From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/8529 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: pthread_join stuck in infinite loop Date: Sun, 20 Sep 2015 20:41:36 +0200 Message-ID: <1442774496.24315.5.camel@inria.fr> References: <20150920182936.GC10551@port70.net> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-0Xg7iUh0s05QACDaOWZK" X-Trace: ger.gmane.org 1442774513 17235 80.91.229.3 (20 Sep 2015 18:41:53 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 20 Sep 2015 18:41:53 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-8541-gllmg-musl=m.gmane.org@lists.openwall.com Sun Sep 20 20:41:52 2015 Return-path: Envelope-to: gllmg-musl@m.gmane.org Original-Received: from mother.openwall.net 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Cj15cu23XZI4/826Px/xqB37z547sPH374oOvnKTsOb+1zuCoImZARM8ZiLlKkXcWOcoFRJ+Do/CwFO4e2DEe+9Ti+ZXA8ny/cU+X4bMKRZxZIVEiqXI6/+NKuUzPHb7z40ovnX3zx+Ctuq38HyuqWG7Tu+A0AAAAASUVORK5CYII= X-Mailer: Evolution 3.12.9-1+b1 Xref: news.gmane.org gmane.linux.lib.musl.general:8529 Archived-At: --=-0Xg7iUh0s05QACDaOWZK Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Am Sonntag, den 20.09.2015, 20:29 +0200 schrieb Szabolcs Nagy: > * Julien Ramseier [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. > [...] > 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. Yes, in general this is simply not possible. Otherwise the system would have to keep track of all threads that had been started by the process. The idea of detaching a thread (or starting it detached) is that the system resources that it occupies can be freed as soon as it exits. So just don't make the assumption that you may call join in such a situation. The resources of the thread and the thread ID may even already have been attributed to a new thread that started after the first one has exited. So you are not even sure which thread your id is naming. Jens --=20 :: INRIA Nancy Grand Est ::: Camus ::::::: ICube/ICPS ::: :: ::::::::::::::: office Strasbourg : +33 368854536 :: :: :::::::::::::::::::::: gsm France : +33 651400183 :: :: ::::::::::::::: gsm international : +49 15737185122 :: :: http://icube-icps.unistra.fr/index.php/Jens_Gustedt :: --=-0Xg7iUh0s05QACDaOWZK Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEABECAAYFAlX+/eAACgkQD9PoadrVN+K7SgCggMLKM5ciDqq+ZuJ0KxrI6TcR 6rwAnjnoXEsQ6EKJJJJlXisrioKqPnS4 =hla1 -----END PGP SIGNATURE----- --=-0Xg7iUh0s05QACDaOWZK--