System and method for space efficient object locking using a dat

Details System and method for space efficient object locking using a dat System and method for space efficient object locking using a dat

1995-12-08

1997-12-23

Black, Thomas G.

395619, 395612, 395614, G06F 1730

Patent

active

057014701

ABSTRACT:
In summary, the present invention is a multithreaded computer system having a memory that stores a plurality of objects and a plurality of procedures. Each object has a lock status of locked or unlocked, and includes a data pointer to a data structure. The system uses a first object locking procedure to service lock requests on objects that have never been locked as well as object that have not recently been locked, and uses a second object locking procedure to service lock requests on locked objects and object that have been recently locked. The first object locking procedure has instructions for changing a specified unlocked object's lock status to locked, for copying the data structure referenced by the data pointer to an enlarged data structure including a lock data subarray for storing lock data, and for updating the data pointer to point to the enlarged data structure. The second object locking procedure has instructions for updating a specified object's stored lock data. A lock data cleanup procedure, executed when the system's garbage collection procedure is executed, releases the lock data subarray of a specified object if the object has not been recently locked.

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