Re: Flock and file deletion
- From: "C. (http://symcbean.blogspot.com/)" <colin.mckinnon@xxxxxxxxx>
- Date: Tue, 30 Sep 2008 05:26:11 -0700 (PDT)
On 30 Sep, 01:20, 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
PHP's file handling does not handle contention well. You could
displace the lock to a different file but this is totally the wrong
way to solve the original problem - which is keeping track of user
sessions.
The quickest route to the right way of doing things is to use a custom
database bound session handler.
C.
.
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- From: Bill H
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