xchg_tail

函数名称：xchg_tail - Put in the new queue tail code word & retrieve previous one*@lock : Pointer to queued spinlock structure*@tail : The new queue tail code word* Return: The previous queue tail code word* xchg(lock, tail), which heads an address dependency*

函数原型：static __always_inline unsigned int xchg_tail(struct qspinlock *lock, unsigned int tail)

返回类型：unsigned int

参数：

类型	参数	名称
struct qspinlock *	lock
unsigned int	tail

181

返回:xchg_relaxed( & tail, tail >> _Q_TAIL_OFFSET)左移_Q_TAIL_OFFSET位

**调用者**
名称	描述
queued_spin_lock_slowpath	queued_spin_lock_slowpath - acquire the queued spinlock@lock: Pointer to queued spinlock structure@val: Current value of the queued spinlock 32-bit word* (queue tail, pending bit, lock value)* fast : slow : unlock* : :* uncontended (0,0,0) -:--> (0,0,1)

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告