Spinlock

Spinlock 的协作图:

结构体
struct	Spinlock

宏定义
#define	SPIN_LOCK_INIT(lock)   SPIN_LOCK_S lock = SPIN_LOCK_INITIALIZER(lock)

详细描述

宏定义说明

SPIN_LOCK_INIT

#define SPIN_LOCK_INIT

(

lock

)

SPIN_LOCK_S lock = SPIN_LOCK_INITIALIZER(lock)

• This macro is used to define the input parameter lock as a spinlock, and initialize the spinlock statically.
• This macro has no return value.
• Note that the input parameter lock does not need to be defined before calling this macro. Otherwise, the variable lock is repeatedly defined.
• On Non-SMP (UP) mode, this macro has no effect.
• The spinlock is advised to protect operation that take a short time. Otherwise, the overall system performance may be affected because the thread exits the waiting loop only after the spinlock is obtained. For time-consuming operation, the mutex lock can be used instead of spinlock.