Re: uptime() for postmaster

Hi Tom,

Am 31.12.2004 um 20:18 schrieb Tom Lane:

> Matthias Schmidt <schmidtm@mock-software.de> writes:
>> a) is the name uptime() OK?
>
> Probably should use pg_uptime(), or something else starting with pg_.

What about 'pg_starttime()' since it is not a period but a 
point-in-time?

>
>> b) is the return-type 'Interval' OK?
>
> It might be better to return the actual postmaster start time (as
> timestamptz) and let the user do whatever arithmetic he wants.
> With an interval, there's immediately a question of interpretation
> --- what current timestamp did you use in the computation?
> I'm not dead set on this, but it feels cleaner.

you're right. Let's go for timestamptz and let the users decide ...
>
>> c) does it make sense (... fit in the scheme?) to place the code here:
>>      src/backend/utils/misc/uptime.c
>
> No.  This sort of stuff should go into utils/adt/.  I'd be inclined to
> drop the function into one of the existing timestamp-related files
> rather than make a whole new file just for it.  Someplace near the
> now() function would make sense, for instance.

yep - so the stuff goes to: utils/adt/timestamp.c, where now() and many other time-related functions are.

>
>> d) Can I piggy-back on 'BackendParameters' to get postmasters
>> start-time to the backends?
>
> AFAICS you have no other choice.
>
>             regards, tom lane
>
>

cheers,

Matthias

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