src/Timer.cpp

   1 //
   2 // This file is part of the aMule Project.
   3 //
   4 // Copyright (c) 2003-2008 aMule Team ( admin@amule.org / http://www.amule.org )
   5 //
   6 // Any parts of this program derived from the xMule, lMule or eMule project,
   7 // or contributed by third-party developers are copyrighted by their
   8 // respective authors.
   9 //
  10 // This program is free software; you can redistribute it and/or modify
  11 // it under the terms of the GNU General Public License as published by
  12 // the Free Software Foundation; either version 2 of the License, or
  13 // (at your option) any later version.
  14 //
  15 // This program is distributed in the hope that it will be useful,
  16 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 // GNU General Public License for more details.
  19 //
  20 // You should have received a copy of the GNU General Public License
  21 // along with this program; if not, write to the Free Software
  22 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
  23 //
  24
  25 #include "Timer.h"              // Interface declaration
  26 #include "GetTickCount.h"       // Needed for GetTickCountFullRes
  27 #include "MuleThread.h"         // Needed for CMuleThread
  28
  29
  30 //////////////////////// Timer Thread ////////////////////
  31
  32 class CTimerThread : public CMuleThread
  33 {
  34 public:
  35         CTimerThread()
  36                 : CMuleThread(wxTHREAD_JOINABLE)
  37         {
  38         }
  39
  40         void* Entry() {
  41                 CTimerEvent evt(m_id);
  42
  43                 uint32 lastEvent = GetTickCountFullRes();
  44                 do {
  45                         // current time
  46                         uint32 now = GetTickCountFullRes();
  47                         // This is typically zero, because lastEvent was already incremented by one period.
  48                         sint32 delta = now - lastEvent;
  49                         if (delta > 100 * m_period) {
  50                                 // We're way too far behind.  Probably what really happened is
  51                                 // the system time was adjusted backwards a bit.  So,
  52                                 // the calculation of delta has produced an absurd value.
  53                                 delta = 100 * m_period;
  54                                 lastEvent = now - delta;
  55                         }
  56
  57                         // Wait one period (adjusted by the difference just calculated)
  58                         sint32 timeout = ((m_period < delta) ? 0 : (m_period - delta));
  59
  60                         // In normal operation, we will never actually acquire the
  61                         // semaphore; we will always timeout.  This is used to
  62                         // implement a Sleep operation which the owning CTimer can
  63                         // interrupt by posting to the semaphore.  So, it follows
  64                         // that if we do acquire the semaphore it means the owner
  65                         // wants us to exit.
  66                         if (m_sleepSemaphore.WaitTimeout(timeout) == wxSEMA_TIMEOUT) {
  67                                 // Increment for one event only, so no events can be lost.
  68                                 lastEvent += m_period;
  69
  70                                 wxPostEvent(m_owner, evt);
  71                         } else {
  72                                 break;
  73                         }
  74                 } while (!m_oneShot);
  75
  76                 return NULL;
  77         }
  78
  79         sint32                  m_period;
  80         bool                    m_oneShot;
  81         wxEvtHandler*   m_owner;
  82         int                             m_id;
  83         wxSemaphore             m_sleepSemaphore;
  84 };
  85
  86
  87 ////////////////////// CTimer ////////////////////////
  88
  89 CTimer::~CTimer()
  90 {
  91         Stop();
  92 }
  93
  94
  95 CTimer::CTimer(wxEvtHandler* owner, int id)
  96 {
  97         wxASSERT(owner);
  98         m_owner = owner;
  99         m_id = id;
 100         m_thread = NULL;
 101 }
 102
 103
 104 bool CTimer::IsRunning() const
 105 {
 106         return (m_thread && m_thread->IsRunning());
 107 }
 108
 109
 110 bool CTimer::Start(int millisecs, bool oneShot)
 111 {
 112         wxCHECK_MSG(m_id != -1, false, wxT("Invalid target-ID for timer-events."));
 113
 114         // Since this class generally matches wxTimer, calling
 115         // start on a running timer stops and then restarts it.
 116         Stop();
 117
 118         m_thread = new CTimerThread();
 119         m_thread->m_period      = millisecs;
 120         m_thread->m_oneShot     = oneShot;
 121         m_thread->m_owner       = m_owner;
 122         m_thread->m_id          = m_id;
 123
 124         if (m_thread->Create() == wxTHREAD_NO_ERROR) {
 125                 if (m_thread->Run() == wxTHREAD_NO_ERROR) {
 126                         return true;
 127                 }
 128         }
 129
 130         // Something went wrong ...
 131         m_thread->Stop();
 132         delete m_thread;
 133         m_thread = NULL;
 134
 135         return false;
 136 }
 137
 138
 139 void CTimer::Stop()
 140 {
 141         if (m_thread) {
 142                 m_thread->m_sleepSemaphore.Post();
 143                 m_thread->Stop();
 144                 delete m_thread;
 145                 m_thread = NULL;
 146         }
 147 }
 148
 149
 150 DEFINE_LOCAL_EVENT_TYPE(MULE_EVT_TIMER)
 151
 152 CTimerEvent::CTimerEvent(int id)
 153         : wxEvent(id, MULE_EVT_TIMER)
 154 {
 155 }
 156
 157
 158 wxEvent* CTimerEvent::Clone() const
 159 {
 160         return new CTimerEvent(GetId());
 161 }
 162
 163 // File_checked_for_headers