多核操作系统自旋锁技术研究

多核操作系统通常采用自旋锁技术保证多核之间互斥.处理器核属于硬件设备,需要硬件锁机制实现核间互斥,各类处理器都提供相应的硬件指令实现自旋锁,如锁总线.处理器核在获取自旋不成功时,一直自旋,直到获取锁成功.自旋锁持有时间非常短,不引起睡眠,效率很高.

Research on Spin Lock of Multi-processor Operating System

The spin lock is used on multi-processor operating system for mutex between processors .The processor is hardware device ,the mutex between devices needs hardware support .As known ,most proces-sor provide some instructions for the implement of spin lock , such as bus lock .The processor will loop check the lock state until the lock free when the lock is held by other processor .As the duration of hold spin lock is very short and the caller will not be blocked ,so the spin lock is very effective.