C++ CallbackQueue::begin方法代码示例

  void RetardedAsyncCallbackHandler::makePendingCalls()
  {
    XBMC_TRACE;
    CSingleLock lock(critSection);
    CallbackQueue::iterator iter = g_callQueue.begin();
    while (iter != g_callQueue.end())
    {
      AddonClass::Ref<AsyncCallbackMessage> p(*iter);

      // only call when we are in the right thread state
      if(p->handler->isStateOk(p->cb->getObject()))
      {
        // remove it from the queue. No matter what we're done with
        //  this. Even if it doesn't execute for some reason.
        g_callQueue.erase(iter);

        // we need to release the critSection lock prior to grabbing the
        //  lock on the object. Not doing so results in deadlocks. We no
        //  longer are accessing the g_callQueue so it's fine to do this now
        {
          XBMCAddonUtils::InvertSingleLockGuard unlock(lock);

          // make sure the object is not deallocating

          // we need to grab the object lock to see if the object of the call 
          //  is deallocating. holding this lock should prevent it from 
          //  deallocating during the execution of this call.
#ifdef ENABLE_XBMC_TRACE_API
          CLog::Log(LOGDEBUG,"%sNEWADDON executing callback 0x%lx",_tg.getSpaces(),(long)(p->cb.get()));
#endif
          AddonClass* obj = (p->cb->getObject());
          AddonClass::Ref<AddonClass> ref(obj);
          CSingleLock lock2(*obj);
          if (!p->cb->getObject()->isDeallocating())
          {
            try
            {
              // need to make the call
              p->cb->executeCallback();
            }
            catch (XbmcCommons::Exception& e) { e.LogThrowMessage(); }
            catch (...)
            {
              CLog::Log(LOGERROR,"Unknown exception while executing callback 0x%lx", (long)(p->cb.get()));
            }
          }
        }

        // since the state of the iterator may have been corrupted by
        //  the changing state of the list from another thread during
        //  the releasing fo the lock in the immediately preceeding 
        //  codeblock, we need to reset it before continuing the loop
        iter = g_callQueue.begin();
      }
      else // if we're not in the right thread for this callback...
        ++iter;
    }  
  }

  RetardedAsynchCallbackHandler::~RetardedAsynchCallbackHandler()
  {
    TRACE;
    CSingleLock lock(critSection);

    // find any messages that might be there because of me ... and remove them
    CallbackQueue::iterator iter = g_callQueue.begin();
    while (iter != g_callQueue.end())
    {
      AddonClass::Ref<AsynchCallbackMessage> cur(*iter);
      {
        if (cur->handler == this) // then this message is because of me
        {
          g_callQueue.erase(iter);
          iter = g_callQueue.begin();
        }
        else
          ++iter;
      }
    }
  }

  void RetardedAsynchCallbackHandler::clearPendingCalls(void* userData)
  {
    TRACE;
    CSingleLock lock(critSection);
    CallbackQueue::iterator iter = g_callQueue.begin();
    while (iter != g_callQueue.end())
    {
      AddonClass::Ref<AsynchCallbackMessage> p(*iter);

      if(p->handler->shouldRemoveCallback(userData))
      {
        CLog::Log(LOGDEBUG,"NEWADDON removing callback 0x%lx for PyThreadState 0x%lx from queue", (long)(p->cb.get()) ,(long)userData);
        g_callQueue.erase(iter);
      }
      else
        iter++;
    }  
  }

  void RetardedAsynchCallbackHandler::clearPendingCalls(void* userData)
  {
    TRACE;
    CSingleLock lock(critSection);
    CallbackQueue::iterator iter = g_callQueue.begin();
    while (iter != g_callQueue.end())
    {
      AddonClass::Ref<AsynchCallbackMessage> p(*iter);

      if(p->handler->shouldRemoveCallback(p->cb->getObject(),userData))
      {
#ifdef ENABLE_TRACE_API
        CLog::Log(LOGDEBUG,"%sNEWADDON removing callback 0x%lx for PyThreadState 0x%lx from queue", _tg.getSpaces(),(long)(p->cb.get()) ,(long)userData);
#endif
        iter = g_callQueue.erase(iter);
      }
      else
        ++iter;
    }
  }