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Restrict simultaneous access to resources

By NPeeters,

This set of procedures allow you to control simultaneous access to any resource you are using. It mimics the behaviour of a Semaphore in programming.

A typical problem where you need this, is when you have a computational intensive procedure you only want to be started a limited number of times.

First, add a record to the Semaphore table, identifying the maximum number of simultaneous 'users' of the resource.
Whenever you need access to that specific resource, you add a call to usp_LockSemaphore to the beginning of your call. If the procedure returns 0 (zero), you can continue using the resource.
After the resource is no longer used, call usp_UnlockSemaphore.

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