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futex.2: Document FUTEX_UNLOCK_PI 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Thomas Gleixner 2015-01-14 12:24:02 +01:00 committed by Michael Kerrisk
parent 34f14794b5
commit ecae2099c5
1 changed files with 17 additions and 15 deletions
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32
man2/futex.2
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@ -12,20 +12,6 @@
.\" Modified 2004-06-17 mtk
.\" Modified 2004-10-07 aeb, added FUTEX_REQUEUE, FUTEX_CMP_REQUEUE
.\"
.\" 2.6.18 adds (Ingo Molnar) priority inheritance support:
.\" FUTEX_LOCK_PI, FUTEX_UNLOCK_PI, and FUTEX_TRYLOCK_PI. These need
.\" to be documented in the manual page. Probably there is sufficient
.\" material in the kernel source file Documentation/pi-futex.txt.
.\" commit c87e2837be82df479a6bae9f155c43516d2feebc
.\" Author: Ingo Molnar <mingo@elte.hu>
.\" Date: Tue Jun 27 02:54:58 2006 -0700
.\"
.\" commit e2970f2fb6950183a34e8545faa093eb49d186e1
.\" Author: Ingo Molnar <mingo@elte.hu>
.\" Date: Tue Jun 27 02:54:47 2006 -0700
.\"
.\" See Documentation/pi-futex.txt
.\"
.\" 2.6.31 adds FUTEX_WAIT_REQUEUE_PI, FUTEX_CMP_REQUEUE_PI
.\" commit 52400ba946759af28442dee6265c5c0180ac7122
.\" Author: Darren Hart <dvhltc@us.ibm.com>
@ -704,7 +690,23 @@ User space cannot handle this race free.
.BR FUTEX_UNLOCK_PI " (since Linux 2.6.18)"
.\" commit c87e2837be82df479a6bae9f155c43516d2feebc
.\" FIXME to complete
[As yet undocumented]
This operation wakes the top priority waiter which is waiting in
.B FUTEX_LOCK_PI
on the futex address provided by the
.I uaddr
argument.
This is called when the user space value at
.I uaddr
cannot be changed atomically from a TID (of the owner) to 0.
The
.IR uaddr2 ,
.IR val ,
.IR timeout ,
and
.IR val3
are ignored.
.TP
.BR FUTEX_CMP_REQUEUE_PI " (since Linux 2.6.31)"
.\" commit 52400ba946759af28442dee6265c5c0180ac7122