orre

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