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Date: Sun, 20 Sep 2015 20:29:36 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: pthread_join stuck in infinite loop
* Julien Ramseier <j.ramseier@...il.com> [2015-09-20 20:07:28 +0200]:
> pthread_join() never returns when calling it on a detached thread.
> I would expect it to return EINVAL instead.
>
"If a thread is detached, its thread ID is invalid for use as an
argument in a call to pthread_detach() or pthread_join()."
http://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_09_02
"The behavior is undefined if the value specified by the thread
argument to pthread_join() does not refer to a joinable thread."
http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_join.html
unfortunately historically ppl believed that detecting detached
state is possible so the rationale for pthread_join still has
"If an implementation detects that the value specified by the
thread argument to pthread_join() does not refer to a joinable
thread, it is recommended that the function should fail and
report an [EINVAL] error."
in particular the glibc man page says EINVAL is correctly
reported in all cases which i dont think is true: there
is a race between the detached thread exiting an join.
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