[haiku-development] Re: Calling pthread_join on a detached pthread
- From: Jason Whitehorn <jason.whitehorn@xxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Sun, 5 Aug 2012 09:21:36 -0500
On Sun, Aug 5, 2012 at 8:54 AM, Rene Gollent <anevilyak@xxxxxxxxx> wrote:
>
>
> When pthread_detach() is called, the thread structure associated with
> it is freed. As such, if you then call pthread_join() on the same
> structure, you're asking the latter to operate on already freed
> memory, hence the crash.
>
> Regards,
>
> Rene
>
>
Thank you for your reply.
That is my understanding as well, that the free in `join` is trying to
release an object was was previously freed.
I guess my confusion was that I was going off of an old POSIX document that
lead me to believe that pthread_join should safe guard against this
condition by returning EINVAL, as opposed to crashing.
I now see that I was going against an outdated document.
I guess this conversation ties into ticket #61 (
https://dev.haiku-os.org/ticket/61), which discusses building a POSIX test
suite.
The test suite I was using was the one from
http://sourceforge.net/projects/posixtest/, and it raises this condition of
calling pthread_join on a detached thread to see what the underlying OS
does. The patch I submitted prevented the crash, and resulted in this
particular test case to pass.
Perhaps this test suite is outdated as well... that is part of what I am
trying to understand.
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