Synchronization in PHP ??

PHP has an interface to SysV semaphores:

http://www.php.net/manual/en/function.sem-acquire.php

flock is also available for file-based inter-process synchronization.

On Mar 16, 11:52 pm, Hermann <Hermann.Rich...@gmail.comwrote:

Quote: Originally Posted by Does exist any form of synchronization in PHP?? Namely locks, mutexes, semaphores, monitors, etc... > Thanks in advance. Regards.

Hermann wrote:

Quote: Originally Posted by Does exist any form of synchronization in PHP?? Namely locks, mutexes, semaphores, monitors, etc... > Thanks in advance. Regards. >

What kind of synchronization are you trying to do?

In general, PHP scripts don't talk to each other like they can in other
languages. There is a limited interface, but it's system dependent. So
there are some things you *can* do in PHP, but PHP may not necessarily
be the *best* language to do them in.

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petersprc wrote:

Quote: Originally Posted by PHP has an interface to SysV semaphores: > http://www.php.net/manual/en/function.sem-acquire.php > flock is also available for file-based inter-process synchronization. > On Mar 16, 11:52 pm, Hermann <Hermann.Rich...@gmail.comwrote: Quote: Originally Posted by >Does exist any form of synchronization in PHP?? >Namely locks, mutexes, semaphores, monitors, etc... >> >Thanks in advance. >Regards. >

and if interfacing to Mysql, there are lock facilities in that.

Jerry Stuckle wrote:

Quote: Originally Posted by Hermann wrote: Quote: Originally Posted by >Does exist any form of synchronization in PHP?? >Namely locks, mutexes, semaphores, monitors, etc... >> >Thanks in advance. >Regards. >> > What kind of synchronization are you trying to do? > In general, PHP scripts don't talk to each other like they can in other languages. There is a limited interface, but it's system dependent. So there are some things you *can* do in PHP, but PHP may not necessarily be the *best* language to do them in. >

Quite.

If you have some heavy realtime interactive-across-many-web-interfaces
type problem, the better answer is to use php to do the user interface
parts, and have some core daemon written in 'C" or suchlike handling all
the interactivity bits.

And write a PHP extesnion to access it.

Alright guys. Perfectly clear. Thank you all by your replies.

I just need to do an atomic test-and-set in a MyISAM table (a global
shared variable for the whole website).
But I think it would be better if I use a shared variable. Those that
are provided by php caching packages.
Actually, I read that eAccelerator has a lock function in its API, so
that would be perfect.