| futex_wait_setup(9) - phpMan
FUTEX_WAIT_SETUP(9) Futex API reference FUTEX_WAIT_SETUP(9)
NAME
futex_wait_setup - Prepare to wait on a futex
SYNOPSIS
int futex_wait_setup(u32 __user * uaddr, u32 val, unsigned int flags, struct futex_q * q,
struct futex_hash_bucket ** hb);
ARGUMENTS
uaddr
the futex userspace address
val
the expected value
flags
futex flags (FLAGS_SHARED, etc.)
q
the associated futex_q
hb
storage for hash_bucket pointer to be returned to caller
DESCRIPTION
Setup the futex_q and locate the hash_bucket. Get the futex value and compare it with the
expected value. Handle atomic faults internally. Return with the hb lock held and a q.key
reference on success, and unlocked with no q.key reference on failure.
RETURN
0 - uaddr contains val and hb has been locked; <1 - -EFAULT or -EWOULDBLOCK (uaddr does
not contain val) and hb is unlocked
AUTHOR
Rusty Russell <rusty AT rustcorp.au>
Author.
COPYRIGHT
Kernel Hackers Manual 4.8. January 2017 FUTEX_WAIT_SETUP(9)
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