how to lock a block of php codes

From: "kelvin" <kelvin_gl@xxxxxxxxxxxx>
Date: 24 Oct 2006 03:48:48 -0700

Hi,

How to avoid one php page be called by 2 at the same time?
How to lock a block of codes in php?

something like

mutex.Lock
//...............
One service one time
//................
mutex.Unlock

Any way to do this?

Thank you,
Kelvin

.

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