From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/6741 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: Fixing multithreaded set*id() AS-safety Date: Sat, 20 Dec 2014 09:48:16 +0100 Message-ID: <1419065296.29611.1.camel@inria.fr> References: <20141220033918.GA3273@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"; protocol="application/pgp-signature"; boundary="=-26K11wNQJ6VA7FzJ/nJH" X-Trace: ger.gmane.org 1419065318 16984 80.91.229.3 (20 Dec 2014 08:48:38 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 20 Dec 2014 08:48:38 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-6754-gllmg-musl=m.gmane.org@lists.openwall.com Sat Dec 20 09:48:32 2014 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 Xref: news.gmane.org gmane.linux.lib.musl.general:6741 Archived-At: --=-26K11wNQJ6VA7FzJ/nJH Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello Am Freitag, den 19.12.2014, 22:39 -0500 schrieb Rich Felker: > Neither approach is really attractive. Strategy 1 feels less hackish > and more elegant (it actually makes the pthread_create code more > elegant than it is now by having fewer special cases), but the cost > feels wasteful. Strategy 2 is ugly but has the ugliness isolated to > synccall.c (the internals for set*id()) where it doesn't interact with > other parts of the code in any significant way. >=20 > Any opinions on which way we should go? I'll probably hold off to do > any of this until the next release cycle (or maybe even later), but I > want to go ahead and start thinking about and discussing it. I am much more in favor of version 2 or something equivalent, because it keeps the complexity where it belongs. As our implementation is currently, all changes to pthread_create would equally impact thrd_create. C threads are an interface that knows nothing about unistd.h and that is mean to be simple and efficient. A program that builds entirely on C11 features to be portable will never use any of these, so the impact of weird border cases from POSIX should be minimal, wherever we can avoid it. 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 :: --=-26K11wNQJ6VA7FzJ/nJH 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 iEYEABECAAYFAlSVN9EACgkQD9PoadrVN+LwSwCaAgP/VGRyKsB8LZRps5S5VdKB wzQAnAw35ghHtftEUQ301uR5h/dvjX36 =VhCi -----END PGP SIGNATURE----- --=-26K11wNQJ6VA7FzJ/nJH--