Re: Flock and file deletion
- From: Gordon <gordon.mcvey@xxxxxxxxxxxx>
- Date: Tue, 30 Sep 2008 01:25:02 -0700 (PDT)
On Sep 30, 1:20 am, Bill H <b...@xxxxxxxxx> wrote:
I am wondering if this is possible. I have a file that is accessed by
multiple users and keeps track of activity (the file is polled by
flash every 2 seconds). As users leave, the flash program tells the
php program to remove them from the activity file, and as users access
this activity file, users who have timed out (haven't been heard from
in 60 seconds) are removed. Using a combination of flock, microsecond
sleeps, loops and the flash file repolling if it doesn't get a
completed result back, I have been able to keep anyone from stepping
on each other.
The question I have is, when the last user exits, I want to delete the
file, but am afraid that the file deletion may step on a user just
coming in and remove their activity. I had the thought of, and this
may be totally stupid, to open the file for read, flock it and delete
it while open. The theory behind this is that the flock would stay
active till the php script ended and the file handle was closed. At
which point the other waiting user would be able to access the file
for writing. Does this make sense?
Bill H
It would probably be easier to just leave the file empty when there
are no users rather than deleting it altogether, as you'd then have to
recreate it when the first user comes back on.
A database is probably going to be a much better solution to this
problem than a file as most database engines have mechanisms to cope
with just this kind of problem.
.
- References:
- Flock and file deletion
- From: Bill H
- Flock and file deletion
- Prev by Date: Re: Installing zend fraemwork on Xampp *******Caution Newbie*************
- Next by Date: Re: Is it possible to end the outermost function from an inner function?
- Previous by thread: Re: Flock and file deletion
- Next by thread: Re: Flock and file deletion
- Index(es):
Relevant Pages
|
