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+.\" $NetBSD: sysmon_taskq.9,v 1.9 2021/12/31 14:22:10 riastradh Exp $
+.\"
+.\" Copyright (c) 2010 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jukka Ruohonen.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd January 24, 2010
+.Dt SYSMON_TASKQ 9
+.Os
+.Sh NAME
+.Nm sysmon_taskq
+.Nd general purpose system monitoring task queue
+.Sh SYNOPSIS
+.In dev/sysmon/sysmon_taskq.h
+.Ft void
+.Fn sysmon_task_queue_preinit "void"
+.Ft void
+.Fn sysmon_task_queue_init "void"
+.Ft void
+.Fn sysmon_task_queue_fini "void"
+.Ft int
+.Fn sysmon_task_queue_sched "u_int pri" "void (*func)(void *)" "void *arg"
+.Ft void
+.Fn sysmon_task_queue_barrier "u_int pri"
+.Sh DESCRIPTION
+The machine-independent
+.Nm
+provides a simple general purpose task queue.
+It can be used to run callbacks that require thread context,
+but do not warrant the use of a more fine-grained solution.
+.Pp
+Although the intended usage is related to the context of system monitoring
+and power management, also other comparable functions are suitable for
+.Nm .
+.Sh FUNCTIONS
+The necessary internal data structures
+are initialized during system startup by
+.Fn sysmon_task_queue_preinit .
+Before actual usage, a machine-dependent
+procedure should finish the initialization
+by calling
+.Fn sysmon_task_queue_init .
+This will create a kernel thread that can be later halted by
+.Fn sysmon_task_queue_fini .
+All scheduled tasks are executed before the queue is halted.
+.Pp
+The
+.Fn sysmon_task_queue_sched
+function enqueues
+.Fa func
+to be executed at the priority
+.Fa pri .
+If
+.Fa pri
+is 0, the scheduled function will be placed as the last element in the queue.
+The single argument passed to
+.Fa func
+is specified by
+.Fa arg .
+.Pp
+The
+.Fn sysmon_task_queue_barrier
+function waits for the completion of all tasks at
+.Fa pri
+or lower currently queued at the time of the call.
+.Sh RETURN VALUES
+Upon successful completion,
+.Fn sysmon_task_queue_sched
+returns 0.
+Otherwise, the following error values are returned:
+.Bl -tag -width [EINVAL]
+.It Bq Er EINVAL
+An invalid parameter was specified.
+.It Bq Er ENOMEM
+There was not enough memory.
+.El
+.Sh SEE ALSO
+.Xr queue 3 ,
+.Xr kthread 9 ,
+.Xr workqueue 9
+.Sh AUTHORS
+.An Jason R. Thorpe Aq Mt thorpej@NetBSD.org