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rnd(9): Note that rndsource callbacks are never run in hardint. 

But they may be run in softint at IPL_SOFTSERIAL.
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riastradh 2022-05-17 01:39:57 +00:00
parent ba4e9b2ab5
commit d3fd4c2d1e
1 changed files with 12 additions and 1 deletions
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13
share/man/man9/rnd.9
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@ -1,4 +1,4 @@
.\" $NetBSD: rnd.9,v 1.30 2022/03/19 11:54:53 riastradh Exp $
.\" $NetBSD: rnd.9,v 1.31 2022/05/17 01:39:57 riastradh Exp $
.\"
.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -171,6 +171,17 @@ 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.
.Pp
The callback may be invoked in thread context or soft interrupt
context, up to
.Dv SOFTINT_SERIAL ,
and as such must follow the rules of soft interrupt handlers in
.Xr softint 9
\(em that is, the callback must never sleep, except on adaptive
.Xr mutex 9
locks at
.Dv IPL_SOFTSERIAL .
The callback will never be called in hard interrupt context.
.It Fn rnd_attach_source "rnd_source" "devname" "type" "flags"
Makes
.Fa rnd_source