put_futex_key

函数名称：put_futex_key

函数原型：static inline void put_futex_key(union futex_key *key)

返回类型：void

参数：

类型	参数	名称
union futex_key *	key

736

Drop a reference to the resource addressed by a key.* The hash bucket spinlock must not be held. This is* a no-op for private futexes, see comment in the get* counterpart.

**调用者**
名称	描述
futex_wake	Wake up waiters matching bitset queued on this futex (uaddr).
futex_wake_op	Wake up all waiters hashed on the physical page that is mapped* to this virtual address:
futex_requeue	ex_requeue() - Requeue waiters from uaddr1 to uaddr2@uaddr1: source futex user address@flags: futex flags (FLAGS_SHARED, etc
futex_wait_setup	ex_wait_setup() - Prepare to wait on a futex@uaddr: the futex userspace address@val: the expected value@flags: futex flags (FLAGS_SHARED, etc.)@q: the associated futex_q*@hb: storage for hash_bucket pointer to be returned to caller
futex_lock_pi	Userspace tried a 0 -> TID atomic transition of the futex value* and failed. The kernel side here does the whole locking operation:* if there are waiters then it will block as a consequence of relying* on rt-mutexes, it does PI, etc
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.
futex_wait_requeue_pi	ex_wait_requeue_pi() - Wait on uaddr and take uaddr2@uaddr: the futex we initially wait on (non-pi)@flags: futex flags (FLAGS_SHARED, FLAGS_CLOCKRT, etc

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