Apparatus and method to guarantee forward progress in execution of threads in a multithreaded processor

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United States of America Patent

PATENT NO 6105051
SERIAL NO

08956875

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Abstract

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A system and method for performing computer processing operations in a data processing system includes a multithreaded processor and thread switch logic. The multithreaded processor is capable of switching between two or more threads of instructions which can be independently executed. Each thread has a corresponding state in a thread state register depending on its execution status. The thread switch logic contains a thread switch control register to store the conditions upon which a thread will occur. The thread switch logic has a time-out register which forces a thread switch when execution of the active thread in the multithreaded processor exceeds a programmable period of time. Thread switch logic also has a forward progress count register to prevent repetitive thread switching between threads in the multithreaded processor. Thread switch logic also is responsive to a software manager capable of changing the priority of the different threads and thus superseding thread switch events.

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Patent Owner(s)

  • INTERNATIONAL BUSINESS MACHINES CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Borkenhagen, John Michael Rochester, MN 57 1943
Eickemeyer, Richard James Rochester, MN 34 1474
Flynn, William Thomas Rochester, MN 14 1473
Kunkel, Steven R Rochester, MN 25 526
Levenstein, Sheldon Bernard Rochester, MN 16 517
Wottreng, Andrew Henry Rochester, MN 18 1299

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