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Date:      Thu, 20 Jul 2000 15:30:31 +0800
From:      "Tan Juay Kwang" <tanjk@i-dns.net>
To:        <freebsd-questions@freebsd.org>
Subject:   pthreads on 4.0-STABLE
Message-ID:  <NEBBLKHLGDECFCNMHPEECEMPCOAA.tanjk@i-dns.net>
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[-- Attachment #1 --]

Hi, I've got some questions regarding pthreads programming on the FBSD
4.0-STABLE platform. I've 2 scenarios which I hope somebody can help me
out.

The first involves using pthread_create to generate several threads that
basically calls gethostbyname(3). I realize that I can only create 2
threads at the most. Anything more, gethostbyname will never return and
thus the program will hang indefinitely. The same program runs fine on
Solaris 7 and RedHat 6.2

The second involves creating a thread that will block on a file I/O.
According to materials which I've read, a call to open a named pipe read
only will block until some other process opens it for writing. So the
scenario is that I've a main thread that uses pthread_create to spawn
another thread which will block on such an I/O, ie on the open(2) system
call. The anomaly is that the pthread_create does not return until that
I/O is completed. The call returns when I explicitly writes something to
it. The thread does more then just trying to open a file, but that is the
only point where it will block indefinitely. I tried the same thing on
RedHat 6.2 and it all works fine. I haven't try it on Solaris though.

Any help appreciated.

Many thanks and best regards,
Juay Kwang

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