?
Solved

Pass member function to pthread_create

Posted on 2007-04-05
2
Medium Priority
?
1,219 Views
Last Modified: 2008-10-20
Apparently it's possible to pass a class member function to pthread_create if the member function is declared static.  At least, the following code compiles on gcc with no warnings:

class test {
      public:
      static void* threadf(void* args)
      {
            cout << "testing..." << endl;
            return NULL;
      }
};

int main() {
      test t;

      pthread_t thread;
      pthread_create(&thread, NULL, t.threadf, NULL);      
      pthread_join(thread, NULL);
}

Question:

Is this portable?  Is this allowed by the standard, or is gcc simply allowing this.
0
Comment
Question by:chsalvia
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 48

Accepted Solution

by:
AlexFM earned 500 total points
ID: 18862466
Yes, this is allowed by standard. Static class method is actually global function, which can be accessed through class name. Non-static method has hidden "this" parameter. Both static method and global function don't have hidden parameter, this is the difference.
0
 
LVL 11

Assisted Solution

by:DeepuAbrahamK
DeepuAbrahamK earned 500 total points
ID: 18862784
Yes,static class methods are global hence it can be accessed.

class MyThread
{
....
static void* __stdcall ThreadProc(LPVOID lpVoid);
...
};

call this ThreadProc using _beginthread/ex/CreateThread..

HANDLE h_Thread;
h_Thread = (HANDLE)_beginthreadex(NULL,// Security
                  0,// Stack size - use default
                  ThreadProc,// Thread fn entry point -> note we have not used the class object here
                  (void*)this,// Param for thread any class object etc..if it is there else NULL
                  0,// Init flag
                  &nThreadID);// Thread address
Best Regards,
DeepuAbrahamK
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

When writing generic code, using template meta-programming techniques, it is sometimes useful to know if a type is convertible to another type. A good example of when this might be is if you are writing diagnostic instrumentation for code to generat…
Templates For Beginners Or How To Encourage The Compiler To Work For You Introduction This tutorial is targeted at the reader who is, perhaps, familiar with the basics of C++ but would prefer a little slower introduction to the more ad…
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.
Suggested Courses

771 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question