Locking a resource from a pool while allowing others to order other resources from the pool of resource?

The solution may be to lock the entire table before changing the value of SOMEFIELD. Updating this value is a very quick operation, so even if a few incoming requests to your site need to access the resource pool near-simultaneously, and one request is in the process of changing SOMEFIELD, the others have to wait only a fraction of a second for it to release the lock on the table.

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