Very Computer

by **Richard Wan** » Sat, 22 May 1999 04:00:00

Hi,

Does anybody do pthread and C++ knows how to create a C++ object as a thread
with pthread?

by **Rx Vide** » Sat, 22 May 1999 04:00:00

Hello,

I don't know what exactly are you trying to do. If you want to create an object
within a thread, then you just create it.
If you want to have an object which 'impersonates' a thread (has a function
which runs in a separate thread), then you have to do one of the two things:

Since class member functions (or pointers to them) differ from the regular
functions in that they have to contain a pointer to the actual object plus the
pointer to the member function, you cannot pass such a function to the
pthread_create.

You can declare one of the member functions as static, or you can declare an
external function (not a member, just a regular f.) and make it a friend of your
class. In both cases you have to pass the pointer to the actual object as an
argument to your function in pthread_call.

class theClass;

void* theFunction(void* param)
{
theClass* ptr=static_cast<theClass*>(param);

ptr->doSomething();
ptr->var=0;

Quote:}

class theClass
{
friend void* theFunction(void* param);

int var;
void doSomething();

Quote:};

HTH,

Martin

> Hi,

> Does anybody do pthread and C++ knows how to create a C++ object as a thread
> with pthread?

by **Juergen Hein** » Sat, 22 May 1999 04:00:00

>Hi,

>Does anybody do pthread and C++ knows how to create a C++ object as a thread
>with pthread?

See comp.programming.threads ... this questions shows up often as does
the wrong answer of using a static member function to pass it to
pthread_create(), so read the group, it is very informative and helpful.

Cheers,
Juergen

--
\ Real name : Jrgen Heinzl \ no flames /

Very Computer

Create a C++ object as a thread with Pthread

Create a C++ object as a thread with Pthread

Create a C++ object as a thread with Pthread

Create a C++ object as a thread with Pthread