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futex.2: Note that the CLOCK_MONOTONIC clock is used for relative timeouts 

Verified from inspection of kernel/futex.c::futex_wait().

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2015-01-12 13:47:01 +01:00
parent 1909e523d0
commit 1c952cf53c
1 changed files with 10 additions and 3 deletions
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13
man2/futex.2
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@ -140,8 +140,11 @@ time based on
.BR CLOCK_REALTIME .
If this option is not set,
the kernel treats the user space supplied timeout as relative time.
.\" FIXME a relative time based on what clock?
the kernel treats the user space supplied timeout as relative time,
.\" FIXME I added CLOCK_MONOTONIC here. Is it correct?
measured against the
.BR CLOCK_MONOTONIC
clock.
.PP
The operation specified in
.I op
@ -159,7 +162,11 @@ on this futex address.
If the
.I timeout
argument is non-NULL, its contents specify a relative timeout for the wait.
argument is non-NULL, its contents specify a relative timeout for the wait
.\" FIXME I added CLOCK_MONOTONIC here. Is it correct?
measured according to the
.BR CLOCK_MONOTONIC
clock.
(This interval will be rounded up to the system clock granularity,
and kernel scheduling delays mean that the
blocking interval may overrun by a small amount.)