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What (who) is pre-emptive multitasking - definition
ACT OF TEMPORARILY INTERRUPTING A TASK BEING CARRIED OUT BY A COMPUTER SYSTEM, WITHOUT REQUIRING ITS COOPERATION, AND WITH THE INTENTION OF RESUMING THE TASK AT A LATER TIME
Pre-emptive multitasking; Preemptive multitasking; Pre-emptive multi-tasking; Preemptive multithreading; Time slice; Pre-emptive multithreading; Pre-emptive multitasking operating system; Preemptive scheduler; Pre-emptive scheduler; Preemptive scheduling
pre-emptive multitasking
<operating system, parallel> A type of multitasking where
the scheduler can interrupt and suspend ("swap out") the
currently running task in order to start or continue running
("swap in") another task. The tasks under pre-emptive
multitasking can be written as though they were the only task
and the scheduler decides when to swap them. The scheduler
must ensure that when swapping tasks, sufficient state is
saved and restored that tasks do not interfere.
The length of time for which a process runs is known as its
"time slice" and may depend on the task's priority or its
use of resources such as memory and I/O.
OS/2, Unix and the Amiga use pre-emptive multitasking.
This contrasts with cooperative multitasking where each task
must include calls to allow it to be descheduled
periodically.
(1995-03-20)
Preemption (computing)
In computing, preemption is the act of temporarily interrupting an executing task, with the intention of resuming it at a later time. This interrupt is done by an external scheduler with no assistance or cooperation from the task.
time slice
<operating system> (Or "time quantum", "quantum") The period
of time for which a process is allowed to run uninterrupted in
a pre-emptive multitasking operating system.
The scheduler is run once every time slice to choose the
next process to run. If the time slice is too short then the
scheduler will consume too much processing time but if it is
too long then processes may not be able to respond to external
events quickly enough.
(1998-11-06)
Wikipedia
Preemption (computing)
In computing, preemption is the act of temporarily interrupting an executing task, with the intention of resuming it at a later time. This interrupt is done by an external scheduler with no assistance or cooperation from the task.: 153 This preemptive scheduler usually runs in the most privileged protection ring, meaning that interruption and resuming are considered highly secure actions. Such a change in the currently executing task of a processor is known as context switching.
