SYNOPSIS
- int futex_requeue(u32 __user * uaddr1, unsigned int flags, u32 __user * uaddr2, int nr_wake, int nr_requeue, u32 * cmpval, int requeue_pi);
ARGUMENTS
uaddr1
-
- source futex user address
flags
- futex flags (FLAGS_SHARED, etc.)
uaddr2
- target futex user address
nr_wake
- number of waiters to wake (must be 1 for requeue_pi)
nr_requeue
- number of waiters to requeue (0-INT_MAX)
cmpval
- uaddr1 expected value (or NULL)
requeue_pi
- if we are attempting to requeue from a non-pi futex to a pi futex (pi to pi requeue is not supported)
DESCRIPTION
Requeue waiters on uaddr1 to uaddr2. In the requeue_pi case, try to acquire uaddr2 atomically on behalf of the top waiter.
RETURN
>=0 - on success, the number of tasks requeued or woken; <0 - on error
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