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From: Vivek Khera <vivek@khera.org>
Date: Tue, 4 Apr 2006 10:17:18 -0400
To: freebsd-stable <freebsd-stable@freebsd.org>
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Subject: Re: [HACKERS] semaphore usage "port based"?
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On Apr 3, 2006, at 8:07 PM, Marc G. Fournier wrote:

> All PostgreSQL processes use "port * 1000" as their starting port  
> for semId ... if "port * 1000" is reported as in use, the first  
> thing that the PostgreSQL process does is kill(PID, 0) the PID  
> returned by semctl(GETPID) to see if, in fact, there is a process  
> running ... if not, PostgreSQL reuses that semaphore, if not, it  
> goes to (port*1000)+1, and tries again ... until it can find a free  
> semaphore that isn't in use ...

Perhaps you can hack into the postgresql master a flag that alters  
the "1000" parameter, or starts at a port * 1000 + N, then hard-code  
that flag into your startup script per jail.