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Technical Examples
A method and apparatus for managing the execution on guest processors of a broadcast instruction requiring a corresponding operation on other processors of a guest machine. Each of a plurality of processors on an information handling system is operable either as a host processor under the control of a host program executing on a host machine or as a guest processor under the control of a guest program executing on a guest machine. The guest machine is defined by the host program executing on the host machine and contains a plurality of such guest processors forming a guest multiprocessing configuration. A lock is defined for the guest machine containing an indication of whether it is being held by a host lock holder from the host program and a count of the number of processors holding the lock as guest lock holders. Upon decoding a broadcast instruction executing on a processor operating as a guest processor, the lock is tested to determine whether it is being held by a host lock holder. If the lock is being held by a host lock holder, an instruction interception is recognized and execution of the instruction is terminated. If the lock is not being held by a host lock holder, the lock is updated to indicate that it is being held by the guest processor as a shared lock holder, the instruction is executed, and then the lock is updated a second time to indicate that it is no longer being held by the guest processor as a shared lock holder.