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| From | Tim Rentsch <txr@alumni.caltech.edu> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: things i would ban from clc |
| Date | 2012-03-14 14:06 -0700 |
| Organization | A noiseless patient Spider |
| Message-ID | <kfnsjhalwow.fsf@x-alumni2.alumni.caltech.edu> (permalink) |
| References | (10 earlier) <jjn07n$rv2$1@speranza.aioe.org> <lnsjhcd5cj.fsf@nuthaus.mib.org> <jjo1lk$jrm$1@speranza.aioe.org> <kfn62e8m6n3.fsf@x-alumni2.alumni.caltech.edu> <4f60454f$0$1385$4fafbaef@reader2.news.tin.it> |
"io_x" <a@b.c.invalid> writes: > "Tim Rentsch" <txr@alumni.caltech.edu> ha scritto nel messaggio >[snip] >> Even though it is optional, support for threading is not just >> another library, and that is important - for threads to work, the >> language definition needs to be augmented so that the semantics >> of inter-thread operations is well-defined. Furthermore the >> visible language (as opposed to library) for C was itself changed >> to accommodate threads, eg, '_Thread_local' storage class >> specifier. > > where is the wrong on this below? where are difficulties? > there is one u32 space for the struct that > is used from OS for the thread signals > > for example: > // global to all threads > #define u8 unsigned char > #define u32 unsigned > > u8 *thisIsAList; > List(&thisIsAList); // create the list memory, and inizilize > if(thisIsAList==0) return "this is one errror"; > > // local thread > Lock(thisIsAList); > // for example the first u32 of the list, point to the memory > // the OS use for block, for multhread > Operations(thisIsAList); > UnLock(thisIsAList); Here is a reference for a paper that explores the issues. Threads Cannot be Implemented as a Library Boehm, Hans-J. HPL-2004-209 Abstract: In many environments, multi-threaded code is written in a language that was originally designed without thread support (e.g. C), to which a library of threading primitives was subsequently added. There appears to be a general understanding that this is not the right approach. We provide specific arguments that a pure library approach, in which the compiler is designed independently of threading issues, cannot guarantee correctness of the resulting code. We first review why the approach almost works, and then examine some of the surprising behavior it may entail. We further illustrate that there are very simple cases in which a pure library-based approach seems incapable of expressing an efficient parallel algorithm. Our discussion takes place in the context of C with Pthreads, since it is commonly used, reasonably well specified, and does not attempt to ensure type-safety, which would entail even stronger constraints. The issues we raise are not specific to that context. http://www.hpl.hp.com/techreports/2004/HPL-2004-209.pdf
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things i would ban from clc jgk@panix.com (Joe keane) - 2012-03-11 23:05 +0000
Re: things i would ban from clc Keith Thompson <kst-u@mib.org> - 2012-03-12 10:33 -0700
Re: things i would ban from clc gazelle@shell.xmission.com (Kenny McCormack) - 2012-03-12 23:57 +0000
Re: things i would ban from clc jacob navia <jacob@spamsink.net> - 2012-03-12 18:44 +0100
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-12 12:26 -0700
Re: things i would ban from clc "osmium" <r124c4u102@comcast.net> - 2012-03-12 14:36 -0600
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-12 13:57 -0700
Re: things i would ban from clc James Kuyper <jameskuyper@verizon.net> - 2012-03-12 17:34 -0400
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-12 15:00 -0700
Re: things i would ban from clc James Kuyper <jameskuyper@verizon.net> - 2012-03-12 18:21 -0400
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-12 15:43 -0700
Re: things i would ban from clc jacob navia <jacob@spamsink.net> - 2012-03-12 23:53 +0100
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-12 17:17 -0700
Re: things i would ban from clc jacob navia <jacob@spamsink.net> - 2012-03-13 09:09 +0100
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-13 01:24 -0700
Re: things i would ban from clc Keith Thompson <kst-u@mib.org> - 2012-03-13 05:59 -0700
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-13 10:55 -0700
Re: things i would ban from clc blp@cs.stanford.edu (Ben Pfaff) - 2012-03-13 11:07 -0700
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-13 11:25 -0700
Re: things i would ban from clc blp@cs.stanford.edu (Ben Pfaff) - 2012-03-13 11:32 -0700
Re: things i would ban from clc Keith Thompson <kst-u@mib.org> - 2012-03-13 12:18 -0700
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-13 16:13 -0700
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-13 13:49 -0700
Re: things i would ban from clc James Kuyper <jameskuyper@verizon.net> - 2012-03-13 17:14 -0400
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-13 14:35 -0700
Re: things i would ban from clc James Kuyper <jameskuyper@verizon.net> - 2012-03-13 18:09 -0400
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-13 16:06 -0700
Re: things i would ban from clc "io_x" <a@b.c.invalid> - 2012-03-14 08:18 +0100
Re: things i would ban from clc "io_x" <a@b.c.invalid> - 2012-03-14 10:07 +0100
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-14 12:41 -0700
Re: things i would ban from clc "io_x" <a@b.c.invalid> - 2012-03-14 21:53 +0100
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-15 14:16 -0700
Re: things i would ban from clc "io_x" <a@b.c.invalid> - 2012-03-18 07:14 +0100
Re: things i would ban from clc Jens Gustedt <jens.gustedt@loria.fr> - 2012-03-14 10:39 +0100
Re: things i would ban from clc Ben Pfaff <blp@cs.stanford.edu> - 2012-03-13 14:33 -0700
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-13 14:40 -0700
Re: things i would ban from clc Tim Rentsch <txr@alumni.caltech.edu> - 2012-03-13 16:25 -0700
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-14 00:51 -0700
Re: things i would ban from clc Tim Rentsch <txr@alumni.caltech.edu> - 2012-03-14 14:25 -0700
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-15 13:40 -0700
Re: things i would ban from clc Tim Rentsch <txr@alumni.caltech.edu> - 2012-03-18 17:05 -0700
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-23 11:59 -0700
Re: things i would ban from clc Robert Wessel <robertwessel2@yahoo.com> - 2012-03-23 17:02 -0500
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-23 16:51 -0700
Re: things i would ban from clc "io_x" <a@b.c.invalid> - 2012-03-24 07:16 +0100
Re: things i would ban from clc Tim Rentsch <txr@alumni.caltech.edu> - 2012-03-27 11:26 -0700
Re: things i would ban from clc Kaz Kylheku <kaz@kylheku.com> - 2012-03-23 19:43 +0000
Re: things i would ban from clc Rui Maciel <rui.maciel@gmail.com> - 2012-03-23 19:45 +0000
Re: things i would ban from clc Jens Gustedt <jens.gustedt@loria.fr> - 2012-03-23 23:49 +0100
Re: things i would ban from clc Ian Collins <ian-news@hotmail.com> - 2012-03-24 11:54 +1300
Re: things i would ban from clc Jens Gustedt <jens.gustedt@loria.fr> - 2012-03-24 09:26 +0100
Re: things i would ban from clc gwowen <gwowen@gmail.com> - 2012-03-26 07:31 -0700
Re: things i would ban from clc Kaz Kylheku <kaz@kylheku.com> - 2012-03-24 05:45 +0000
Re: things i would ban from clc Jens Gustedt <jens.gustedt@loria.fr> - 2012-03-24 09:31 +0100
Re: things i would ban from clc James Kuyper <jameskuyper@verizon.net> - 2012-03-13 14:34 -0400
Re: things i would ban from clc Tim Rentsch <txr@alumni.caltech.edu> - 2012-03-13 16:18 -0700
Re: things i would ban from clc "io_x" <a@b.c.invalid> - 2012-03-14 08:18 +0100
Re: things i would ban from clc Tim Rentsch <txr@alumni.caltech.edu> - 2012-03-14 14:06 -0700
Re: things i would ban from clc Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-03-15 15:22 +0000
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-15 12:26 -0700
Re: things i would ban from clc jacob navia <jacob@spamsink.net> - 2012-03-15 21:28 +0100
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-15 13:49 -0700
Re: things i would ban from clc Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-15 16:36 +0000
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-15 12:16 -0700
Re: things i would ban from clc Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-16 00:13 +0000
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-15 20:40 -0700
Re: things i would ban from clc gwowen <gwowen@gmail.com> - 2012-03-13 01:52 -0700
Re: things i would ban from clc "io_x" <a@b.c.invalid> - 2012-03-13 11:31 +0100
Re: things i would ban from clc jacob navia <jacob@spamsink.net> - 2012-03-13 11:41 +0100
Re: things i would ban from clc gwowen <gwowen@gmail.com> - 2012-03-13 06:06 -0700
Re: things i would ban from clc jacob navia <jacob@spamsink.net> - 2012-03-13 15:06 +0100
Re: things i would ban from clc ImpalerCore <jadill33@gmail.com> - 2012-03-13 07:46 -0700
Re: things i would ban from clc jacob navia <jacob@spamsink.net> - 2012-03-13 19:08 +0100
Re: things i would ban from clc Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-13 13:20 +0000
Re: things i would ban from clc Jens Gustedt <jens.gustedt@loria.fr> - 2012-03-13 20:41 +0100
Re: things i would ban from clc Kaz Kylheku <kaz@kylheku.com> - 2012-03-13 19:34 +0000
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-13 16:14 -0700
Re: things i would ban from clc Kaz Kylheku <kaz@kylheku.com> - 2012-03-13 23:28 +0000
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-13 21:18 -0700
Re: things i would ban from clc Ian Collins <ian-news@hotmail.com> - 2012-03-13 20:19 +1300
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-13 01:09 -0700
Re: things i would ban from clc Ian Collins <ian-news@hotmail.com> - 2012-03-13 21:32 +1300
Re: things i would ban from clc nick_keighley_nospam@hotmail.com - 2012-03-13 01:52 -0700
Re: things i would ban from clc "io_x" <a@b.c.invalid> - 2012-03-13 11:31 +0100
Re: things i would ban from clc nick_keighley_nospam@hotmail.com - 2012-03-14 01:18 -0700
Re: things i would ban from clc Don Y <this@isnotme.com> - 2012-03-14 12:09 -0700
Re: things i would ban from clc ArifulHossain tuhin <etothepowerpi@gmail.com> - 2012-03-14 13:01 -0700
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