Patents by Inventor William H. Hartner

William H. Hartner has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of using collaborative spinlocks to provide exclusive access to a resource in a multiprocessor computer system
    Patent number: 5966543
    Abstract: A multiprocessor computing system has memory shared by all processors of the computing system and includes an symmetric multiprocessor (SMP) operating system and at least one external device controlled by a device driver. The device driver is typically written to run in a uniprocessor environment. A method for protecting the execution state of the device driver uses a pair of "collaborative" spinlocks, an interrupt time spinlock and a task time spinlock. At task time, prior to calling the device driver, the task time spin lock is acquired by the operating system. The operating system then waits until the interrupt time spinlock is in an "unowned" state before calling the device driver. Upon return from the device driver, the operating system releases the task time spinlock. At interrupt time, prior to calling the device driver's interrupt handler, the interrupt time spinlock is acquired by the operating system. The operating system then determines if the task time spinlock is owned.
    Type: Grant
    Filed: June 26, 1997
    Date of Patent: October 12, 1999
    Assignee: International Business Machines Corporation
    Inventors: William H. Hartner, David Medina, Mark A. Peloquin, Charles R. Schmitt, James F. Macon, Jr.