pthread.h please help

I am trying to spawn a thread that is a member function:

pthread_create(&thread, NULL, (void*)&CLASSNAME::functionname, NULL);

I am getting this error message:
converting from 'void (CLASSNAME::*)()' to 'void *'
ANSI C++ forbids implicit conversion from 'void*' in argument passing

any help would be appreciated.

Thanks,
Mark Fleureton

sportvette wrote:
> I am trying to spawn a thread that is a member function:

You can't. At least not directly.
Member functions and regular functions are different, incompatible
creatures.
Member functions operate on an object; where (oh where) is this object
supposed to come from?

>
> pthread_create(&thread, NULL, (void*)&CLASSNAME::functionname, NULL);
>
> I am getting this error message:
> converting from 'void (CLASSNAME::*)()' to 'void *'
> ANSI C++ forbids implicit conversion from 'void*' in argument passing

OK. You're trying a cast (one which makes no sense on its face) -- and
you're even casting to the WRONG TYPE!

[have you even looked at the prototype for pthread_create()?]

What you need to do is write a wrapper with "C" linkage to pass to
pthread_create().

BTW - WTF are you asking this here? More significantly, this comes up on
news:comp.programming.threads (where this question would belong if it
hadn't been asked and answered countless times already) every week or
so. Have you bothered to look (or lurk) there?

--ag

--
Artie Gold -- Austin, Texas