A method, system and computer program product for processing in a multiprocessor data processing system are disclosed. The method includes, in response to executing a load-and-reserve instruction in a processor core, the processing core sending a load-and-reserve operation for an address to a lower level cache of a memory hierarchy, invalidating data for the address in a store-through upper level cache, and placing data returned from the lower level cache into the store-through upper level cache.

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> Secure transmission of data within a distributed computer system

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