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From: David Xu <davidxu@freebsd.org>
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Date: Wed, 22 Mar 2006 16:11:07 +0800
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Subject: Re: Process hanging on 6.0-STABLE
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=D4=DA Wednesday 22 March 2006 15:25=A3=ACDaniel O'Connor =D0=B4=B5=C0=A3=BA
> Hi,
> I work for a small company that makes radar systems for research=20
> organisations and we use FreeBSD on the PCs for data acquisition and=20
> processing. We have recently shifted to FreeBSD6/amd64 and one machine in=
=20
> particular is exhibiting a strange problem.
>=20
> The acquisition process is a Tcl interpreter with a largish chunk of C co=
de
>  which talks to the hardware (via RS485 and a custom PCI card). Once the=
=20
> system is set up it streams data back via the PCI card and runs it through
>  various data processors (eg dump raw data to disk, FFT, winds, etc..).=20
>=20
> The actual forking of processes is handled in Tcl and the C code only gets
>  involved to write the data out (to an FD the Tcl layer keeps).
>=20
> The problem is that every now and then the process gets stuck and becomes
>  unkillable just after forking, ie..
Are you using pthreads ?

David Xu