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-.\" Copyright (c) 2016 The FreeBSD Foundation, Inc.
-.\" All rights reserved.
-.\"
-.\" 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.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd May 5, 2020
-.Dt THR_SUSPEND 2
-.Os
-.Sh NAME
-.Nm thr_suspend
-.Nd suspend the calling thread
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/thr.h
-.Ft int
-.Fn thr_suspend "struct timespec *timeout"
-.Sh DESCRIPTION
-.Bf -symbolic
-This function is intended for implementing threading.
-Normal applications should use
-.Xr pthread_cond_timedwait 3
-together with
-.Xr pthread_cond_broadcast 3
-for typical safe suspension with cooperation of the thread
-being suspended, or
-.Xr pthread_suspend_np 3
-and
-.Xr pthread_resume_np 3
-in some specific situations, instead.
-.Ef
-.Pp
-The
-.Fn thr_suspend
-system call puts the calling thread in a suspended state, where it is
-not eligible for CPU time.
-This state is exited by another thread calling
-.Xr thr_wake 2 ,
-when the time interval specified by
-.Fa timeout
-has elapsed,
-or by the delivery of a signal to the suspended thread.
-.Pp
-If the
-.Fa timeout
-argument is
-.Dv NULL ,
-the suspended state can be only terminated by explicit
-.Fn thr_wake
-or signal.
-.Pp
-If a wake from
-.Xr thr_wake 2
-was delivered before the
-.Nm
-call, the thread is not put into a suspended state.
-Instead, the call
-returns immediately without an error.
-.Pp
-If a thread previously called
-.Xr thr_wake 2
-with its own thread identifier, which resulted in setting the internal kernel
-flag to immediately abort interruptible sleeps with an
-.Er EINTR
-error
-.Po
-see
-.Xr thr_wake 2
-.Pc ,
-the flag is cleared.
-As with
-.Xr thr_wake 2
-called from another thread, the next
-.Nm
-call does not result in suspension.
-.Sh RETURN VALUES
-.Rv -std thr_suspend
-.Sh ERRORS
-The
-.Fn thr_suspend
-operation returns the following errors:
-.Bl -tag -width Er
-.It Bq Er EFAULT
-The memory pointed to by the
-.Fa timeout
-argument is not valid.
-.It Bq Er ETIMEDOUT
-The specified timeout expired.
-.It Bq Er ETIMEDOUT
-The
-.Fa timeout
-argument specified a zero time interval.
-.It Bq Er EINTR
-The sleep was interrupted by a signal.
-.El
-.Sh SEE ALSO
-.Xr ps 1 ,
-.Xr thr_wake 2 ,
-.Xr pthread_resume_np 3 ,
-.Xr pthread_suspend_np 3
-.Sh STANDARDS
-The
-.Fn thr_suspend
-system call is non-standard.
-.Sh HISTORY
-The
-.Fn thr_suspend
-system call first appeared in
-.Fx 5.2 .