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+.\" $FreeBSD$
+.\" Copyright (c) 1998 HD Associates, Inc.
+.\" All rights reserved.
+.\"
+.\" 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 AUTHOR 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 AUTHOR 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 Mar 12, 1998
+.Dt SCHED_YIELD 2
+.Os BSD 4
+.Sh NAME
+.Nm sched_yield
+.Nd yield processor
+.Sh SYNOPSIS
+.Fd #include <sched.h>
+.Ft int
+.Fn sched_yield void
+.Sh DESCRIPTION
+The
+.Fn sched_yield
+function forces the running process to relinquish the processor until it
+again becomes the head of its process list.  It takes no arguments.
+.Sh RETURN
+The 
+.Fn sched_yield
+function will return zero if it completes successfully, or it
+will return a value of -1 and set
+.Va errno
+to indicate the error.
+.Sh ERRORS
+On failure
+.Va errno
+will be set to the corresponding value:
+.Bl -tag -width [EFAULT]
+.It Bq Er ENOSYS
+The system is not configured to support this functionality.
+.Sh STANDARDS
+The
+.Fn sched_yield 
+function conforms to
+.St -p1003.1b-93 .