From owner-freebsd-hackers@FreeBSD.ORG  Wed Feb  7 22:45:52 2007
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Date: Wed, 7 Feb 2007 17:45:51 -0500 (EST)
From: Daniel Eischen <deischen@freebsd.org>
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To: youshi10@u.washington.edu
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Cc: freebsd-hackers@freebsd.org
Subject: Re: Trying to join an already exited pthread
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On Wed, 7 Feb 2007, youshi10@u.washington.edu wrote:

> On Wed, 7 Feb 2007, Pietro Cerutti wrote:
>
>> On 2/7/07, youshi10@u.washington.edu <youshi10@u.washington.edu> wrote:
>>> Just wondering:
>>> 
>>> If I was to try and join a pthread that already exited, would there be an 
>>> error message output and/or errno set to an error value, or would a system 
>>> hang?
>> 
>> man pthread_join(3):
>> 
>> ERRORS
>>    The pthread_join() function will fail if:
>>    [EINVAL]           The implementation has detected that the value speci-
>>                       fied by thread does not refer to a joinable thread.
>> 
>> A pthread that already exited is considered non-joinable

That is not true.  A thread is joinable if it has not yet
detached.  A thread can exit without detaching.  See the
POSIX spec at

   http://www.opengroup.org/onlinepubs/009695399/toc.htm

for more info.

-- 
DE