Linux thread synchronization (4)-spin lock, linux spin

Linux thread synchronization (4)-spin lock, linux spin

The spin lock function is the same as the mutex function. The only difference is that after the mutex is blocked, the system sleep and gives up the cpu. After the spin lock is blocked, the system waits until the lock is obtained !!!

Spin locks are rarely used in the user State and are used in the kernel! Use Cases of spin locks: the lock holding time is short, or less than two context switches.

As with mutex, the spin lock replaces mutex in pthread_mutex_xxx () with spin, for example, pthread_spin_init ().