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+.\" Copyright (c) 2016 The FreeBSD Foundation
+.\"
+.\" This documentation was written by
+.\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship
+.\" from the FreeBSD Foundation.
+.\"
+.\" 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 AUTHORS 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 AUTHORS 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 May 5, 2020
+.Dt THR_EXIT 2
+.Os
+.Sh NAME
+.Nm thr_exit
+.Nd terminate current thread
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/thr.h
+.Ft void
+.Fn thr_exit "long *state"
+.Sh DESCRIPTION
+.Bf -symbolic
+This function is intended for implementing threading.
+Normal applications should call
+.Xr pthread_exit 3
+instead.
+.Ef
+.Pp
+The
+.Fn thr_exit
+system call terminates the current kernel-scheduled thread.
+.Pp
+If the
+.Fa state
+argument is not
+.Dv NULL ,
+the location pointed to by the argument is
+updated with an arbitrary non-zero value, and an
+.Xr _umtx_op 2
+.Dv UMTX_OP_WAKE
+operation is consequently performed on the location.
+.Pp
+Attempts to terminate the last thread in the process are silently ignored.
+Use
+.Xr _exit 2
+syscall to terminate the process.
+.Sh RETURN VALUES
+The function does not return a value.
+A return from the function indicates that the calling thread was the
+last one in the process.
+.Sh SEE ALSO
+.Xr _exit 2 ,
+.Xr _umtx_op 2 ,
+.Xr thr_kill 2 ,
+.Xr thr_kill2 2 ,
+.Xr thr_new 2 ,
+.Xr thr_self 2 ,
+.Xr thr_set_name 2 ,
+.Xr pthread_exit 3
+.Sh STANDARDS
+The
+.Fn thr_exit
+system call is non-standard and is used by
+.Lb libthr
+to implement
+.St -p1003.1-2001
+.Xr pthread 3
+functionality.
+.Sh HISTORY
+The
+.Fn thr_exit
+system call first appeared in
+.Fx 5.2 .