Andrew Dunstan wrote:

> I have verified that it does indeed work. Underneath the hood it uses  
> the native call LockFileEx() see win32io.c in Perl source. I suggest we  
> should switch from this flaky use of Global namespace to having the  
> postmaster acquire an explicit lock on a file in the datadir.

Does it work for all backends to grab a lock, so that if they continue
to live after postmaster has died, then the new postmaster cannot start?

I guess the postmaster could try-acquire an exclusive lock and all other
processes would acquire a shared lock.

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.

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