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swi(9): clean up description of clk_intr_event

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From what I can tell, setdelayed() was removed so long ago that its
mention is more likely to be confusing than helpful. We now have a
manpage for hardclock(9), so reference that.

Reviewed by:	markj
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D36937
This commit is contained in:
Mitchell Horne 2022-10-12 13:35:23 -03:00
parent e23c3445f6
commit 96b76a6a1e
1 changed files with 4 additions and 11 deletions
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15
share/man/man9/swi.9
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@ -139,12 +139,6 @@ Instead,
.Fa handler
will be executed the next time that the software interrupt thread runs after
being scheduled by another event.
Attaching a handler to the clock software interrupt thread and using this flag
when scheduling a software interrupt handler can be used to implement the
functionality performed by
.Fn setdelayed
in earlier versions of
.Fx .
.It Dv SWI_FROMNMI
Specifies that
.Fn swi_sched
@ -163,11 +157,9 @@ clock software interrupts, respectively.
.Va tty_intr_event
is used to hang tty software interrupt handlers off of the same thread.
.Va clk_intr_event
is used to hang delayed handlers off of the clock software interrupt thread so
that the functionality of
.Fn setdelayed
can be obtained in conjunction with
.Dv SWI_DELAY .
is used to hang delayed handlers off of the clock interrupt, and is invoked
directly by
.Xr hardclock 9 .
.Sh RETURN VALUES
The
.Fn swi_add
@ -222,6 +214,7 @@ is
.Dv NULL .
.El
.Sh SEE ALSO
.Xr hardclock 9 ,
.Xr ithread 9 ,
.Xr taskqueue 9
.Sh HISTORY