Ikkepræemptiv

Ikkepræemptiv refers to a state or condition where preemption does not occur. In computing, this typically relates to the scheduling of processes. A non-preemptive scheduler allows a process to run until it voluntarily relinquishes the CPU, either by completing its execution or by blocking for an I/O operation. Once a process starts running under a non-preemptive system, it cannot be interrupted by another process, even if the other process has a higher priority. This contrasts with preemptive scheduling, where the operating system can interrupt a running process and allocate the CPU to another process, often based on priority or time quantum. Non-preemptive scheduling is simpler to implement but can lead to situations where a long-running process monopolizes the CPU, potentially starving other processes. The term can also be applied more broadly to systems or situations where immediate interruption or displacement is not a characteristic. For instance, in some forms of communication protocols, a message might be considered non-preemptive if it must be delivered in its entirety without being interrupted by subsequent messages. The choice between preemptive and non-preemptive approaches depends on the specific requirements of the system, such as fairness, responsiveness, and predictability.