How does the operating system manage execution threads?

The operating system manages execution threads using a scheduler, which allocates processor time among threads. Each thread is a separate sequence of commands that the OS can suspend and resume.

Key aspects of thread management:

• Creation and destruction: The OS allocates resources for a new thread and releases them after completion.
• Scheduling: The OS decides which thread runs and when, based on priorities and scheduling algorithms.
• Synchronization: The OS provides mechanisms (mutexes, semaphores) for coordinating access to shared resources among threads.
• Context switching: When switching between threads, the OS saves the current thread's state and loads the next thread's state.

In Python, due to GIL (Global Interpreter Lock), only one Python code thread executes at a time, but the OS still manages threads at the system level, allowing I/O operations and multithreading for tasks not related to CPU.