Date: Wed, 13 Oct 1999 16:32:07 -0500 From: Patrick Hartling <patrick@137.org> To: Wes Peters <wes@softweyr.com> Cc: freebsd-realtime@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG Subject: Re: Comparing pthread_t's in user-level code Message-ID: <19991013213207.351A85D71@friley-161-13.res.iastate.edu> In-Reply-To: Message from Wes Peters <wes@softweyr.com> of "Wed, 13 Oct 1999 14:41:48 MDT." <3804EE8C.413D3EF2@softweyr.com>
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Wes Peters <wes@softweyr.com> wrote: } 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. Thanks, I hadn't been able to find the typdef for pthread_t in -current, but it was pointed out to me in -stable (I'm running both but developing primarily in -current). I've tried this, and it is working, so I'm quite happy. Now I have to deal with all the other aspects of the project that aren't porting easily from IRIX. :\ -Patrick Patrick L. Hartling | Research Assistant, VRAC patrick@137.org | Carver Lab - 0095E Black Engineering http://www.137.org/patrick/ | http://www.vrac.iastate.edu/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-realtime" in the body of the message
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