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| From | BGB <cr88192@hotmail.com> |
|---|---|
| Newsgroups | comp.lang.c, alt.os.development |
| Subject | Re: Exception propagation in C |
| Date | 2011-12-31 10:40 -0600 |
| Organization | albasani.net |
| Message-ID | <jdndul$nit$1@news.albasani.net> (permalink) |
| References | <99fbedd4-b37f-4ced-8759-4ba9656259dc@m7g2000vbc.googlegroups.com> <jdidp0$v8c$1@news.albasani.net> <541969d7-e4ab-43ba-8cf5-679f18eb3221@m4g2000vbc.googlegroups.com> <4EFF02A7.1070909@loria.fr> |
Cross-posted to 2 groups.
On 12/31/2011 6:40 AM, Jens Gustedt wrote:
> Am 12/30/2011 10:38 PM, schrieb James Harris:
>> On Dec 29, 7:07 pm, BGB<cr88...@hotmail.com> wrote:
>>> On 12/29/2011 11:52 AM, James Harris wrote:
>
>>> TLS variables are not standard C (but are supported by MSVC and GCC).
>
> Officially they are since some weeks now, they come with C11
>
ok, I hadn't looked much at C11 recently...
who knows how long until it is really well supported though, as it has
been long enough just waiting for MSVC to support C99 stuff...
>> I can't see TLS as C or not C. Wouldn't TLS be a characteristic of the
>> environment in which the C code runs?
>
> according to C11 thread local variables and atomics are part of the
> language (new keywords _Thread_local and _Atomic) and functions
> associated to threads and atomic operations form optional components
> of the C library for hosted environments.
>
and alas they couldn't just reuse GCC's keywords?...
well, in any case, probably macro magic.
> And these tools clearly ease the programming of some try/catch mechnism
> with macros in C.
>
yep.
I had forgot about a trick I had actually used before:
one can fake TLS using a macro wrapping a function call.
say:
int *foo_errno_fcn()
{ ... }
#define foo_errno (*foo_errno_fcn())
granted, this still doesn't allow a single operation to access it (as in
the OP), but really, who really needs to care?...
one case, something was due to me having initially used straightforward
TLS variables, but then running into a case where they "didn't really
work so well" on WinXP (top-level declared TLS variables are fussy /
prone-to-breaking on WinXP and earlier), but a wrapped function call was
more reliable.
not that I think status codes located within TLS are really a sane
exception mechanism (they can be sanely used, but IMO can't be sanely
called exceptions...).
most often, I pass state in passed context structs, but in some cases
have used "context binding" where one may need a TLS variable mostly to
hold a pointer to the context.
nevermind the potential need for TLS to implement things like nested
exceptions.
hmm:
in C one could use macros to be like:
BEGIN_TRY
...
END_TRY
BEGIN_CATCH(FooException, ex)
...
END_CATCH
BEGIN_FINALLY
...
END_FINALLY
nevermind if the syntax is horrid...
(technically, this could probably be implemented via if/else magic).
#define BEGIN_TRY if(fooBeginTry()) {
#define END_TRY fooEndTry();}
#define BEGIN_CATCH(ext, exn) else if(fooCatchException(#ext)) { \
ext exn=fooGetException();
#define END_CATCH }
#define BEGIN_FINALLY else{
#define END_FINALLY fooThrowCurrentException();}
(one may forsake using all caps...).
or such...
Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2011-12-29 09:52 -0800
Re: Exception propagation in C jacob navia <jacob@spamsink.net> - 2011-12-29 19:40 +0100
Re: Exception propagation in C BGB <cr88192@hotmail.com> - 2011-12-29 14:03 -0600
Re: Exception propagation in C BGB <cr88192@hotmail.com> - 2011-12-29 13:07 -0600
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2011-12-30 13:38 -0800
Re: Exception propagation in C BGB <cr88192@hotmail.com> - 2011-12-30 20:24 -0600
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-01-03 02:19 -0800
Re: Exception propagation in C BGB <cr88192@hotmail.com> - 2012-01-03 14:04 -0600
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-01-04 04:26 -0800
Re: Exception propagation in C BGB <cr88192@hotmail.com> - 2012-01-06 14:05 -0600
Re: Exception propagation in C jacob navia <jacob@spamsink.net> - 2012-01-06 23:54 +0100
Re: Exception propagation in C "Ed Coran" <sysdev@new.net> - 2012-01-06 22:24 -0600
Re: Exception propagation in C jacob navia <jacob@spamsink.net> - 2012-01-07 09:15 +0100
Re: Exception propagation in C "Ed Coran" <sysdev@new.net> - 2012-01-08 23:45 -0600
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-01-08 12:52 -0800
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-01-08 14:20 -0800
Re: Exception propagation in C jacob navia <jacob@spamsink.net> - 2012-01-09 00:19 +0100
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-01-08 21:12 -0800
Re: Exception propagation in C Scott Wood <scott@buserror.net> - 2012-01-08 23:41 -0600
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-01-09 11:00 -0800
Re: Exception propagation in C Scott Wood <scott@buserror.net> - 2012-01-10 00:42 -0600
Re: Exception propagation in C jgk@panix.com (Joe keane) - 2012-01-11 07:40 +0000
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-01-11 12:59 -0800
Re: Exception propagation in C "Ed Coran" <sysdev@new.net> - 2012-01-09 00:05 -0600
Re: Exception propagation in C Ian Collins <ian-news@hotmail.com> - 2012-01-09 20:40 +1300
Re: Exception propagation in C "Ed Coran" <sysdev@new.net> - 2012-01-09 04:53 -0600
Re: Exception propagation in C 88888 Dihedral <dihedral88888@googlemail.com> - 2012-01-09 05:49 -0800
Re: Exception propagation in C Scott Wood <scott@buserror.net> - 2012-01-08 17:29 -0600
Re: Exception propagation in C jacob navia <jacob@spamsink.net> - 2012-01-09 00:37 +0100
Re: Exception propagation in C Nomen Nescio <nobody@dizum.com> - 2012-01-09 11:36 +0100
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-01-09 11:08 -0800
Re: Exception propagation in C Scott Wood <scott@buserror.net> - 2012-01-05 01:25 -0600
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-01-05 09:18 -0800
Re: Exception propagation in C "s_dubrovich@yahoo.com" <s_dubrovich@yahoo.com> - 2011-12-30 21:20 -0800
Re: Exception propagation in C "Rod Pemberton" <do_not_have@noavailemail.cmm> - 2011-12-31 06:19 -0500
Re: Exception propagation in C Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-01 10:32 -0800
Re: Exception propagation in C "Rod Pemberton" <do_not_have@noavailemail.cmm> - 2011-12-31 05:53 -0500
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-01-01 16:30 -0800
Re: Exception propagation in C "Rod Pemberton" <do_not_have@noavailemail.cmm> - 2012-01-02 01:50 -0500
Re: Exception propagation in C Scott Wood <scott@buserror.net> - 2012-01-02 02:03 -0600
Re: Exception propagation in C "Rod Pemberton" <do_not_have@noavailemail.cmm> - 2012-01-02 15:59 -0500
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-01-03 04:12 -0800
Re: Exception propagation in C Scott Wood <scott@buserror.net> - 2012-01-04 23:53 -0600
Re: Exception propagation in C "Rod Pemberton" <do_not_have@noavailemail.cmm> - 2012-01-05 06:45 -0500
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-01-03 04:16 -0800
Re: Exception propagation in C Keith Thompson <kst-u@mib.org> - 2012-01-03 11:50 -0800
Re: Exception propagation in C Jens Gustedt <jens.gustedt@loria.fr> - 2011-12-31 13:40 +0100
Re: Exception propagation in C BGB <cr88192@hotmail.com> - 2011-12-31 10:40 -0600
Re: Exception propagation in C Jens Gustedt <jens.gustedt@loria.fr> - 2012-01-02 16:49 +0100
Re: Exception propagation in C BGB <cr88192@hotmail.com> - 2012-01-02 13:02 -0600
Re: Exception propagation in C Dr Nick <3-nospam@temporary-address.org.uk> - 2012-01-02 19:53 +0000
Re: Exception propagation in C ImpalerCore <jadill33@gmail.com> - 2012-01-02 13:10 -0800
Re: Exception propagation in C ImpalerCore <jadill33@gmail.com> - 2012-01-02 12:58 -0800
Re: Exception propagation in C Jens Gustedt <jens.gustedt@loria.fr> - 2012-01-04 18:01 +0100
Re: Exception propagation in C BGB <cr88192@hotmail.com> - 2012-01-06 14:38 -0600
Re: Exception propagation in C "Rod Pemberton" <do_not_have@noavailemail.cmm> - 2012-01-06 21:40 -0500
Re: Exception propagation in C Kaz Kylheku <kaz@kylheku.com> - 2011-12-29 21:02 +0000
Re: Exception propagation in C jacob navia <jacob@spamsink.net> - 2011-12-30 10:38 +0100
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2011-12-30 14:38 -0800
Re: Exception propagation in C "Rod Pemberton" <do_not_have@noavailemail.cmm> - 2011-12-29 18:37 -0500
Re: Exception propagation in C "BartC" <bc@freeuk.com> - 2011-12-30 01:07 +0000
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2011-12-30 14:07 -0800
Re: Exception propagation in C Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-12-30 17:53 -0500
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-01-03 03:56 -0800
Re: Exception propagation in C jgk@panix.com (Joe keane) - 2012-01-02 09:49 +0000
Re: Exception propagation in C Kleuske <kleuske@nowhere.net> - 2012-01-02 10:51 +0000
Re: Exception propagation in C "Rod Pemberton" <do_not_have@noavailemail.cmm> - 2012-01-02 16:01 -0500
Re: Exception propagation in C Kleuske <kleuske@nowhere.net> - 2012-01-03 11:14 +0000
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-01-03 03:59 -0800
Re: Exception propagation in C Kleuske <kleuske@nowhere.net> - 2012-01-03 12:09 +0000
Re: Exception propagation in C jgk@panix.com (Joe keane) - 2012-01-03 21:25 +0000
Re: Exception propagation in C James Harris <james.harris.1@googlemail.com> - 2012-02-15 14:24 -0800
Re: Exception propagation in C jgk@panix.com (Joe keane) - 2012-02-17 22:38 +0000
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