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From: Jung-uk Kim <jkim@FreeBSD.org>
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Date: Fri, 4 Feb 2011 15:25:56 -0500
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Cc: davidxu@FreeBSD.org
Subject: Re: [RFC] Implement pthread_getthreadid_np(3) and
	pthread_getunique_np(3)
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On Friday 04 February 2011 02:09 pm, Jung-uk Kim wrote:
> Our pthread_t is not an integral type and it causes a lot of
> trouble porting some software, which relies on Linux's gettid() or
> similar syscalls:
>
> http://www.kernel.org/doc/man-pages/online/pages/man2/gettid.2.html
>
> For example:
>
> http://docs.freebsd.org/cgi/mid.cgi?201102032111.13479.jkim
>
> To solve this problem, I implemented two functions:
>
> http://people.freebsd.org/~jkim/thr_tid.diff

BTW, you can easily emulate semantic of Linux's gettid() with it:

#include <pthread_np.h>
#include <sys/types.h>
#include <unistd.h>

pid_t
gettid(void)
{

	if (pthread_main_np() == 0)
		return (pthread_getthreadid_np());
	return (getpid());
}

Jung-uk Kim