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authorriastradh <riastradh@NetBSD.org>2022-03-19 11:54:53 +0000
committerriastradh <riastradh@NetBSD.org>2022-03-19 11:54:53 +0000
commitb2f23986bc461ea1f2c7b9f45d032fc63b597ba3 (patch)
tree90879debb7a842db2b5aa2454f3d46645da54515
parent799005bc8ad85a3aed9d1b571dfcb215bd5f38de (diff)
rnd(9): Document the serial use of rndsource callbacks.
This simplifies the rndsource API -- no need to lock, unless you're also coordinating with other driver logic like concurrent opencrypto(4) requests that share device requests.
-rw-r--r--share/man/man9/rnd.98
1 files changed, 7 insertions, 1 deletions
diff --git a/share/man/man9/rnd.9 b/share/man/man9/rnd.9
index 32742de987b..225e7eab525 100644
--- a/share/man/man9/rnd.9
+++ b/share/man/man9/rnd.9
@@ -1,4 +1,4 @@
-.\" $NetBSD: rnd.9,v 1.29 2020/05/04 15:13:45 wiz Exp $
+.\" $NetBSD: rnd.9,v 1.30 2022/03/19 11:54:53 riastradh Exp $
.\"
.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
.\" All rights reserved.
@@ -165,6 +165,12 @@ not
or
.Fn rnd_add_uint32 .
.El
+.Pp
+.Nm
+issues calls to each source's
+.Fa callback
+in serial \(em it never issues two calls to the same source's callback
+at the same time in two differen threads or on two different CPUs.
.It Fn rnd_attach_source "rnd_source" "devname" "type" "flags"
Makes
.Fa rnd_source