Man page 9 : abort_exclusive_wait

abort_exclusive_wait - abort exclusive waiting in a queue

void abort_exclusive_wait(wait_queue_head_t *  q , wait_queue_t *  wait , unsigned int  mode , void *  key );

q
    waitqueue waited on

wait
    wait descriptor

mode
    runstate of the waiter to be woken

key
    key to identify a wait bit queue or NULL

Sets current thread back to running state and removes the wait descriptor from the given waitqueue if still queued.

Wakes up the next waiter if the caller is concurrently woken up through the queue.

This prevents waiter starvation where an exclusive waiter aborts and is woken up concurrently and no one wakes up the next waiter.