From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/6114 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: [PATCH 1/9] interface additions for the C thread implementation Date: Sun, 07 Sep 2014 13:16:43 +0200 Message-ID: <1410088603.4856.146.camel@eris.loria.fr> References: <20140907002123.GX23797@brightrain.aerifal.cx> <1410081238.4856.137.camel@eris.loria.fr> 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="=-w0Bt1XbUBloQa5Gy7Nrb" X-Trace: ger.gmane.org 1410088613 2710 80.91.229.3 (7 Sep 2014 11:16:53 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 7 Sep 2014 11:16:53 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-6127-gllmg-musl=m.gmane.org@lists.openwall.com Sun Sep 07 13:16:48 2014 Return-path: 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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:6114 Archived-At: --=-w0Bt1XbUBloQa5Gy7Nrb Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable Am Sonntag, den 07.09.2014, 14:05 +0400 schrieb Alexander Monakov: > On Sun, 7 Sep 2014, Jens Gustedt wrote: > > > > For the C++ API/ABI, these also are different types, now, with type= names > > > > (that are used for name mangling, e.g) as listed above. > > > >=20 > > > > Somebody better versed in C++ could perhaps contribute code that > > > > overloads the comparison and assignment operators such that a compi= lation > > > > that tries to compare or copy these types fails. > > >=20 > > > I'm not sure what you meant by this last paragraph. > >=20 > > AFAIR in C++ there are ways to inhibit usage of copy assignment by > > declaring some "operator=3D" function that is never defined. But my C++ > > has really become rusty. >=20 > There's no need to do that since those are unrelated structs, and therefo= re no > operator=3D=3D and operator=3D are available in the first place. You als= o can't do > that in C (but in C++ you get an error rather than a warning when trying > to assign pointers). This is not about assignment between different types and also not for pointers but for the struct themselves. With the current C threads version the following is a priori allowed, but shouldn't: mtx_t a, b; mtx_init(&a, mtx_plain); b =3D a; This "works" in C and in C++. The corresponding code in pthreads would be UB. 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 :: --=-w0Bt1XbUBloQa5Gy7Nrb 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) iEYEABECAAYFAlQMPpsACgkQD9PoadrVN+IRKQCfS2KkGadOuDFHUNgn/D8vARte RHwAn0/WKL7RSCarh6WlJW9dbBTKEHqF =qo/D -----END PGP SIGNATURE----- --=-w0Bt1XbUBloQa5Gy7Nrb--