freebsd-dev/share/man/man3/pthread_switch_add_np.3

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.\" Copyright (c) 2003 Alexey Zelkin <phantom@FreeBSD.org>
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.Dd February 13, 2003
.Dt PTHREAD_SWITCH_ADD_NP 3
.Os
.Sh NAME
.Nm pthread_switch_add_np ,
.Nm pthread_switch_delete_np
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.Nd thread context switches debugging primitives
.Sh LIBRARY
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.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
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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.
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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,
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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
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.Dv NULL
pointer was passed in the
.Fa routine
argument.
.El
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.Pp
The
.Fn pthread_switch_delete_np
may fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
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The
.Fa routine
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argument is different from the argument previously passed to the
.Fn pthread_switch_add_np
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function.
.El
.Sh SEE ALSO
.Xr pthread_create 3
.Sh AUTHORS
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This manual page was written by
.An Alexey Zelkin Aq phantom@FreeBSD.org .