src/threadUtils.hpp

   1 /*
   2  *  anytun
   3  *
   4  *  The secure anycast tunneling protocol (satp) defines a protocol used
   5  *  for communication between any combination of unicast and anycast
   6  *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
   7  *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
   8  *  ethernet, ip, arp ...). satp directly includes cryptography and
   9  *  message authentication based on the methodes used by SRTP.  It is
  10  *  intended to deliver a generic, scaleable and secure solution for
  11  *  tunneling and relaying of packets of any protocol.
  12  *
  13  *
  14  *  Copyright (C) 2007-2008 Othmar Gsenger, Erwin Nindl,
  15  *                          Christian Pointner <satp@wirdorange.org>
  16  *
  17  *  This file is part of Anytun.
  18  *
  19  *  Anytun is free software: you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License version 3 as
  21  *  published by the Free Software Foundation.
  22  *
  23  *  Anytun is distributed in the hope that it will be useful,
  24  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  *  GNU General Public License for more details.
  27  *
  28  *  You should have received a copy of the GNU General Public License
  29  *  along with anytun.  If not, see <http://www.gnu.org/licenses/>.
  30  */
  31 #include <boost/thread.hpp>
  32 #include <boost/thread/mutex.hpp>
  33 #ifndef __THREADUTILS__
  34 #define __THREADUTILS__
  35 typedef boost::mutex::scoped_lock Lock;
  36 typedef boost::mutex Mutex;
  37
  38 class Semaphore
  39 {
  40 public:
  41   Semaphore(unsigned int initVal=0)
  42     :count_(initVal){};
  43   void up()
  44   {
  45      boost::mutex::scoped_lock lock(mutex_);
  46      count_++;
  47      lock.unlock();
  48      cond_.notify_one();
  49   }
  50   void down()
  51   {
  52      boost::mutex::scoped_lock lock(mutex_);
  53      while (count_ <= 0)
  54        cond_.wait(lock);
  55      count_--;
  56   }
  57 private:
  58   boost::mutex mutex_;
  59   boost::condition cond_;
  60   int16_t count_;
  61 };
  62
  63 #endif