common/JackLibClient.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 "JackLibClient.h"
  21 #include "JackTime.h"
  22 #include "JackLibGlobals.h"
  23 #include "JackGlobals.h"
  24 #include "JackPlatformPlug.h"
  25 #include "JackTools.h"
  26
  27 namespace Jack
  28 {
  29
  30 // Used for external C API (JackAPI.cpp)
  31 JackGraphManager* GetGraphManager()
  32 {
  33     if (JackLibGlobals::fGlobals) {
  34         return JackLibGlobals::fGlobals->fGraphManager;
  35     } else {
  36         return NULL;
  37     }
  38 }
  39
  40 JackEngineControl* GetEngineControl()
  41 {
  42     if (JackLibGlobals::fGlobals) {
  43         return JackLibGlobals::fGlobals->fEngineControl;
  44     } else {
  45         return NULL;
  46     }
  47 }
  48
  49 JackSynchro* GetSynchroTable()
  50 {
  51     return (JackLibGlobals::fGlobals ? JackLibGlobals::fGlobals->fSynchroTable : 0);
  52 }
  53
  54 //-------------------
  55 // Client management
  56 //-------------------
  57
  58 /*
  59 ShutDown is called:
  60 - from the RT thread when Execute method fails
  61 - possibly from a "closed" notification channel
  62 (Not needed since the synch object used (Sema of Fifo will fails when server quits... see ShutDown))
  63 */
  64
  65 void JackLibClient::ShutDown()
  66 {
  67     jack_log("JackLibClient::ShutDown");
  68     JackGlobals::fServerRunning = false;
  69     JackClient::ShutDown();
  70 }
  71
  72 JackLibClient::JackLibClient(JackSynchro* table): JackClient(table)
  73 {
  74     jack_log("JackLibClient::JackLibClient table = %x", table);
  75     fChannel = new JackClientChannel();
  76 }
  77
  78 JackLibClient::~JackLibClient()
  79 {
  80     jack_log("JackLibClient::~JackLibClient");
  81     delete fChannel;
  82 }
  83
  84 int JackLibClient::Open(const char* server_name, const char* name, int uuid, jack_options_t options, jack_status_t* status)
  85 {
  86     int shared_engine, shared_client, shared_graph, result;
  87     jack_log("JackLibClient::Open name = %s", name);
  88
  89     strncpy(fServerName, server_name, sizeof(fServerName));
  90
  91     // Open server/client channel
  92     char name_res[JACK_CLIENT_NAME_SIZE + 1];
  93     if (fChannel->Open(server_name, name, uuid, name_res, this, options, status) < 0) {
  94         jack_error("Cannot connect to the server");
  95         goto error;
  96     }
  97
  98     // Start receiving notifications
  99     if (fChannel->Start() < 0) {
 100         jack_error("Cannot start channel");
 101         goto error;
 102     }
 103
 104     // Require new client
 105     fChannel->ClientOpen(name_res, JackTools::GetPID(), uuid, &shared_engine, &shared_client, &shared_graph, &result);
 106     if (result < 0) {
 107         jack_error("Cannot open %s client", name_res);
 108         goto error;
 109     }
 110
 111     try {
 112         // Map shared memory segments
 113         JackLibGlobals::fGlobals->fEngineControl.SetShmIndex(shared_engine, fServerName);
 114         JackLibGlobals::fGlobals->fGraphManager.SetShmIndex(shared_graph, fServerName);
 115         fClientControl.SetShmIndex(shared_client, fServerName);
 116         JackGlobals::fVerbose = GetEngineControl()->fVerbose;
 117     } catch (...) {
 118         jack_error("Map shared memory segments exception");
 119         goto error;
 120     }
 121
 122     SetupDriverSync(false);
 123
 124     // Connect shared synchro : the synchro must be usable in I/O mode when several clients live in the same process
 125     if (!fSynchroTable[GetClientControl()->fRefNum].Connect(name_res, fServerName)) {
 126         jack_error("Cannot ConnectSemaphore %s client", name_res);
 127         goto error;
 128     }
 129
 130     JackGlobals::fClientTable[GetClientControl()->fRefNum] = this;
 131     JackGlobals::fServerRunning = true;
 132     SetClockSource(GetEngineControl()->fClockSource);
 133     jack_log("JackLibClient::Open name = %s refnum = %ld", name_res, GetClientControl()->fRefNum);
 134     return 0;
 135
 136 error:
 137     fChannel->Stop();
 138     fChannel->Close();
 139     return -1;
 140 }
 141
 142 // Notifications received from the server
 143 // TODO this should be done once for all clients in the process, when a shared notification channel
 144 // will be shared by all clients...
 145 int JackLibClient::ClientNotifyImp(int refnum, const char* name, int notify, int sync, const char* message, int value1, int value2)
 146 {
 147     int res = 0;
 148
 149     // Done all time
 150     switch (notify) {
 151
 152         case kAddClient:
 153             jack_log("JackClient::AddClient name = %s, ref = %ld ", name, refnum);
 154             // the synchro must be usable in I/O mode when several clients live in the same process
 155             res = fSynchroTable[refnum].Connect(name, fServerName) ? 0 : -1;
 156             break;
 157
 158         case kRemoveClient:
 159             jack_log("JackClient::RemoveClient name = %s, ref = %ld ", name, refnum);
 160             if (GetClientControl() && strcmp(GetClientControl()->fName, name) != 0)
 161                 res = fSynchroTable[refnum].Disconnect() ? 0 : -1;
 162             break;
 163     }
 164
 165     return res;
 166 }
 167
 168 JackGraphManager* JackLibClient::GetGraphManager() const
 169 {
 170     assert(JackLibGlobals::fGlobals->fGraphManager);
 171     return JackLibGlobals::fGlobals->fGraphManager;
 172 }
 173
 174 JackEngineControl* JackLibClient::GetEngineControl() const
 175 {
 176     assert(JackLibGlobals::fGlobals->fEngineControl);
 177     return JackLibGlobals::fGlobals->fEngineControl;
 178 }
 179
 180 JackClientControl* JackLibClient::GetClientControl() const
 181 {
 182     return fClientControl;
 183 }
 184
 185 } // end of namespace
 186
 187
 188