Date: Wed, 13 Oct 1999 14:41:48 -0600 From: Wes Peters <wes@softweyr.com> To: Patrick Hartling <patrick@137.org> Cc: freebsd-realtime@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG Subject: Re: Comparing pthread_t's in user-level code Message-ID: <3804EE8C.413D3EF2@softweyr.com> References: <19991012203841.B82FE5D99@friley-161-13.res.iastate.edu>
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Patrick Hartling wrote:
>
> I'm working on a project wherein we are putting pthread_t structures into
> a thread manager (a C++ STL map), and we want to be able to maintain the
> structures in an ordered fashion for performance reasons. To do this, we
> need a way to compare the structures. pthread_equal(3) gets us an
> equality comparison, but I cannot find anything for doing a less-than
> comparison. On FreeBSD in particular, the pthread_t structure's contents
> are not accessible to user-level code (as far as I can tell), so that is
> providing some complication. pthread_set_name_np() looks very promising
> since we could use strcmp(3) for doing less-than comparisons, but I cannot
> find any facility for retrieving a thread's name once it is set. I've been
> looking through header files, the libc_r source and the mailing list
> archives but have come up empty thus far. Is there some method to get a
> unique identifer for a pthread_t that can be used for comparison with other
> pthread_t's, or do we have to stick with pthread_equal(3) alone?
A pthread_t is a pointer to a struct pthread. If you don't need any specific
ordering, you could simply sort on the pthread_t itself, treating it as an
unsigned integer value.
--
"Where am I, and what am I doing in this handbasket?"
Wes Peters Softweyr LLC
wes@softweyr.com http://softweyr.com/
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