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Threads, Models, and Issues in Operating Systems Threads are the smallest units of CPU execution within a process. Unlike processes, threads share the same memory space and system resources, making them lightweight and efficient for multitasking. Multithreading improves responsiveness, resource sharing, and parallelism, especially on multi-core systems. Thread Models describe how user-level threads relate to kernel-level threads. In the many-to-one model, multiple user threads map to a single kernel thread, which is simple but lacks true parallelism. The one-to-one model maps each user thread to a kernel thread, enabling parallel execution but with higher overhead. The many-to-many model multiplexes many user threads over a smaller or equal number of kernel threads, balancing efficiency and concurrency. Issues in Multithreading include race conditions, deadlocks, and starvation. Proper synchronization mechanisms such as mutexes, semaphores, and monitors are required to ensure data consistency. Context switching overhead, thread scheduling, and inter-thread communication also affect performance and system stability. Together, threads and their management models play a critical role in modern operating systems by improving efficiency and supporting concurrent execution. #designthinking #snsdesignthinkers #snsinstitutions