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Module 2: Processes & Scheduling

20235m

Explain user and kernel level threads in detail.

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User & Kernel Threads

ULT: implemented via thread library (pthreads user-level), TCB in user space, scheduling by library, no kernel trap for switch, cannot exploit multiprocessors, whole process blocks on I/O.
KLT: kernel maintains TCB, scheduling by kernel, can be scheduled on different cores, system calls handle ops. Needs mode switch but supports parallel execution. Modern OS supports hybrid.

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