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From: Florian Weimer <fw@deneb.enyo.de>
To: Jonathan Wakely <jwakely@redhat.com>
Cc: "Rich Felker" <dalias@libc.org>, Арсений <a@saur0n.science>,
	musl@lists.openwall.com
Subject: Re: [musl] Mutexes are not unlocking
Date: Mon, 23 Nov 2020 18:18:47 +0100	[thread overview]
Message-ID: <87o8jo3saw.fsf@mid.deneb.enyo.de> (raw)
In-Reply-To: <20201123171016.GV1312820@redhat.com> (Jonathan Wakely's message of "Mon, 23 Nov 2020 17:10:16 +0000")

* Jonathan Wakely:

> Yes. I don't remember why but maybe pthread_key_create exists as a
> stub in glibc's libc.so and so __pthread_key_create is used to
> **really** detect that libpthread.so is linked in.

There's no pthread_key_create in libc.  Roland actually added a
comment why __pthread_key_create is used:

+/* For a program to be multi-threaded the only thing that it certainly must
+   be using is pthread_create.  However, there may be other libraries that
+   intercept pthread_create with their own definitions to wrap pthreads
+   functionality for some purpose.  In those cases, pthread_create being
+   defined might not necessarily mean that libpthread is actually linked
+   in.

I believe the Boehm/Demers/Weiser garbage collector used to be one of
these libraries.

  reply	other threads:[~2020-11-23 17:19 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-20  5:25 a
2020-11-20  5:58 ` Rich Felker
2020-11-21  6:46   ` Re[2]: " a
2020-11-21 15:51     ` Rich Felker
2020-11-22 18:43       ` Re[2]: " Арсений
2020-11-22 19:11         ` Rich Felker
2020-11-22 19:23           ` Florian Weimer
2020-11-22 19:28             ` Rich Felker
2020-11-22 19:45               ` Re[2]: " Арсений
2020-11-22 20:05               ` Арсений
2020-11-23 12:24                 ` Jonathan Wakely
2020-11-23 14:56                   ` Rich Felker
2020-11-23 16:58                     ` Jonathan Wakely
2020-11-23 11:41               ` Jonathan Wakely
2020-11-23 14:53                 ` Rich Felker
2020-11-23 16:19                   ` Jonathan Wakely
2020-11-23 16:51                     ` Rich Felker
2020-11-23 17:10                       ` Jonathan Wakely
2020-11-23 17:18                         ` Florian Weimer [this message]
2020-11-23 16:59                     ` Florian Weimer

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