Method for controlling process priority in semaphore operation
US5241676A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 15, 1990 |
| Grant date | Aug 31, 1993 |
| Priority date | — |
| Expiry date | May 15, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/52
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In the P operation of a semaphore operation, the semaphore priority set in the semaphore is compared with the process priority of an execution process. When the semaphore priority is higher than the process priority of the execution process, the process priority is changed to the semaphore priority and the process is executed in accordance with the changed process priority. In the V operation, on the other hand, the semaphore priority is compared with the process priority of the first process which is placed in the wait state. When the semaphore priority is higher than the process priority of the first process in the wait state, the process priority is changed to the semaphore priority and the process is placed in the ready state. Furthermore, the process priority of the process in the ready state is compared with the process priority of an execution process. When the process priority of the process in the ready state is higher than the process priority of the execution process, the execution process is placed in the ready state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.