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futex.2: Explain how to get equivalent of FUTEX_WAIT with an absolute timeout 

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2016-06-24 10:20:40 +02:00
parent 678c99868e
commit 4100abc52e
1 changed files with 19 additions and 1 deletions
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20
man2/futex.2
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@ -302,7 +302,6 @@ value change and will not start to sleep.
If the
.I timeout
is not NULL, the structure it points to specifies a
.I relative
timeout for the wait.
(This interval will be rounded up to the system clock granularity,
and is guaranteed not to expire early.)
@ -318,6 +317,25 @@ If
.I timeout
is NULL, the call blocks indefinitely.
.IR Note :
for
.BR FUTEX_WAIT ,
.IR timeout
is interpreted as a
.IR relative
value.
This differs from other futex operations, where
.I timeout
is interpreted as an absolute value.
To obtain the equivalent of
.BR FUTEX_WAIT
with an absolute timeout, employ
.BR FUTEX_WAIT_BITSET
with
.IR val3
specified as
.BR FUTEX_BITSET_MATCH_ANY .
The arguments
.I uaddr2
and