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pthread issue with the function to be run

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Join Date: Sep 2008

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rmlopes

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pthread issue with the function to be run

Jun 16th, 2009

Hi all,

I am new to threads in c++, and I must use the pthread library. The documentation is easy to understand, but there is a more general aspect that I am missing. My question is: Is it possible to give a pointer to an object's function as argument to pthread_create()?
I tried, without success, something like this:

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 cpp Syntax (Toggle Plain Text) 
struct Obj{
  int i;
  Obj( int n ): i(n){}
  void* myfun(void* ptr){}
}
 
Obj o(6);
pthread_create( handler, NULL, &(o.myfun), NULL);
struct Obj{
  int i;
  Obj( int n ): i(n){}
  void* myfun(void* ptr){}
}

Obj o(6);
pthread_create( handler, NULL, &(o.myfun), NULL);

Thank you

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Join Date: Oct 2008

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adatapost

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Re: pthread issue with the function to be run

-1

Jun 17th, 2009

You have to mention the name of function and address of handler with pthread_create arguments.

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pthread_create( &handler, NULL, o.myfun, NULL);
pthread_create( &handler, NULL, o.myfun, NULL);

Failure is not fatal, but failure to change might be. - John Wooden

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Join Date: Oct 2008

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adatapost

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Re: pthread issue with the function to be run

Jun 17th, 2009

I regret.
I didn't notice : Is it possible to give a pointer to an object's function.
You cann't use instance member function's address with pthread_create function. It must be static.

You have to use & (an address operator) with handler variable and do not put & (address operator) with o.myfun (which is 3rd argument). - but the must be static.

Last edited by adatapost; Jun 17th, 2009 at 6:07 am.

Failure is not fatal, but failure to change might be. - John Wooden

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Join Date: Sep 2008

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rmlopes

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Re: pthread issue with the function to be run

Jun 17th, 2009

Hi all,

Thank you adatapost for your attention and reply.
Just a while ago I found http://www.parashift.com/c++-faq-lit...o-members.html in which point 33.2 explicitly explains my situation.

Rui