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
  25 namespace Jack
  26 {
  27
  28 int JackWinNamedPipeServerNotifyChannel::Open(const char* server_name)
  29 {
  30     if (fRequestPipe.Connect(jack_server_dir, server_name, 0) < 0) {
  31         jack_error("Cannot connect to server pipe");
  32         return -1;
  33     } else {
  34         return 0;
  35     }
  36 }
  37
  38 void JackWinNamedPipeServerNotifyChannel::Close()
  39 {
  40     fRequestPipe.Close();
  41 }
  42
  43 /*
  44 The requirement is that the Notification from RT thread can be delivered... not sure using a pipe is adequate here...
  45 Can the write operation block?
  46 A non blocking write operation shoud be used : check if write can succeed, and ignore the notification otherwise
  47 (since its mainly used for XRun, ignoring a notification is OK, successive XRun will come...)
  48 */
  49 void JackWinNamedPipeServerNotifyChannel::Notify(int refnum, int notify, int value)
  50 {
  51     JackClientNotificationRequest req(refnum, notify, value);
  52     if (req.Write(&fRequestPipe) < 0) {
  53         jack_error("Could not write request ref = %ld notify = %ld", refnum, notify);
  54     }
  55 }
  56
  57 } // end of namespace
  58
  59