freebsd-nq/share/man/man3/pthread_set_name_np.3
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from the synopses of pthread*(3) manpages.

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.\" Copyright (c) 2003 Alexey Zelkin <phantom@FreeBSD.org>
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.Dd February 13, 2003
.Dt PTHREAD_SET_NAME_NP 3
.Os
.Sh NAME
.Nm pthread_set_name_np
.Nd set the thread name
.Sh LIBRARY
.Lb libpthread
.Sh SYNOPSIS
.In pthread_np.h
.Ft void
.Fn pthread_set_name_np "pthread_t tid" "const char *name"
.Sh DESCRIPTION
The
.Fn pthread_set_name_np
function sets internal name for thread specified by
.Fa tid
argument to string value specified by
.Fa name
argument.
.Pp
This is a debugging interface and using it on a day-by-day basis makes
no sense.
.Sh ERRORS
Because of the debugging nature of this function, all errors that may
appear inside are silently ignored.
.Sh AUTHORS
This manual page was written by
.An Alexey Zelkin Aq phantom@FreeBSD.org .