null pthread_t

[Brooks Davis]

I've got some Linux pthread code that goes something like this that I'm
porting to FreeBSD:

------
pthread_t tid;

tid = -1;

/* Do stuff including maybe creating a thread. */

if (tid != -1) {
	pthread_cancel(tid);
	pthread_join(tid, NULL);
}
------

Since FreeBSD uses pointers instead of integers for pthread_t's, this
generates warnings which go away if you replace -1 with NULL, but
it seems like that is likely to do bad things on linux.  Is there a
portable NULL-equivalent pthread_t?  I'm not seeing anything jump out at
me in the headers.

-- Brooks

-- 
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