CPython

Following Java platform and virtual threads, Go G-M-P, and CPython threads from their runtime representations to OS threads and ultimately CPU execution.

Traces the actual implementation paths of Java synchronized, Go sync.Mutex, and CPython threading.Lock to show how mutexes rely on atomic operations, memory ordering, and waiting and wake-up mechanisms.

Traces the implementation paths of Java AtomicInteger, Go sync/atomic, and CPython's internal atomic operations to show how atomic RMW, CAS, and memory ordering reach the CPU.