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From: Jung-uk Kim <jkim@FreeBSD.org>
To: Garrett Cooper <gcooper@FreeBSD.org>
Date: Mon, 7 Feb 2011 18:28:58 -0500
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Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org,
	src-committers@FreeBSD.org
Subject: Re: svn commit: r218414 - in head: include lib/libc/include
	lib/libthr lib/libthr/thread share/man/man3 sys/sys
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On Monday 07 February 2011 06:12 pm, Garrett Cooper wrote:
> On Mon, Feb 7, 2011 at 1:26 PM, Jung-uk Kim <jkim@freebsd.org> 
wrote:
> > Author: jkim
> > Date: Mon Feb �7 21:26:46 2011
> > New Revision: 218414
> > URL: http://svn.freebsd.org/changeset/base/218414
> >
> > Log:
> > �Introduce a non-portable function pthread_getthreadid_np(3) to
> > retrieve �calling thread's unique integral ID, which is similar
> > to AIX function of �the same name. �Bump __FreeBSD_version to
> > note its introduction.
>
>     Stupid question: how is this different from pthread_self() ?
> Isn't the pthread_t value returned unique across the system, or is
> it relative to the process somehow?

pthread_self(3) returns an opaque type pthread_t, e.g., 
pthread_equal(3) must be used to compare two thread IDs.  
pthread_getthreadid_np(3) returns an integral type int, which is 
actually td_tid of the calling thread for libthr(3).

Please see the following discussion:

http://docs.freebsd.org/cgi/mid.cgi?201102071558.03573.jkim

Jung-uk Kim