src/servers/registrar/EventQueue.h

   1 //------------------------------------------------------------------------------
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   3 //
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   5 //      copy of this software and associated documentation files (the "Software"),
   6 //      to deal in the Software without restriction, including without limitation
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   8 //      and/or sell copies of the Software, and to permit persons to whom the
   9 //      Software is furnished to do so, subject to the following conditions:
  10 //
  11 //      The above copyright notice and this permission notice shall be included in
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  14 //      THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 //      IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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  20 //      DEALINGS IN THE SOFTWARE.
  21 //
  22 //      File Name:              EventQueue.h
  23 //      Author:                 Ingo Weinhold (bonefish@users.sf.net)
  24 //                                      YellowBites (http://www.yellowbites.com)
  25 //      Description:    A class providing a mechanism for executing events at
  26 //                                      specified times.
  27 //------------------------------------------------------------------------------
  28
  29 #ifndef EVENT_QUEUE_H
  30 #define EVENT_QUEUE_H
  31
  32 #include <List.h>
  33 #include <Locker.h>
  34 #include <OS.h>
  35
  36 class Event;
  37
  38 class EventQueue : public BLocker {
  39 public:
  40         EventQueue(const char *name = NULL);
  41         virtual ~EventQueue();
  42
  43         status_t InitCheck();
  44
  45         void Die();
  46
  47         bool AddEvent(Event *event);
  48         bool RemoveEvent(Event *event);
  49         void ModifyEvent(Event *event, bigtime_t newTime);
  50
  51  private:
  52         bool _AddEvent(Event *event);
  53         bool _RemoveEvent(Event *event);
  54         Event *_EventAt(int32 index) const;
  55         int32 _IndexOfEvent(Event *event) const;
  56         int32 _FindInsertionIndex(bigtime_t time) const;
  57
  58         static  int32 _EventLooperEntry(void *data);
  59         int32 _EventLooper();
  60         void _Reschedule();
  61
  62         BList                           fEvents;
  63         thread_id                       fEventLooper;
  64         sem_id                          fLooperControl;
  65         volatile bigtime_t      fNextEventTime;
  66         status_t                        fStatus;
  67         volatile bool           fTerminating;
  68 };
  69
  70 #endif  // EVENT_QUEUE_H