get_futex_value_locked

函数名称：get_futex_value_locked

函数原型：static int get_futex_value_locked(unsigned int *dest, unsigned int __user *from)

返回类型：int

参数：

类型	参数	名称
unsigned int *	dest
unsigned int __user *	from

799

These routines enable/disable the pagefault handler. If disabled, it will* not take any locks and go straight to the fixup table.* User access methods will not sleep when called from a pagefault_disabled()* environment.

800

ret等于__get_user - Get a simple variable from user space, with less checking( * dest, from)

801

pagefault_enable()

803

返回:如果ret则负EFAULT否则0

**调用者**
名称	描述
attach_to_pi_state	Validate that the existing waiter has a pi_state and sanity check* the pi_state against the user space value. If correct, attach to* it.
handle_exit_race
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_requeue	ex_requeue() - Requeue waiters from uaddr1 to uaddr2@uaddr1: source futex user address@flags: futex flags (FLAGS_SHARED, etc
fixup_pi_state_owner
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

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