| From: | "Matthew N(dot) Dodd" <winter(at)jurai(dot)net> |
|---|---|
| To: | Michal Mosiewicz <mimo(at)interdata(dot)com(dot)pl> |
| Cc: | pgsql-hackers(at)postgreSQL(dot)org |
| Subject: | Re: [HACKERS] Memory mapping (Was: Safe/Fast I/O ...) |
| Date: | 1998-04-15 02:13:54 |
| Message-ID: | Pine.BSF.3.96.980414221111.7475L-100000@sasami.jurai.net |
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| Thread: | |
| Lists: | pgsql-hackers |
On Wed, 15 Apr 1998, Michal Mosiewicz wrote:
> isolated from files it's possible to close some descriptors without
> throwing buffers. However it seems (tried it) that memory mapping works
> even after a file descriptor is closed. So, is this possible to cross
> the limit of open files by using memory mapping? Or maybe the descriptor
> remains open until munmap call? Or maybe it's just a Linux feature?
Nope, thats how it works.
A good friend of mine used this in some modifications to INN (probably in
INN -current right now).
Sending an article involved opening the file, mmapping it, closing the fd,
writing the mapped area and munmap-ing.
Its pretty slick.
Be careful of the file changing under you.
/*
Matthew N. Dodd | A memory retaining a love you had for life
winter(at)jurai(dot)net | As cruel as it seems nothing ever seems to
http://www.jurai.net/~winter | go right - FLA M 3.1:53
*/
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