From: Jens Gustedt <jens.gustedt@inria.fr>
To: <Salman.Ahmed@weidmueller.com>
Cc: musl@lists.openwall.com
Subject: Re: segmentation fault on pthread_detach
Date: Tue, 27 Mar 2018 14:32:55 +0200 [thread overview]
Message-ID: <20180327143255.67c8b2c5@inria.fr> (raw)
In-Reply-To: <E9B8FCA610BB6249B7C397BE4A01AE19412212@SRVDE355.weidmueller.com>
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Hello Salman,
On Tue, 27 Mar 2018 12:00:39 +0000 <Salman.Ahmed@weidmueller.com> wrote:
> My application using musl libc runs into a seg fault if I call
> pthread_detach after pthread_join on the same thread. From my
> understanding pthread_detach should return ESRCH if a previous join
> was called on a particular thread. That’s the correct behavior I see
> if I run my program with glibc. But on my LEDE based router I run
> into the seg fault issue. The cross compiling toolchain I use is
> arm_cortex-a9+neon_gcc-5.4.0_musl-1.1.16_eabi. Simple example I used
> for testing is below.
I don't think that your expectation is correct. The POSIX standard
states:
> The behavior is undefined if the value specified by the thread argument
> to pthread_detach() does not refer to a joinable thread.
(a thread that has already been joined is not joinable)
This is for good reasons. The system must be able to dispose of all
resources that a thread occupied after it has been joined. The memory
will be reused, in particular there may be a new thread that uses the
same identifier.
Jens
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next prev parent reply other threads:[~2018-03-27 12:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-27 12:00 Salman.Ahmed
2018-03-27 12:32 ` Jens Gustedt [this message]
2018-03-27 12:51 ` AW: " Salman.Ahmed
2018-03-27 13:00 ` Szabolcs Nagy
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