futex_proxy_trylock_atomic

Name: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

Proto:static int futex_proxy_trylock_atomic(unsigned int __user *pifutex, struct futex_hash_bucket *hb1, struct futex_hash_bucket *hb2, union futex_key *key1, union futex_key *key2, struct futex_pi_state **ps, struct task_struct **exiting, int set_waiters)

Type:int

Parameter:

Type	Parameter	Name
unsigned int __user *	pifutex
struct futex_hash_bucket *	hb1
struct futex_hash_bucket *	hb2
union futex_key *	key1
union futex_key *	key2
struct futex_pi_state **	ps
struct task_struct **	exiting
int	set_waiters

1938

struct futex_q * top_waiter = NULL

1942

If get_futex_value_locked( & curval, pifutex) Then Return -EFAULT

1945

If Value for the false possibility is greater at compile time(should_fail_futex(true)) Then Return -EFAULT

1956

top_waiter = 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.

1959

If Not top_waiter Then Return 0

1963

If Not match_futex - Check whether two futex keys are equal*@key1: Pointer to key1*@key2: Pointer to key2* Return 1 if two futex_keys are equal, 0 otherwise. Then Return -EINVAL

1971

vpid = task_pid_vnr(task)

1972

ret = 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

1974

If ret == 1 Then

1975

queue_pi_wake_futex() - Wake a task that acquired the lock during requeue*@q: the futex_q*@key: the key of the requeue target futex*@hb: the hash_bucket of the requeue target futex* During futex_requeue, with requeue_pi=1, it is possible to acquire the

1976

Return vpid

1978

Return ret

**Caller**
Name	Describe
futex_requeue	ex_requeue() - Requeue waiters from uaddr1 to uaddr2@uaddr1: source futex user address@flags: futex flags (FLAGS_SHARED, etc

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