Compilers - multi threaded bison: yyerror

Author

multi threaded bison: yyerror

Tamas Sarlos

2004-07-28, 9:08 pm

Hi,

I'd like to upgrade my flex/bison generated parser to a multi threaded
(pthreads) parser. I know that I have to create a reentrant flex
wrapper and use %pure_parser in bison.

I need to stop parsing (and do some other things) whenever a syntax
error occurs. However yyerror(...) does not have any parameter which
would help to find out in which thread the syntax error occured. I
could use pthread_self() and associate the necessary data with the
thread id, but this solution seems somewhat awkward. Is there a better
way to do it?

Thanks in advance,
Tamas Sarlos,
Budapest, Hungary

John Millaway

2004-08-05, 3:59 pm

> error occurs. However yyerror(...) does not have any parameter which
> would help to find out in which thread the syntax error occured.

Hi Tamas,

#define yyerror(s) yyerror_r(s, thread_specific_info)

-John M

Laurence Finston

2004-08-05, 3:59 pm

On Wed, 28 Jul 2004, Tamas Sarlos wrote:

>
> I'd like to upgrade my flex/bison generated parser to a multi threaded
> (pthreads) parser.

....

> Is there a better
> way to do it?

I suggest using thread-specific data (pthread_key_create(),
pthread_setspecific() and pthread_getspecific()).

In my parser, the object passed to `yyparse()' via a `void*' contains
a pointer to the object containing the thread-specific data, so I don't actually
need to call `pthread_getspecific()' very often.

If you want to look at my code, it's available under
http://savannah.gnu.org/cgi-bin/vie...df/3dldf/Group/

Laurence Finston
GNU 3DLDF maintainer
http://www.gnu.org/software/3dldf

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