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+.\"     $NetBSD: curproc.9,v 1.7 2023/07/08 13:59:05 riastradh Exp $
+.\"
+.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Gregory McGarry.
+.\"
+.\" 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 July 8, 2023
+.Dt CURPROC 9
+.Os
+.Sh NAME
+.Nm curcpu ,
+.Nm curlwp ,
+.Nm curproc
+.Nd current processor, thread, and process
+.Sh SYNOPSIS
+.In sys/proc.h
+.Ft struct cpu_info *
+.Fn curcpu "void"
+.Vt struct proc *curproc ;
+.Vt struct lwp *curlwp ;
+.In sys/cpu.h
+.Ft bool
+.Fn curcpu_stable "void"
+.Sh DESCRIPTION
+The following retrieve the current CPU, process, and thread
+.Pq lightweight process, or Tn LWP ,
+respectively:
+.Bl -tag -width Dv
+.It Fn curcpu
+Returns a pointer to the
+.Vt "struct cpu_info"
+structure representing the CPU that the code calling it is running on.
+.Pp
+The value of
+.Fn curcpu
+is unstable and may be stale as soon as it is read unless the caller
+prevents preemption by raising the IPL
+.Pq Xr spl 9 , Xr mutex 9 ,
+by disabling preemption
+.Pq Xr kpreempt_disable 9 ,
+or by binding the thread to its CPU
+.Pq Xr curlwp_bind 9 .
+.Pp
+The function
+.Fn curcpu_stable
+can be used in assertions
+.Pq Xr KASSERT 9
+to verify that
+.Fn curcpu
+is stable in the current context.
+.Fn curcpu_stable
+MUST NOT be used to make dynamic decisions about whether to query
+.Fn curcpu .
+.It Dv curproc
+Yields a pointer to the
+.Vt "struct proc"
+structure representing the currently running process.
+.Pp
+The value of
+.Dv curproc
+is stable and does not change during execution except in
+machine-dependent logic to perform context switches, so it works like a
+global constant, not like a stateful procedure.
+.It Dv curlwp
+Yields a pointer to the
+.Vt "struct lwp"
+structure representing the currently running thread.
+.Pp
+The value of
+.Dv curlwp
+is stable and does not change during execution except in
+machine-dependent logic to perform context switches, so it works like a
+global constant, not like a stateful procedure.
+.El
+.Sh SOURCE REFERENCES
+The
+.Fn curcpu
+macro is defined in the machine-independent
+.Pa machine/cpu.h .
+.Pp
+The
+.Dv curproc
+macro is defined in
+.Pa sys/lwp.h .
+.Pp
+The
+.Dv curlwp
+macro has a machine-independent definition in
+.Pa sys/lwp.h ,
+but it may be overridden by
+.Pa machine/cpu.h ,
+and must be overridden on architectures supporting multiprocessing and
+kernel preemption.
+.Pp
+The
+.Fn curcpu_stable
+function is defined in
+.Pa kern/subr_cpu.c .
+.Sh SEE ALSO
+.Xr cpu_number 9 ,
+.Xr proc_find 9