Thread: pass arguments to p_thread

A solution (not tested yet):
I have one, I will make a constructor which will take the arguments and assign them to data members. Run() will acess them and I think this will work.
~~~~~~~~~~~~~~

I have to use p_thread with C++ (rules are rules).

I had implemented a job scheduler doing this and every job was actually a ComputePi method, which received no arguments. Now, I need to pass arguments to it. I want to process a vector with a method. Every method will proccess a range of the vector.

The job scheduler actually handles Tasks.

Code:

class Task {
 public:
  Task(Job* job_, JobListener* listener_,
    std::vector< std::pair<int, JobStatus> >& p, int i_)
    : job(job_), listener(listener_), profile(p), i(i_), exit_code((void*)-1) {
    int not_ok = pthread_create( &thread, NULL, &Job::RunHelper, job);
    if(not_ok) { status() = ERROR; std::cout << "Error at creation\n"; }
    else status() = RUNNING;
  }
  ...
};
p.

and then the job class is this

Code:

class Job {
 public:
  Job() { }
  virtual ~Job() { }

  // This method should be implemented by subclasses.
  virtual void* Run(void*) = 0;

  static void *RunHelper(void *classRef)
  {
    struct arg_struct args;
    args.arg1 = 5;
    args.arg2 = 7;
    return ((Job *)classRef)->Run((void*)&args); // I would call this as ..->Run(NULL); when I didn't need arguments
  }
  ....
};

and then in the class of ComputePi, I have

Code:

class ComputePi : public Job {
public:
  ComputePi(int steps) : steps_(steps) { }

  void* Run(void* arguments) {
    if(arguments == NULL) std::cout << "u" << std::endl;
    ..
  }

However, 'u' is printed all the time and when I try to acess 'arguments', it crashes, since 'arguments' is NULL.

Any idea how to pass the arguments?