keskeytymättömyydestä

Keskeytymättömyys, also known as non-preemptivity, is a fundamental concept in computer science and operating systems, particularly in the context of process scheduling and interrupt handling. It refers to the property of a system where a lower-priority process or task cannot be interrupted by a higher-priority process or task until it voluntarily yields control of the processor.

In non-preemptive systems, once a process starts executing, it continues to run until it completes its execution or voluntarily releases the CPU. This approach has several advantages, including simplicity in implementation and reduced overhead due to context switching. However, it can also lead to issues such as priority inversion, where a lower-priority process holds a resource needed by a higher-priority process, causing the higher-priority process to be delayed.

Keskeytymättömyys is often contrasted with preemptive systems, where a higher-priority process can interrupt a lower-priority process at any time. Preemptive systems are generally more responsive and can better handle real-time requirements, but they also introduce additional complexity and overhead due to frequent context switching.

The choice between non-preemptive and preemptive scheduling depends on the specific requirements of the system. Non-preemptive systems are often used in simpler, less time-critical applications, while preemptive systems are preferred in more complex, real-time environments.