Priority differentiated subtree locking
US7206776B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2002 |
| Grant date | Apr 17, 2007 |
| Priority date | — |
| Expiry date | Dec 31, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99938
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A locking arrangement for data structures is provided that prevents deadlocks, but still allows different threads to simultaneously obtain locks on different nodes of a data structure for both read and write operations. The locking system will fail a request to lock one or more resources in a data structure if access to those resources has already been restricted by a conflicting lock of an equal or higher priority. The locking system may also employ preemptable and non-preemptable locks such that, if a preemptable lock with a lower priority has restricted access to resources, then the locking system will preempt the lower priority lock in favor of a conflicting higher priority lock. Alternately, if a non-preemptable lock with a lower priority has restricted access to resources, then the locking system will wait until the lower priority lock is removed before implementing a requested conflicting higher priority lock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.