Re: fork() and dynamically loaded c functions....

From: Jay Flattery <jaycode(at)rocketmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: fork() and dynamically loaded c functions....
Date: 2010-08-10 23:29:08
Message-ID: 228368.49208.qm@web120109.mail.ne1.yahoo.com
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Thanks for your reply

>> I now fork() a process in _PG_Init() (both processes interact), but when I
>> shutdown postgre I get: LOG: failed to find proc 0x1331110 in ProcArray

>What exactly is that child process doing? It sure sounds like it thinks
>it's a valid backend.

Actually it's not doing anything, as I'm just trying to work it all out - just a

bunch of printfs and waits.
But the library is a PG_MAGIC_MODULE.

I tried killing it with pg_terminate_backend(pid) - but I get WARNING: PID
1166738497 is not a PostgreSQL server process. (Interestingly the child
pid=28629, which was printed in the line before)

>You can fork something if you like, but it had absolutely better not
>touch any part of shared memory afterwards.

Sure - it is intended to run independently.

Is there an internal pfork() or something similar I should use instead?

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