windows/JackWinNamedPipeServerNotifyChannel.cpp

   1 /*
   2 Copyright (C) 2004-2006 Grame
   3
   4 This program is free software; you can redistribute it and/or modify
   5   it under the terms of the GNU General Public License as published by
   6   the Free Software Foundation; either version 2 of the License, or
   7   (at your option) any later version.
   8
   9   This program is distributed in the hope that it will be useful,
  10   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12   GNU General Public License for more details.
  13
  14   You should have received a copy of the GNU General Public License
  15   along with this program; if not, write to the Free Software
  16   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include "JackWinNamedPipeServerNotifyChannel.h"
  21 #include "JackError.h"
  22 #include "JackRequest.h"
  23 #include "JackConstants.h"
  24 #include "JackNotification.h"
  25
  26 namespace Jack
  27 {
  28
  29 int JackWinNamedPipeServerNotifyChannel::Open(const char* server_name)
  30 {
  31     if (fRequestPipe.Connect(jack_server_dir, server_name, 0) < 0) {
  32         jack_error("Cannot connect to server pipe");
  33         return -1;
  34     } else {
  35         return 0;
  36     }
  37 }
  38
  39 void JackWinNamedPipeServerNotifyChannel::Close()
  40 {
  41     fRequestPipe.Close();
  42 }
  43
  44 /*
  45 The requirement is that the Notification from RT thread can be delivered... not sure using a pipe is adequate here...
  46 Can the write operation block?
  47 A non blocking write operation should be used : check if write can succeed, and ignore the notification otherwise
  48 (since its mainly used for XRun, ignoring a notification is OK, successive XRun will come...)
  49 */
  50 void JackWinNamedPipeServerNotifyChannel::Notify(int refnum, int notify, int value)
  51 {
  52     JackClientNotificationRequest req(refnum, notify, value);
  53     if (req.Write(&fRequestPipe) < 0) {
  54         jack_error("Could not write notification ref = %d notify = %d", refnum, notify);
  55     }
  56 }
  57
  58 void JackWinNamedPipeServerNotifyChannel::NotifyQuit()
  59 {
  60     Notify(-1, kQUIT, 0);
  61 }
  62
  63 } // end of namespace
  64
  65