Re: [naviserver-devel] Module unloading

[Vlad S. <vl...@cr...>]

I agree, i was just surprised that DB driver never calls DbClose on 
exit, if i need to do it i have to write proc that will call ns_db 
bouncepool for every registered pool on server exit

for Berkeley Db module i will do on_exit callback internally but just 
wanted to see other opinions on the topic in general

Andrew Piskorski wrote:
> On Mon, May 01, 2006 at 01:23:52PM -0400, Vlad Seryakov wrote:
> 
>> Subject: Module unloading
> 
> Well, don't think you're talking about module unloading at all
> (good!).  You seem to be talking about callbacks to call when shutting
> down the Naviserver process.
> 
>> Funny thing i encountered today, working with Berkeley module, i 
>> discovered that once loaded, DB driver is never closed, in case of DB it 
>> needs to be closed otherwise datafile can be corrupted.
> 
> What do you mean the, "DB driver is never closed"?  What is the actual
> problem, specifically?
> 
>> I am thinking to make it more generic, to add Ns_ModuleShutdown call to 
>> the modules and if defined, register it and on server shutdown call them 
>> in reverse order. Each module will decide what to do it if such public 
> 
> There is already a Tcl ns_atshutdown command.  Is it not sufficient
> for whatever special case handling you need to do for you use of
> Berkeley DB on Naviserver process shutdown?
> 
>> And for nsdb module i would close all pools on exit, for SQL drivers 
>> that is not the problem but for others it could be important.
> 
> If it's not necessary, why do it?  Could it hang or otherwise break or
> delay orderly process shutdown?  If not, then it seems like a
> reasonable and maybe desirable thing to do.  And if it is desirable,
> why not just do it by default all the time, for all nsdb database
> pools?
> 

-- 
Vlad Seryakov
571 262-8608 office
vl...@cr...
http://www.crystalballinc.com/vlad/