ceph/branches/riccardo/monitor2/common/Thread.h

// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
/*
 * Ceph - scalable distributed file system
 *
 * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
 *
 * This is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 2.1, as published by the Free Software 
 * Foundation.  See file COPYING.
 * 
 */


#ifndef __THREAD_H
#define __THREAD_H

#include <pthread.h>

class Thread {
 private:
  pthread_t thread_id;

 public:
  Thread() : thread_id(0) {}
  virtual ~Thread() {}

  pthread_t &get_thread_id() { return thread_id; }
  bool is_started() { return thread_id != 0; }

  virtual void *entry() = 0;

 private:
  static void *_entry_func(void *arg) {
    return ((Thread*)arg)->entry();
  }

 public:
  int create() {
    return pthread_create( &thread_id, NULL, _entry_func, (void*)this );
  }

  bool am_self() {
    return (pthread_self() == thread_id);
  }

  int join(void **prval = 0) {
    if (thread_id == 0) return -1;   // never started.
    int status = pthread_join(thread_id, prval);
    if (status == 0) 
      thread_id = 0;
    else {
      cout << "join status = " << status << endl;
      assert(0);
    }
    return status;
  }
};

#endif