how to make a class member function as the start function for the
pthread_create

my code::

class thread
{
public :
void * run( void *);

void start( )
{
pthread_t tid;
pthread_create ( & tid, NULL, &run, NULL );
}
};

:The compiler complains that it cannot perform a cast from
void * (thread::*) (void * )  to void *(*)(void *)

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"googler" <arun_ccjl@yahoo.co.in> writes:

> how to make a class member function as the start function for the
> pthread_create

You can ususally get away with making it a static class member
function, but strictly speaking you should just define a free function
that takes a pointer to the object.

Joe
--
We can't all be heroes because someone has to sit on the curb and
clap as they go by.
- Will Rogers

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"googler" <arun_ccjl@yahoo.co.in> wrote in message news:<cddk7o$fqf@odbk17.prod.google.com>.
.
> how to make a class member function as the start function for the
> pthread_create
>
> my code::
>
> class thread
> {
> public :
> void * run( void *);
>
> void start( )
> {
> pthread_t tid;
> pthread_create ( & tid, NULL, &run, NULL );
> }
> };
>
> :The compiler complains that it cannot perform a cast from
> void * (thread::*) (void * )  to void *(*)(void *)

The problem is that the C++ class methods have a hidden argument,
which is the pointer to the structure in the name of which the
function executes ("this"). This is true in case the function is not
static. You could try making run() be static method, and then try
again.

This problem is pretty often, since pthread library is a C interface,
not C++.

Cheers

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