requeue_pi_wake_futex man page on OpenSuSE

requeue_pi_wake_futex man page on OpenSuSE

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REQUEUE_PI_WAKE_FUTE(9)	      Futex API reference      REQUEUE_PI_WAKE_FUTE(9)

NAME
       requeue_pi_wake_futex - Wake a task that acquired the lock during
       requeue

SYNOPSIS
       void requeue_pi_wake_futex(struct futex_q * q, union futex_key * key,
				  struct futex_hash_bucket * hb);

ARGUMENTS
       q
	   the futex_q

       key
	   the key of the requeue target futex

       hb
	   the hash_bucket of the requeue target futex

DESCRIPTION
       During futex_requeue, with requeue_pi=1, it is possible to acquire the
       target futex if it is uncontended or via a lock steal. Set the futex_q
       key to the requeue target futex so the waiter can detect the wakeup on
       the right futex, but remove it from the hb and NULL the rt_waiter so it
       can detect atomic lock acquisition. Set the q->lock_ptr to the requeue
       target hb->lock to protect access to the pi_state to fixup the owner
       later. Must be called with both q->lock_ptr and hb->lock held.

AUTHOR
       Rusty Russell <rusty@rustcorp.com.au>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.11	 November 2013	       REQUEUE_PI_WAKE_FUTE(9)

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