other versions
- stretch 4.9.168-1
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 requeueSYNOPSIS¶
void requeue_pi_wake_futex(struct futex_q * q, union futex_key * key, struct futex_hash_bucket * hb);
ARGUMENTS¶
qthe 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¶
April 2019 | Kernel Hackers Manual 4.9. |