Linux thread Sync (4)-Spin lock

Spin lock and Mutex function, the only one by one points is different is the mutex block after sleep out of the CPU, and the spin lock will notgive up the CPU, will be busy waiting until the lock!!!

Spin lock in the user state use less, in the kernel used more! Spin Lock usage Scenario: Lock holding time is relatively short, or less than 2 times the context switch.

Spin lock in the user-state function interface and mutex, the Pthread_mutex_xxx () in the mutex replaced spin, such as: Pthread_spin_init ().

Linux thread Sync (4)-Spin lock