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-.\" Copyright (c) 2003 Alexey Zelkin <phantom@FreeBSD.org>
-.\" 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.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd February 13, 2003
-.Dt PTHREAD_SWITCH_ADD_NP 3
-.Os
-.Sh NAME
-.Nm pthread_switch_add_np ,
-.Nm pthread_switch_delete_np
-.Nd thread context switches debugging primitives
-.Sh LIBRARY
-.Lb libc_r
-.Sh SYNOPSIS
-.In pthread_np.h
-.Ft int
-.Fn pthread_switch_add_np "pthread_switch_routine_t routine"
-.Ft int
-.Fn pthread_switch_delete_np "pthread_switch_routine_t routine"
-.Sh DESCRIPTION
-An application is allowed to monitor the thread context switches inside
-the threading library.
-An application can install a routine that gets called every time a thread
-(explicitly created by an application with the
-.Xr pthread_create 3
-function) gets the context switched.
-The routine is passed the thread IDs of the threads that are
-being switched in and out.
-Installation and removal of these hooks may be done using the
-.Fn pthread_switch_add_np
-and
-.Fn pthread_switch_delete_np
-functions respectively.
-.Sh RETURN VALUES
-If successful,
-these functions return 0. 
-Otherwise, an error number is returned to indicate the error.
-.Sh ERRORS
-The
-.Fn pthread_switch_add_np
-may fail if:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-.Dv NULL
-pointer was passed in the
-.Fa routine
-argument.
-.El
-.Pp
-The
-.Fn pthread_switch_delete_np
-may fail if:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The
-.Fa routine
-argument is different from the argument previously passed to the
-.Fn pthread_switch_add_np
-function.
-.El
-.Sh SEE ALSO
-.Xr pthread_create 3
-.Sh AUTHORS
-This manual page was written by
-.An Alexey Zelkin Aq phantom@FreeBSD.org .