futex_top_waiter

函数名称：ex_top_waiter() - Return the highest priority waiter on a futex*@hb: the hash bucket the futex_q's reside in*@key: the futex key (to distinguish it from other futex futex_q's)* Must be called with the hb lock held.

函数原型：static struct futex_q *futex_top_waiter(struct futex_hash_bucket *hb, union futex_key *key)

返回类型：struct futex_q

参数：

类型	参数	名称
struct futex_hash_bucket *	hb
union futex_key *	key

**调用者**
名称	描述
lookup_pi_state
futex_lock_pi_atomic	ex_lock_pi_atomic() - Atomic work required to acquire a pi aware futex@uaddr: the pi futex user address@hb: the pi futex hash bucket@key: the futex key associated with uaddr and hb@ps: the pi_state pointer where we store the result of the* lookup
futex_proxy_trylock_atomic	ex_proxy_trylock_atomic() - Attempt an atomic lock for the top waiter@pifutex: the user address of the to futex@hb1: the from futex hash bucket, must be locked by the caller@hb2: the to futex hash bucket, must be locked by the caller@key1: the from
futex_unlock_pi	Userspace attempted a TID -> 0 atomic transition, and failed.* This is the in-kernel slowpath: we look up the PI state (if any),* and do the rt-mutex unlock.

函数逻辑报告