A thread performs disk I/O and blocks. Entire process stops., ULT, KLT, Threads are scheduled directly by the OS, KLT, ULT, True parallelism on multi-core CPU., KLT, ULT, Faster context switching., KLT, ULT, Each thread has its own kernel stack., KLT, ULT, Implemented using thread libraries only., KLT, ULT, If one thread crashes, others continue working., KLT, ULT, Kernel is unaware of threads., KLT, ULT, Requires system call for thread creation., KLT, ULT, Best for simple lightweight applications., KLT, ULT, Blocking affects only one thread., KLT, ULT, No real parallel execution., KLT, ULT.

Kernel-Level Threads and User-Level Threads

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