futex_requeue
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Name

futex_requeue — Requeue waiters from uaddr1 to uaddr2

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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