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futex.2: Document FUTEX_PRIVATE_FLAG 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Thomas Gleixner 2015-01-12 08:23:53 +01:00 committed by Michael Kerrisk
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@ -113,6 +113,18 @@ argument consists of two parts:
a command that specifies the operation to be performed,
bit-wise ORed with zero or or more options that
modify the behaviour of the operation.
The options that may be included in
.I op
are as follows:
.TP
.BR FUTEX_PRIVATE_FLAG " (since Linux 2.6.22)"
.\" commit 34f01cc1f512fa783302982776895c73714ebbc2
This option bit can be employed with all futex operations.
It tells the kernel that the futex is process private and not shared
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.
.PP
The operation specified in
.I op