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help / color / mirror / Atom feedFrom: Kris Jurka <books@ejurka.com>
To: Alexander Wöhrer <woehrer@par.univie.ac.at>
Cc: pljava-dev@pgfoundry.org
Cc: pgsql-hackers@postgresql.org
Subject: Re: [Pljava-dev] stack depth limit exceeded - patch possible?
Date: Mon, 14 Apr 2008 11:23:46 -0400 (EDT)
Message-ID: <Pine.BSO.4.64.0804141112330.5378@leary.csoft.net> (raw)
In-Reply-To: <58782.88.116.137.78.1208177811.squirrel@www.par.univie.ac.at>
References: <48010499.30000@par.univie.ac.at>
<Pine.BSO.4.64.0804131023000.9928@leary.csoft.net>
<58782.88.116.137.78.1208177811.squirrel@www.par.univie.ac.at>
On Mon, 14 Apr 2008, Alexander Wöhrer wrote:
> am I understanding this correctly that pl/java sets it for the main Java
> thread, so other threads spawned by this main thread and using postgres
> SPI functionality will run into stack_depth_problems?
pljava sets the stack_base_ptr for each thread just before it calls into
the backend using SPI and resets it when that thread finishes using SPI.
Only one thread can access the backend at a time, so multi-threaded pljava
code is safe and this mangling of the stack_base_ptr keeps the backend
happy.
> Can you suggest another workaround?
>
Are you having any actual problems or is this all theoretical? I don't
believe you should be having any issues, but if you're having a real
problem, please post a self-contained test case so we can look into it.
Kris Jurka
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To: pljava-dev@postgresql.org
Cc: books@ejurka.com, woehrer@par.univie.ac.at, pljava-dev@pgfoundry.org, pgsql-hackers@postgresql.org
Subject: Re: [Pljava-dev] stack depth limit exceeded - patch possible?
In-Reply-To: <Pine.BSO.4.64.0804141112330.5378@leary.csoft.net>
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