Method of isolating a memory location containing an obsolete val

Details Method of isolating a memory location containing an obsolete val Method of isolating a memory location containing an obsolete val

1997-06-19

1999-07-20

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Shared memory area

G06F 1214

Patent

active

059268352

ABSTRACT:
A method of isolating a memory location containing an obsolete value of a variable, in a shared memory of a computer, said location being referenced via a pointer for access in the context of a first transaction, a lock called a "hold" being placed on said location and being assigned to a single task, said hold preventing any other task from accessing said location. The method of the invention does not free the location containing the obsolete value, but it isolates it from transactions other than that transaction which possesses the first pointer. This allows the task owning the first pointer to continue to access said obsolete value. However, any transaction can access another value of the variable, without waiting, because the descriptor of said variable directs said transactions to a location which is freely accessible and contains said other value.

REFERENCES:
patent: 5218698 (1993-06-01), Mandl
patent: 5263155 (1993-11-01), Wang
N. Shavit et al Software Transactional Memory, Proceedings of Fourteenth ACM SIGACT-SIGOPS, Ottawa, Ontario, Canada, Aug. 20, 1995, pp. 204-213.

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