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[src/trunk]: src/share/man/man9 add a note on IPL and spinning mutexes
details: https://anonhg.NetBSD.org/src/rev/2b9a71914eec
branches: trunk
changeset: 757701:2b9a71914eec
user: ahoka <ahoka%NetBSD.org@localhost>
date: Tue Sep 14 21:35:53 2010 +0000
description:
add a note on IPL and spinning mutexes
TODO: explain when the IPL will be restored
diffstat:
share/man/man9/mutex.9 | 9 +++++++--
1 files changed, 7 insertions(+), 2 deletions(-)
diffs (30 lines):
diff -r 64e970f36caf -r 2b9a71914eec share/man/man9/mutex.9
--- a/share/man/man9/mutex.9 Tue Sep 14 21:34:02 2010 +0000
+++ b/share/man/man9/mutex.9 Tue Sep 14 21:35:53 2010 +0000
@@ -1,4 +1,4 @@
-.\" $NetBSD: mutex.9,v 1.22 2010/02/16 19:21:30 rmind Exp $
+.\" $NetBSD: mutex.9,v 1.23 2010/09/14 21:35:53 ahoka Exp $
.\"
.\" Copyright (c) 2007, 2009 The NetBSD Foundation, Inc.
.\" All rights reserved.
@@ -27,7 +27,7 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
-.Dd February 16, 2010
+.Dd September 14, 2010
.Dt MUTEX 9
.Os
.Sh NAME
@@ -162,6 +162,11 @@
.Pp
Adaptive mutexes and other types of lock that can sleep may
not be acquired while a spin mutex is held by the caller.
+.Pp
+When acquiring a spin mutex, the IPL of the current CPU will be raised to
+the level set in
+.Fn mutex_init
+if it is not already equal or higher.
.It Fn mutex_exit "mtx"
.Pp
Release a mutex.
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