1. A method for processing a cross-thread interrupt directed from a requesting thread to a destination thread in a multithreaded processor, the method comprising the steps of: receiving a request for delivery of the cross-thread interrupt to the destination thread; determining whether the destination thread of the cross-thread interrupt is enabled for receipt of cross-thread interrupts; and utilizing a thread identifier to control delivery of the cross-thread interrupt to the destination thread if the destination thread is enabled for receipt of cross-thread interrupts.