src/beacon/detail/future_event_base.hpp

   1 /**
   2  * beacon
   3  * Author: Lukas Krejci <krejci.l@centrum.cz>, (C) 2008
   4  * Copyright: See COPYING file that comes with this distribution
   5  */
   6
   7 #ifndef BEACON_DETAIL_FUTURE_EVENT_BASE_H
   8 #define BEACON_DETAIL_FUTURE_EVENT_BASE_H
   9
  10 #include <boost/thread/mutex.hpp>
  11 #include <boost/thread/condition.hpp>
  12 #include <beacon/exceptions.hpp>
  13 #include <beacon/reference_countable.hpp>
  14
  15 namespace beacon {
  16
  17 namespace detail {
  18
  19 //forward decl
  20 class in_queue_invoke_base;
  21
  22 /**
  23  * A base class for future_event class that implements the event_loop
  24  * aware functionality inside the library.
  25  */
  26 class future_event_base : public reference_countable {
  27     friend class in_queue_invoke_base;
  28
  29     typedef boost::mutex::scoped_lock lock;
  30
  31     public:
  32         future_event_base() : value(0), _finished(false),
  33                           _waiting(false) {
  34         }
  35
  36         ~future_event_base();
  37     protected:
  38
  39         /** currently always fails returning false */
  40         bool cancel();
  41         bool finished() const;
  42
  43         void set(void * value);
  44         void * get() throw (execution_exception);
  45         void * get(int timeout) throw(execution_exception, timeout_exception);
  46
  47     private:
  48         boost::mutex monitor;
  49         boost::condition value_set;
  50         void * value;
  51         bool _finished;
  52         bool _waiting;
  53 };
  54
  55 } //namespace detail
  56
  57 } //namespace
  58
  59 #endif