CSE 542: Operating Systems

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CSE 542: Operating Systems Outline - QNX QNX is a real time operating system Real time operating systems: Hard real time systems: Serious penalty for missing deadline E.g. air craft fly-by-wire controls Soft real time systems: Tolerable penalty for missing deadline E.g. t.v. remote operation 26-Jul-19 CSE 542: Operating Systems

CSE 542: Operating Systems Real time systems Scheduling problem: Given tasks with start, execution and deadlines, can we schedule the processes such that we can meet all dead lines If we can’t, then we reject processes Tasks such as VM complicate “execution time” E.g. priority based, preemptive scheduling, rate monotonic scheduling, Execution time Deadline Start 26-Jul-19 CSE 542: Operating Systems

Scheduling algorithms Priority based: Always run the highest priority process Priority inversion: high priority tasks waiting for resources/locks held by lower priority tasks Rate monotonic scheduling Tasks with shortest periods preferred Earliest deadline first Choose the tasks with the nearest deadline 26-Jul-19 CSE 542: Operating Systems

CSE 542: Operating Systems QNX Microkernel based Operating system explicitly invoked (no preemption) All services are composed - kernel only provides message passing and process abstraction 26-Jul-19 CSE 542: Operating Systems

CSE 542: Operating Systems QNX ad 26-Jul-19 CSE 542: Operating Systems