Re: [HACKERS] 8.2.3: Server crashes on Windows using Eclipse/Junit

From: Magnus Hagander <magnus(at)hagander(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Trevor Talbot <quension(at)gmail(dot)com>, PostgreSQL <pgsql-general(at)postgresql(dot)org>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [HACKERS] 8.2.3: Server crashes on Windows using Eclipse/Junit
Date: 2007-10-22 20:45:02
Message-ID: 471D0BCE.8020100@hagander.net
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Tom Lane wrote:
> Magnus Hagander <magnus(at)hagander(dot)net> writes:
>> I was planning to make it even easier and let Windows do the job for us,
>> just using RegisterWaitForSingleObject(). Does the same - one thread per
>> 64 backends, but we don't have to deal with the queueing ourselves.
>> Should be rather trivial to do.
>
> How can that possibly work? Backends have to be able to run
> concurrently, and I don't see how they'll do that if they share a stack.

We're not talking about the backends, we're talking about the backend
waiter threads whose sole purpose is to wait for a backend to die and
then raise a signal when it does. We can easily have the kernel wait for
a whole bunch of them at once, and have it call our callback function
whenever anyone of them dies.

//Magnus

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