Control process concurrency in PHP

Question

I have programmed a simple app that every X minutes checks if an image has changed in several websites and downloads it. It's very simple: downloads image header, make some CRC checks, downloads the file, stores in a MySQL database some data about each image and process next item...

This process takes about 1 minute to complete.

The problem is I have noticed that while the server is executing this process I cannot access to any page in the website, even those that don't require MySQL.

I don't know why it is happening and I have no clue about how to fix it. Perhaps a more advanced PHP programmer can help me.

what server is it? sounds like your code is hooked to the inner thread — Javier, May 27 '10 at 18:46
The process is a PHP script called via the web ? or is it a cron task ? — Serty Oan, Jun 02 '10 at 13:35
It's a PHP script called via the web, but it is installed in local environment (not production yet) — Ivan, Jun 04 '10 at 09:23

score 0 · Accepted Answer · answered Feb 23 '11 at 19:45

I think this is because of session files locks
Try to unset sessions cookie and load page, if I right - page is loaded

It would be correct to remove execute this script from web, but if this is necessary, use session_write_close() function to close session and unlock session file

Control process concurrency in PHP

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