C++ CBOINCBaseFrame::AddPendingEvent方法代码示例

//.........这里部分代码省略.........
                // process events so user can maximize the manager. 
                //
                // NOTE: CBOINCGUIApp::FilterEvent() discards those events 
                // which might cause posting of more RPC requests while 
                // we are in this loop, to prevent undesirable recursion.
                // Since the manager is minimized, we don't have to worry about 
                // discarding crucial drawing or command events. 
                // The filter does allow the the Open Manager menu item from 
                // the system tray icon and wxEVT_RPC_FINISHED event. 
                //
                timeToSleep = DELAY_WHEN_MINIMIZED; // Allow user to maximize Manager
                wxSafeYield(NULL, true);
            }
            
            // OnRPCComplete() clears m_bWaitingForRPC if RPC completed 
            if (! m_bWaitingForRPC) {
                return retval;
            }
            
            mutexErr = m_pRPC_Request_Mutex->Lock();
            wxASSERT(mutexErr == wxMUTEX_NO_ERROR);

            // Simulate handling of CRPCFinishedEvent but don't allow any other 
            // events (so no user activity) to prevent undesirable recursion.
            // Since we don't need to filter and discard events, they remain on 
            // the queue until it is safe to process them.
            // Allow RPC thread to run while we wait for it.
            if (!current_rpc_request.isActive) {
                mutexErr = m_pRPC_Request_Mutex->Unlock();
                wxASSERT(mutexErr == wxMUTEX_NO_ERROR);
                
                HandleCompletedRPC();
                continue;
            }

            // Wait for RPC thread to wake us
            // This does the following:
            // (1) Unlocks the Mutex and puts the main thread to sleep as an atomic operation.
            // (2) On Signal from RPC thread: locks Mutex again and wakes the main thread.
            m_pRPC_Request_Condition->WaitTimeout(timeToSleep);

            mutexErr = m_pRPC_Request_Mutex->Unlock();
            wxASSERT(mutexErr == wxMUTEX_NO_ERROR);
        }
        
        // Demand RPC has taken longer than RPC_WAIT_DLG_DELAY seconds and 
        // Manager is not minimized, so display the "Please Wait" dialog 
        // with a Cancel button.  If the RPC does complete while the dialog 
        // is up, HandleCompletedRPC() will call EndModal with wxID_OK.
        //
        // NOTE: the Modal dialog permits processing of all events, but 
        // CBOINCGUIApp::FilterEvent() blocks those events which might cause 
        // posting of more RPC requests while in this dialog, to prevent 
        // undesirable recursion.
        //
        if (m_RPCWaitDlg) {
            response = m_RPCWaitDlg->ShowModal();
            // Remember time the dialog was closed for use by RunPeriodicRPCs()
            m_dtLasAsyncRPCDlgTime = wxDateTime::Now();
            if (response != wxID_OK) {
                // TODO: If user presses Cancel in Please Wait dialog but request 
                // has not yet been started, should we just remove it from queue? 
                // If we make that change, should we also add a separate menu item  
                // to reset the RPC connection (or does one already exist)?

                retval = -1;
                // If the RPC continues to get data after we return to 
                // our caller, it may try to write into a buffer or struct
                // which the caller has already deleted.  To prevent this, 
                // we close the socket (disconnect) and kill the RPC thread.
                // This is ugly but necessary.  We must then reconnect and 
                // start a new RPC thread.
                if (current_rpc_request.isActive) {
                    current_rpc_request.isActive = false;
                    rpcClient.close();
                    RPC_requests.clear();
                    current_rpc_request.clear();
                    m_bNeedRefresh = false;
                    m_bNeedTaskBarRefresh = false;

                    // We will be reconnected to the same client (if possible) by 
                    // CBOINCDialUpManager::OnPoll() and CNetworkConnection::Poll().
                    m_pNetworkConnection->SetStateDisconnected();
                }
                if (response == wxID_EXIT) {
                    pFrame = wxGetApp().GetFrame();
                    wxCommandEvent evt(wxEVT_COMMAND_MENU_SELECTED, wxID_EXIT);
                    s_bSkipExitConfirmation = true;
                    pFrame->AddPendingEvent(evt);
                }
            }
            if (m_RPCWaitDlg) {
                m_RPCWaitDlg->Destroy();
            }
            m_RPCWaitDlg = NULL;
            m_bWaitingForRPC = false;
        }
    }
    return retval;
}