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Re: file access permission? [message #170085 is a reply to message #170074]

Sat, 09 October 2010 09:53

jussist(at)gmail(dot)com
Messages: 1
Registered: October 2010

Karma:

Junior Member

On Oct 7, 9:50 pm, Amit Prakash Pawar <amitppawar2...@gmail.com>
wrote:
> I want to create simple file program.
>
> Suppose i have 10 users. and file xyz.txt
>
> When 1st user access file he has authority to read and write.
> but if at the same time 2nd user try to access this file.
> i have to give only read access or put message like wait 1st users
> writing some operation.
>
> How to create such program in PHP.
>
> Please tell me which concept i want to use or any reference tutorial?

How about just simple database table, in which you track the locking?

Tables:
LOCKING:
filename | Contains the filename that is being locked.
user_locking | User id that has the file open. If null, not locked.
lock_started | Timestamp when lock started.
last_action | Timestamp when locking user was active.

When user saves, update all fields to null, or just delete the row. If
user has been inactive for x minutes, clear the lock.

Something similar for queue.
filename | Filename that access has been requested.
user_id | User id in the queue.
requested | Timestamp when access was requested, but denied due to
the locking.

-jussi

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[Message index]

		file access permission? By: Amit Prakash Pawar on Thu, 07 October 2010 18:50
		Re: file access permission? By: Michael Fesser on Fri, 08 October 2010 19:28
		Re: file access permission? By: The Natural Philosoph on Fri, 08 October 2010 20:44
		Re: file access permission? By: Captain Paralytic on Fri, 08 October 2010 21:37
		Re: file access permission? By: The Natural Philosoph on Fri, 08 October 2010 22:34
		Re: file access permission? By: Jerry Stuckle on Fri, 08 October 2010 21:31
		Re: file access permission? By: Peter H. Coffin on Sat, 09 October 2010 03:25
		Re: file access permission? By: jussist(at)gmail(dot)com on Sat, 09 October 2010 09:53

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