Electrical computers and digital processing systems: virtual mac – Virtual machine task or process management
Reexamination Certificate
2005-01-25
2010-10-26
An, Meng-Ai (Department: 2195)
Electrical computers and digital processing systems: virtual mac
Virtual machine task or process management
Reexamination Certificate
active
07823150
ABSTRACT:
Under the present invention, a locking primitive associated with a shared data object is automatically transformed to allow multiple read-only locks if certain conditions are met. To this extent, when a read-only lock on a shared data object is desired, a thread identifier of an object header lock word (hereinafter “lock word”) associated with the shared data object is examined to determine if a read-write lock on the shared data object already exists. If not, then the thread identifier is set to a predetermined value indicative of read-only locks, and a thread count in the lock word is incremented. If another thread attempts a read-only lock, the thread identifier will be examined for the predetermined value. If it is present, the thread count will be incremented again, and a second read-only lock will be simultaneously established.
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Grcevski Nikola
Stoodley Kevin A.
Stoodley Mark G.
Sundaresan Vijay
An Meng-Ai
Buchheit Brian K.
Garrett Scott M.
International Business Machines - Corporation
Kessler Gregory A
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