(Pardon the delayed comments... I'm several thousand (!) emails behind
at the moment.)
I finally can delurk and contribute, sort of!
At 04:59 PM 3/9/00 -0500, Dan Sugalski wrote:
>At 04:12 PM 3/9/00 -0500, Charles Bailey wrote:
>
>>Dan Sugalski <[EMAIL PROTECTED]> wrote:
>>| >1. flock() (don't semantics differ; eg, mandatory?)
>>| | Nope. VMS has mandatory filelocking, enforced by the filesystem.
>>
>>flock() isn't a native part of VMS, though some emulations exist. RMS
>>locking (the intrinsic stuff) is mandatory (unless you bypass it with
>>raw I/O calls) and record-oriented.
>
>That's a pretty low-level bypass, though. IIRC you have to request actual
>disk blocks, which requires PHY_IO or LOG_IO privs.
>
Not necessary in both cases. Use SYS$READ and SYS$WRITE for block I/O
with the BIO (block I/O) or BRO (block and record I/O) options set in
the RAB. No privs needed, but you get raw disk blocks, no interpretation.
To disable locking, play with the various flags UPI (user provided interlock),
RRL (read regardless of lock), NLK (no locking) options. Naturally, my
manuals are in the inconviently powered-down office, and my memory is lost
somewhere with my youth, so you'll have to dig on these further (or ask
me to do so) for more specific info.
Natch, someone has to actually implement these things to make 'em available
to perl....
Eric
--
Eric F. Richards
[EMAIL PROTECTED]
"The weird part is that I can feel productive even when I'm doomed."
- Dilbert
