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futex.2: Document FUTEX_CLOCK_REALTIME 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Thomas Gleixner 2015-01-12 08:34:58 +01:00 committed by Michael Kerrisk
parent fc30eb799b
commit 2e98bbc24a
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@ -125,6 +125,25 @@ with another process.
This allows the kernel to choose the fast path for validating
the user-space address and avoids expensive VMA lookups,
taking reference counts on file backing store, and so on.
.TP
.BR FUTEX_CLOCK_REALTIME " (since Linux 2.6.28)"
.\" commit 1acdac104668a0834cfa267de9946fac7764d486
This option bit can be employed with the
.BR FUTEX_WAIT_BITSET
and
.BR FUTEX_WAIT_REQUEUE_PI
operations (described below).
If this option is set,
the kernel treats the user space supplied timeout as an absolute
time based on
.BR CLOCK_REALTIME .
If this option is not set,
the kernel treats the user space supplied timeout as relative time.
If this is set on any other operation than the supported ones,
the kernel returns ENOSYS!
.PP
The operation specified in
.I op