A method and mechanism for controlling threads in a multithreaded multicore processor. A processor includes multiple cores, each of which are capable of executing multiple threads. A control register which is shared by each of the cores is utilized to control the status of the threads in the processing system. In one embodiment, the shared register includes a single bit for each thread in the processor. Depending upon the value written to a bit of the shared register, one of three results may occur with respect to a thread which corresponds to the bit. In one embodiment, writing a "0" to a bit of the shared register will cause a corresponding thread to be Parked. Writing a "1" to a bit of the shared register will cause a corresponding thread to either be UnParked or be Reset. Whether writing a "1" to a bit of the register causes the corresponding thread to be UnParked or Reset depends upon a state of the processor.

 
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