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Re: [HACKERS] Threads vs Processes (was: NuSphere and PostgreSQL

From: Manfred Spraul <manfred(at)colorfullife(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Claudio Natoli <claudio(dot)natoli(at)memetrics(dot)com>,Robert Treat <xzilla(at)users(dot)sourceforge(dot)net>,Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org,pgsql-hackers-win32(at)postgresql(dot)org
Subject: Re: [HACKERS] Threads vs Processes (was: NuSphere and PostgreSQL
Date: 2003-09-25 16:03:00
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Lists: pgsql-hackerspgsql-hackers-win32
Tom Lane wrote:

>Claudio Natoli <claudio(dot)natoli(at)memetrics(dot)com> writes:
>>>How are you dealing with the issue of wanting some static variables to
>>>be per-thread and others not?
>>To be perfectly honest, I'm still trying to familiarize myself with the code
>>sufficiently well so that I can tell which variables need to be per-thread
>>and which are shared (and, in turn, which of these need to be protected from
>>concurrent access).
No. Not protected from concurrent access. Each thread must have it's own 

>Well, the first-order approximation would be to duplicate the current
>fork semantics: *all* static variables are per-thread, and should be
>copied from the parent thread at thread creation.  If there is some
>reasonably non-invasive way to do that, we'd have a long leg up on the
There is a declspec(thread) that makes a global variable per-thread. 
AFAIK it uses linker magic to replace the actual memory accesses with 
calls to TlsAlloc() etc. Note that declspec(thread) doesn't work from 
within dynamic link libraries, but that shouldn't be a big problem.


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