OCR A Level Computer Science
1.2.1e: Distributed, embedded, multi-tasking, multi-user and Real Time operating systems.
1.2.1e: Distributed, embedded, multi-tasking, multi-user and Real Time operating systems.
| Keyword | Definition |
|---|---|
| Distributed Operating System | An operating system that is distributed across multiple computers and allows them to work together as a single system. Distributed operating systems provide services such as file sharing and communication between computers, and can improve the performance and reliability of a system by allowing tasks to be distributed across multiple CPUs. |
| Embedded Operating System | An operating system that is designed for use in embedded devices, such as smartphones, tablets, and other small computing devices. Embedded operating systems are typically compact and efficient, and are designed to support the specific functions and features of the device they are running on. |
| Multi-tasking Operating System | An operating system that allows multiple tasks to be executed concurrently, or at the same time. Multi-tasking operating systems provide mechanisms such as preemptive scheduling and multitasking support to allow multiple programs to run concurrently on a single CPU. |
| Multi-user Operating System | An operating system that allows multiple users to use the same computer simultaneously. Multi-user operating systems provide mechanisms such as user accounts and permissions to control access to the system and ensure that users can work independently without interfering with each other. |
| Non-preemptive scheduling | a type of scheduling algorithm that does not allow tasks to be interrupted once they have started executing. |
| Preemptive scheduling | a type of scheduling algorithm that allows a higher-priority task to interrupt and temporarily suspend the execution of a lower-priority task. |
| Real Time Operating System (RTOS) | An operating system that is designed for real-time applications, which require quick and deterministic responses to events. RTOSs provide mechanisms such as real-time scheduling and fast interrupt handling to ensure that critical tasks are executed promptly and reliably. |
