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Date: Sun, 11 Aug 2002 15:23:01 -0400
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin-developers AT cygwin DOT com
Subject: Re: SIGCLD (?) problem
Message-ID: <20020811192301.GA9017@redhat.com>
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On Sun, Aug 11, 2002 at 04:08:06PM +0100, Conrad Scott wrote:
>So it looks (to the untrained eye) like a race, but I've not got
>anywhere much myself so I thought I'd punt on this one and hope
>some more wizardly being out there might see something in all
>this.

I don't see how there could be a race.  thread 2 should be the
signal thread.  It would be interesting to see what it is doing.
It sounds like it has not been started or something, which would
make the "wait_for_me" function block forever.

I've made some changes and added some assertions throughout the code.
I don't think they will solve the problem but it may make things a
little clearer if there is a problem.

>p.s. I'll keep this process hung in gdb for the moment in case I
>get enthusiastic tomorrow or someone else wants some more
>information.

Could you check on the value of wait_sig_inited?  Is it non-zero?
The problem is that the process processing thread should not have
to be waiting for this.  Although, it looks like it is possible
for this scenario to happen if a process forks, and then quickly
execs.  My just-checked-in-changes change that behavior.  So,
now if it hangs it should hang in fork.

cgf