Priority (data-processing)
See also: Priority
The priority is a characteristic of a data-processing Tâche making it possible to determine its access to a resource.
A task corresponds to a treatment to realize. A resource is a means making it possible to carry out the task.
Example: priority of the processes
In an operating system multitasks, the processes (corresponding for example to a program of a user) are in competition to have access to the processor. The ordonnancor is the part of the operating system which allots priorities to the processes. In fact the priority process reaches the processor. After treatment by the processor, this process will not have any more priority, so as to leave the resource to other processes.
Example: priority of the interruptions
On a mother chart, peripherals managing the input-outputs (eg. keyboard, printer…) must be been useful regularly by the processor, unless they do not have a Direct access report or DMA. The priority is not given to the fastest peripheral but rather to the peripheral which cannot wait. Thus, in the old punched-card machines, the Card reader, which sent a interruption to each column read had the highest priority, the more so as the treatment of each column took only some cycles and hardly penalized the remainder.
See too
- Inversion of priority
- Scheduling
- Theory of scheduling
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