membarrier.2: Note that glibc does not provide a wrapper

Notes: I copied .nf and .fi from futex.2, but they made no visual difference.
What do they actually do?

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

diff --git a/man2/membarrier.2 b/man2/membarrier.2
index 8825de71e540e82c610f0e422ff9ccf309a86ceb..f65c6be5caeb75eea20946bf4920ac034a7ae248 100644 (file)
--- a/man2/membarrier.2
+++ b/man2/membarrier.2
@@ -26,9 +26,15 @@
 .SH NAME
 membarrier \- issue memory barriers on a set of threads
 .SH SYNOPSIS
+.nf
+.PP
 .B #include <linux/membarrier.h>
 .PP
 .BI "int membarrier(int " cmd ", int " flags ");"
+.fi
+.PP
+.IR Note :
+There is no glibc wrapper for this system call; see NOTES.
 .SH DESCRIPTION
 The
 .BR membarrier ()
@@ -270,6 +276,9 @@ Examples where
 .BR membarrier ()
 can be useful include implementations
 of Read-Copy-Update libraries and garbage collectors.
+.PP
+Glibc does not provide a wrapper for this system call; call it using
+.BR syscall (2).
 .SH EXAMPLES
 Assuming a multithreaded application where "fast_path()" is executed
 very frequently, and where "slow_path()" is executed infrequently, the