Posted by Chris Hope on 09/18/05 23:38

Bill Godfrey wrote:

> Hiya. I'm sure this question has come up on this group many times
> before, but I can't find any prior discussion. (Appologies if I missed
> it.)
>
> I have a PHP program looking a bit like this.
>
> Read a load of data over the network from node 1.
> Process the data.
> Read a load of data over the network from node 2.
> Process the data.
> ...
> Read a load of data over the network from node n. (2<n<50)
> Process the data.
> Combine all the data together and report.
>
> The time spent waiting for the remote node could be better spent
> processing the data. I'd also like to make many requests at the same
> time, rather than waiting for one to report before making the next
> request.
>
> In short...
>
> For each node, start a ReadAndProcess thread.
> Wait for each thread to report back in the order they complete.
> Once all threads have reported, sort, combine and report.
>
> How do PHP developers do this please?
>
> (If I were using C#, I'd create and start a Thread for each node. The
> main thread would then enter a Monitor.Wait state as each worker
> thread performed a Monitor.Pulse on completion, leaving data in a
> shared object.)
>
> Bill, context switch!

There's no threading as far as I am aware but you can fork subprocesses:
http://www.electrictoolbox.com/article/php/process-forking/

--
Chris Hope | www.linuxcdmall.com

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