From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/5763 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: Explaining cond var destroy [Re: [musl] C threads, v3.0] Date: Thu, 07 Aug 2014 00:43:35 +0200 Message-ID: <1407365015.24324.334.camel@eris.loria.fr> References: <1407144603.8274.248.camel@eris.loria.fr> <20140806035213.GR1674@brightrain.aerifal.cx> <1407314595.24324.277.camel@eris.loria.fr> <1407318064.24324.282.camel@eris.loria.fr> <20140806100335.GV1674@brightrain.aerifal.cx> <1407321172.24324.287.camel@eris.loria.fr> <20140806161552.GB1674@brightrain.aerifal.cx> <1407344216.24324.317.camel@eris.loria.fr> <20140806173254.GC1674@brightrain.aerifal.cx> <1407358510.24324.328.camel@eris.loria.fr> <20140806220453.GD1674@brightrain.aerifal.cx> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/signed; micalg="pgp-sha1"; 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C3d0WolfKhTp6clRyhcg04xtGCHt1Dh/rExRamYWGyxXa7xn1yYuvkAwP7fClg0Zhx+qr/rM7d+Yesc73nHD5OW7Zh478tRzPxACH/iRa245duzkAdsJfMuy8aXm/FUFlpeWWOm2WZidI9WapaUlFIaTlQ4jfR6/vO9D2NE32LTeYnZOUmnA6PAohx9+qnTy1NnrP/ Cj15cu23XZI4/826Px/xqB37z547sPH374oOvnKTsOb+1zuCoImZARM8ZiLlKkXcWOcoFRJ+Do/CwFO4e2DEe+9Ti+ZXA8ny/cU+X4bMKRZxZIVEiqXI6/+NKuUzPHb7z40ovnX3zx+Ctuq38HyuqWG7Tu+A0AAAAASUVORK5CYII= X-Mailer: Evolution 3.4.4-3 Xref: news.gmane.org gmane.linux.lib.musl.general:5763 Archived-At: --=-HyeQtVaKbDts+xHmDj5q Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable Am Mittwoch, den 06.08.2014, 18:04 -0400 schrieb Rich Felker: > No. The problem is that the memory in which the cond var resides could > previously have been used for a mutex, semaphore, or other object for > which a futex wait arrives "very late" due to scheduling. It has > nothing to do with the destruction of cond vars. Hm, but then we have a problem on the side that has this late wait, that is an access to a dead object. So the UB is there, in that thread that is doing the wait. (Suppose it is just threads and not processes, that would even be more complicated.) That spurious wakeup that you are talking about is a consequence of UB. good night Jens --=20 :: INRIA Nancy Grand Est ::: AlGorille ::: ICube/ICPS ::: :: ::::::::::::::: office Strasbourg : +33 368854536 :: :: :::::::::::::::::::::: gsm France : +33 651400183 :: :: ::::::::::::::: gsm international : +49 15737185122 :: :: http://icube-icps.unistra.fr/index.php/Jens_Gustedt :: --=-HyeQtVaKbDts+xHmDj5q 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 v1.4.12 (GNU/Linux) iEYEABECAAYFAlPir5cACgkQD9PoadrVN+JJDgCffwspUA4q+nqNTN0PAMv8Zbmz 32EAn27+5VqN4szbcdyV1+rGdRHUeJ/g =C5to -----END PGP SIGNATURE----- --=-HyeQtVaKbDts+xHmDj5q--