Electrical computers and digital processing systems: memory – Addressing combined with specific memory configuration or... – Virtual machine memory addressing
Patent
1996-11-04
2000-10-17
Cabeca, John W.
Electrical computers and digital processing systems: memory
Addressing combined with specific memory configuration or...
Virtual machine memory addressing
711152, 711163, 709100, 709102, G06F 1200, G06F 1214, G06F 900
Patent
active
061346276
ABSTRACT:
A method for synchronizing threads in a computer operating under control of a program written in an object-based computer programming language provides for a first thread to lock an object by moving the object header to a stack address and replacing the header with the stack address. The first thread unlocks the object by returning the header to its associated memory location. Second and subsequent threads attempting to access a locked object detect the presence of the stack address in the header memory location and suspend their attempts to access the object. When using aligned stacks, all stack addresses will be even, and all object-headers will be odd. Threads efficiently check the status of the object by testing the least significant bit. A preferred method is implemented in a "JAVA" just-in-time compiler of a "JAVA" virtual machine.
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Anderson Matthew D.
Cabeca John W.
Sun Microsystems Inc.
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