Re: Access violation from palloc, Visual Studio 2005, C-language function

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Kevin Flanagan" <kevin-f(at)linkprior(dot)com>
Cc: "'PostgreSQL-development'" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Access violation from palloc, Visual Studio 2005, C-language function
Date: 2010-03-10 18:50:30
Message-ID: 18814.1268247030@sss.pgh.pa.us
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"Kevin Flanagan" <kevin-f(at)linkprior(dot)com> writes:
>>> Hard to tell without seeing the actual code and a stack trace, but I'd
>>> bet that you haven't fully resolved the build process problems you
>>> mentioned earlier.

> I've attached a zip of the (tiny) project, and a text file with the contents
> of the module containing the C-language functions. The only difference from
> sample code is that (as pointed out by Takahiro Itagaki in his post here of
> 8th March) the function implementations need decorating with
> __declspec(dllexport).

Mph. I don't actually believe that, nor do I believe the #define
BUILDING_DLL you put in, because neither of those are needed in any of
our contrib modules. What I suspect at this point is that the reference
to CurrentMemoryContext in the palloc() macro is being bollixed by
having the wrong value for BUILDING_DLL. However, not having a Windows
build environment to experiment with, I'll have to defer to somebody
with more experience in that.

(I wonder BTW if we should rename BUILDING_DLL, because it seems a bit
misnamed. AIUI it's supposed to be set while building the core backend,
not while building loadable modules.)

regards, tom lane

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