sbq_wake_ptr

Name:sbq_wake_ptr

Proto:static struct sbq_wait_state *sbq_wake_ptr(struct sbitmap_queue *sbq)

Type:struct sbq_wait_state

Parameter:

Type	Parameter	Name
struct sbitmap_queue *	sbq

492

If Not atomic_read( & @ws_active: count of currently active ws waitqueues) Then Return NULL

495

wake_index = atomic_read( & @wake_index: Next wait queue in @ws to wake up.)

496

When i < SBQ_WAIT_QUEUES cycle

497

ws = @ws: Wait queues.[wake_index]

499

If waitqueue_active -- locklessly test for waiters on the queue*@wq_head: the waitqueue to test for waiters* returns true if the wait list is not empty* NOTE: this function is lockless and requires care, incorrect usage _will_ Then

500

If wake_index != atomic_read( & @wake_index: Next wait queue in @ws to wake up.) Then atomic_set( & @wake_index: Next wait queue in @ws to wake up., wake_index)

502

Return ws

505

wake_index = sbq_index_inc(wake_index)

508

Return NULL

**Caller**
Name	Describe
__sbq_wake_up

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