[PATCH 22/24] membarrier.2: Note that glibc does not provide a wrapper

From: Alejandro Colomar
Date: Thu Sep 10 2020 - 17:17:52 EST

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@xxxxxxxxx>
man2/membarrier.2 | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/man2/membarrier.2 b/man2/membarrier.2
index 8825de71e..f65c6be5c 100644
--- a/man2/membarrier.2
+++ b/man2/membarrier.2
@@ -26,9 +26,15 @@
membarrier \- issue memory barriers on a set of threads
.B #include <linux/membarrier.h>
.BI "int membarrier(int " cmd ", int " flags ");"
+.IR Note :
+There is no glibc wrapper for this system call; see NOTES.
.BR membarrier ()
@@ -270,6 +276,9 @@ Examples where
.BR membarrier ()
can be useful include implementations
of Read-Copy-Update libraries and garbage collectors.
+Glibc does not provide a wrapper for this system call; call it using
+.BR syscall (2).
Assuming a multithreaded application where "fast_path()" is executed
very frequently, and where "slow_path()" is executed infrequently, the