| From: | Craig Ringer <craig(at)2ndquadrant(dot)com> |
|---|---|
| To: | Rajashree Mandaogane <rajashree(dot)28m(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Global flag |
| Date: | 2014-03-24 11:59:08 |
| Message-ID: | 53301E0C.8020702@2ndquadrant.com |
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| Lists: | pgsql-hackers |
On 03/24/2014 06:28 PM, Rajashree Mandaogane wrote:
> I need to set a global flag in such a way that only if the flag is on
> then my modified code will get executed, so how can I do that?
PostgreSQL is single-threaded, multi-processing. So if you need to set
this flag only within a given backend, just make it a global variable.
If you want it to be global across all back-ends, you may want a GUC
(see the docs & source code). However, IIRC GUC changes aren't visible
to all backends immediately.
If you need something that's immediately visible, I imagine you'll want
a lock or mutex.
--
Craig Ringer http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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