89 lines
2.9 KiB
Groff
89 lines
2.9 KiB
Groff
.\" Copyright (c) 2003 Alexey Zelkin <phantom@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 12, 2021
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.Dt PTHREAD_SWITCH_ADD_NP 3
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.Os
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.Sh NAME
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.Nm pthread_switch_add_np ,
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.Nm pthread_switch_delete_np
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.Nd thread context switches debugging primitives
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.Sh LIBRARY
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.Lb libpthread
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.Sh SYNOPSIS
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.In pthread_np.h
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.Ft int
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.Fn pthread_switch_add_np "pthread_switch_routine_t routine"
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.Ft int
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.Fn pthread_switch_delete_np "pthread_switch_routine_t routine"
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.Sh DESCRIPTION
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An application is allowed to monitor the thread context switches inside
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the threading library.
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An application can install a routine that gets called every time a thread
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(explicitly created by an application with the
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.Xr pthread_create 3
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function) gets the context switched.
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The routine is passed the thread IDs of the threads that are
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being switched in and out.
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Installation and removal of these hooks may be done using the
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.Fn pthread_switch_add_np
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and
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.Fn pthread_switch_delete_np
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functions respectively.
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.Sh RETURN VALUES
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If successful,
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these functions return 0.
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Otherwise, an error number is returned to indicate the error.
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.Sh ERRORS
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The
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.Fn pthread_switch_add_np
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may fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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.Dv NULL
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pointer was passed in the
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.Fa routine
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argument.
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.El
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.Pp
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The
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.Fn pthread_switch_delete_np
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may fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The
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.Fa routine
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argument is different from the argument previously passed to the
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.Fn pthread_switch_add_np
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function.
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.El
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.Sh SEE ALSO
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.Xr pthread_create 3 ,
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.Xr pthread_np 3
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.Sh AUTHORS
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This manual page was written by
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.An Alexey Zelkin Aq Mt phantom@FreeBSD.org .
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