From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/5620 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: C11 threads Date: Sat, 26 Jul 2014 13:15:21 +0200 Message-ID: <1406373321.6438.104.camel@eris.loria.fr> References: <20140725104056.GO9928@port70.net> <1406286404.6438.38.camel@eris.loria.fr> <20140725154141.GC4038@brightrain.aerifal.cx> <1406308202.6438.63.camel@eris.loria.fr> <20140725221950.GE4038@brightrain.aerifal.cx> <1406330769.6438.85.camel@eris.loria.fr> <20140726022453.GH4038@brightrain.aerifal.cx> <1406359000.6438.95.camel@eris.loria.fr> <20140726073501.GI4038@brightrain.aerifal.cx> <1406363575.6438.97.camel@eris.loria.fr> <20140726090354.GK4038@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"; 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There are not many places in the > > standard that uses enumeration constants for a similar purpose, and it > > has not much of an advantage. There is the general requirement of the > > standard that all constant integer expressions that it defines must be > > testable by the preprocessor. >=20 > I agree that they're ugly and contrary to style used elsewhere in the > standard, but I don't see how cross-polluting this mess with errno.h > makes it any less offensive. It just makes it easier for implementations to chose a consistent set of values. > > As you can see I strongly disagree here. We shouldn't introduce values > > that semantically serve as error return values of library functions > > and that are not regulated by errno.h and that aren't fixed in > > compilation phase 3. >=20 > Is this just ideological? probably :) > POSIX has plenty of such values, such as the > GAI_*, REG_*, FNM_*, WRDE_*, etc. result codes. Maybe there are not > many (any?) in plain C, but C11 added them and I don't think there's > any use in trying to change it now... POSIX seems to be a little less restrictive than C, here. It uses the term "symbolic constant" where C always uses the term "macro" consistenly all over the place, with threads.h and atomic.h the only exceptions in using enumerations. And C has the explicit requirement that all macros that are defined by the standard to resolve to an "integer constant expression" be such that they can be used in preprocessor directives. > Also C has no precedent for _returning_ error codes (excluding of > course Annex K); the errno.h constants are only used with the errno > object. Exactly, so they got it really bad by having added two optional parts that don't agree on that handling, and that don't even aggree with themselves. (thrd_sleep has yet another convention, -1 for interrupt and other negative value for unspecified "failure", and timespec_get gratuously uses the time base as a return value on success) What a mess. I'll try to come up with a solution that is the least intrusive. 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 :: --=-uPh/tIQK3FxQuvqgNgNK 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) iEYEABECAAYFAlPTjckACgkQD9PoadrVN+LRiQCeKizWDyOhHQzw5DcgVzZFo2VR 3iAAoI1YZbMO+CFttDAEfzSbH9WtHCYu =OuO9 -----END PGP SIGNATURE----- --=-uPh/tIQK3FxQuvqgNgNK--