From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/9091 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: atomic.h cleanup Date: Mon, 11 Jan 2016 18:12:29 +0100 Message-ID: <1452532349.28095.10.camel@inria.fr> References: <20160110122139.GF2016@debian> <20160110165718.GR238@brightrain.aerifal.cx> <20160110173509.GG2016@debian> <20160111163544.GI2016@debian> 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="=-pt7+s/dP4A+/QVfQbA2A" X-Trace: ger.gmane.org 1452532368 14401 80.91.229.3 (11 Jan 2016 17:12:48 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 11 Jan 2016 17:12:48 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-9104-gllmg-musl=m.gmane.org@lists.openwall.com Mon Jan 11 18:12:44 2016 Return-path: 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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:9091 Archived-At: --=-pt7+s/dP4A+/QVfQbA2A Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello, Am Montag, den 11.01.2016, 17:35 +0100 schrieb Markus Wichmann: > Really? OK, so it's either suboptimal code for everyone or > compiler-specific better code. Why can't we have nice things? nice things would be portable atomics, no? > OTOH, maybe we simply shouldn't write synchronisation primitives > ourselves and instead use the ones provided by GCC (and let other > compilers suck on a salty sausage, if they don't support those > primitives). I think on the long run we should use C11 atomics and leave the dirty work to the compiler writers. To my experience they do good work with that now, the assembler they produce looks nice. My stdatomic library is sitting there, ready to integrate into musl. It solves the problem of backwards compatibility for all compilers that that implement the __sync builtins. (gcc and clang with very old version numbers.) Last time I looked, all usages but one of atomic operations in musl are clean. If an atomic operation is used for a data a some point, atomic operations are used in all other places. So moving to _Atomic(int) would be a option. (Basically this would be `volatile int*` =3D> `_Atomic(int)`, IIRC). 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 :: --=-pt7+s/dP4A+/QVfQbA2A 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 iEYEABECAAYFAlaT4n0ACgkQD9PoadrVN+J8YQCfdopa/+aCNo/aovfQlddIgqFm qIYAnR4gZqOLZgw/2Uvx8CXOjT8SBSpI =pMaL -----END PGP SIGNATURE----- --=-pt7+s/dP4A+/QVfQbA2A--