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futex.2: Note the existence of the _PRIVATE constants for 'futex_op' 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2015-01-13 12:25:17 +01:00
parent ff5976814d
commit ae2c1774a2
1 changed files with 15 additions and 0 deletions
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man2/futex.2
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@ -145,6 +145,21 @@ 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.
As a convenience,
.IR <linux/futex.h>
defines a set of constants with the suffix
.BR _PRIVATE
that are equivalents of all of the operations listed below,
.\" except the obsolete FUTEX_FD for which the "private" flag was
.\" meaningless
but with the
.BR FUTEX_PRIVATE_FLAG
ORed into the constant value.
Thus, there are
.BR FUTEX_WAIT_PRIVATE ,
.BR FUTEX_WAKE_PRIVATE ,
and so on.
.TP
.BR FUTEX_CLOCK_REALTIME " (since Linux 2.6.28)"
.\" commit 1acdac104668a0834cfa267de9946fac7764d486