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.\" $FreeBSD: release/9.1.0/share/man/man3/pthread_switch_add_np.3 172880 2007-10-22 10:08:01Z ru $
.\"
.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 libpthread
.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 .