posix/JackSocketServerNotifyChannel.cpp

   1 /*
   2 Copyright (C) 2004-2008 Grame
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU Lesser General Public License as published by
   6 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  13
  14 You should have received a copy of the GNU Lesser General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17
  18 */
  19
  20 #include "JackSocketServerNotifyChannel.h"
  21 #include "JackError.h"
  22 #include "JackRequest.h"
  23 #include "JackConstants.h"
  24 #include "JackNotification.h"
  25 #include "JackServerGlobals.h"
  26
  27 namespace Jack
  28 {
  29
  30 int JackSocketServerNotifyChannel::Open(const char* server_name)
  31 {
  32     if (fRequestSocket.Connect(jack_server_dir, server_name, 0) < 0) {
  33         jack_error("Cannot connect to server socket");
  34         return -1;
  35     } else {
  36         fRequestSocket.SetNonBlocking(true);
  37         JackServerGlobals::fRTNotificationSocket = fRequestSocket.GetFd();
  38         return 0;
  39     }
  40 }
  41
  42 void JackSocketServerNotifyChannel::Close()
  43 {
  44     fRequestSocket.Close();
  45 }
  46
  47 /*
  48 The requirement is that the Notification from RT thread can be delivered... not sure using a socket is adequate here...
  49 Can the write operation block?
  50 A non blocking write operation shoud be used : check if write can succeed, and ignore the notification otherwise
  51 (since its mainly used for XRun, ignoring a notification is OK, successive XRun will come...)
  52 */
  53 void JackSocketServerNotifyChannel::Notify(int refnum, int notify, int value)
  54 {
  55     JackClientNotificationRequest req(refnum, notify, value);
  56     if (req.Write(&fRequestSocket) < 0) {
  57         jack_error("Could not write notification ref = %d notify = %d", refnum, notify);
  58     }
  59 }
  60
  61 void JackSocketServerNotifyChannel::NotifyQuit()
  62 {
  63     Notify(-1, kQUIT, 0);
  64 }
  65
  66 } // end of namespace
  67
  68