common/JackLibGlobals.h

   1 /*
   2 Copyright (C) 2005 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 #ifndef __JackLibGlobals__
  21 #define __JackLibGlobals__
  22
  23 #include "JackShmMem.h"
  24 #include "JackEngineControl.h"
  25 #include "JackGlobals.h"
  26 #include "JackPlatformPlug.h"
  27 #include "JackGraphManager.h"
  28 #include "JackMessageBuffer.h"
  29 #include "JackTime.h"
  30 #include "JackClient.h"
  31 #include "JackError.h"
  32 #include <assert.h>
  33 #include <signal.h>
  34
  35 #ifdef WIN32
  36 #ifdef __MINGW32__
  37 #include <sys/types.h>
  38 typedef _sigset_t sigset_t;
  39 #else
  40 typedef HANDLE sigset_t;
  41 #endif
  42 #endif
  43
  44 namespace Jack
  45 {
  46
  47 class JackClient;
  48
  49 /*!
  50 \brief Global library static structure: singleton kind of pattern.
  51 */
  52
  53 struct JackLibGlobals
  54 {
  55     JackShmReadWritePtr<JackGraphManager> fGraphManager;        /*! Shared memory Port manager */
  56     JackShmReadWritePtr<JackEngineControl> fEngineControl;      /*! Shared engine control */  // transport engine has to be writable
  57     JackSynchro fSynchroTable[CLIENT_NUM];                  /*! Shared synchro table */
  58     JackMetadata *fMetadata;                                /*! Shared metadata base */
  59     sigset_t fProcessSignals;
  60
  61     static int fClientCount;
  62     static JackLibGlobals* fGlobals;
  63
  64     JackLibGlobals()
  65     {
  66         jack_log("JackLibGlobals");
  67         if (!JackMessageBuffer::Create()) {
  68             jack_error("Cannot create message buffer");
  69         }
  70         fGraphManager = -1;
  71         fEngineControl = -1;
  72
  73         fMetadata = new JackMetadata(false);
  74
  75         // Filter SIGPIPE to avoid having client get a SIGPIPE when trying to access a died server.
  76     #ifdef WIN32
  77         // TODO
  78     #else
  79         sigset_t signals;
  80         sigemptyset(&signals);
  81         sigaddset(&signals, SIGPIPE);
  82         sigprocmask(SIG_BLOCK, &signals, &fProcessSignals);
  83     #endif
  84     }
  85
  86     ~JackLibGlobals()
  87     {
  88         jack_log("~JackLibGlobals");
  89         for (int i = 0; i < CLIENT_NUM; i++) {
  90             fSynchroTable[i].Disconnect();
  91         }
  92         JackMessageBuffer::Destroy();
  93
  94         delete fMetadata;
  95         fMetadata = NULL;
  96
  97        // Restore old signal mask
  98     #ifdef WIN32
  99        // TODO
 100     #else
 101        sigprocmask(SIG_BLOCK, &fProcessSignals, 0);
 102     #endif
 103     }
 104
 105     static void Init()
 106     {
 107         if (!JackGlobals::fServerRunning && fClientCount > 0) {
 108
 109             // Cleanup remaining clients
 110             jack_error("Jack server was closed but clients are still allocated, cleanup...");
 111             for (int i = 0; i < CLIENT_NUM; i++) {
 112                 JackClient* client = JackGlobals::fClientTable[i];
 113                 if (client) {
 114                     jack_error("Cleanup client ref = %d", i);
 115                     client->Close();
 116                     delete client;
 117                 }
 118             }
 119
 120             // Cleanup global context
 121             fClientCount = 0;
 122             delete fGlobals;
 123             fGlobals = NULL;
 124         }
 125
 126         if (fClientCount++ == 0 && !fGlobals) {
 127             jack_log("JackLibGlobals Init %x", fGlobals);
 128             InitTime();
 129             fGlobals = new JackLibGlobals();
 130         }
 131     }
 132
 133     static void Destroy()
 134     {
 135         if (--fClientCount == 0 && fGlobals) {
 136             jack_log("JackLibGlobals Destroy %x", fGlobals);
 137             EndTime();
 138             delete fGlobals;
 139             fGlobals = NULL;
 140         }
 141     }
 142
 143 };
 144
 145 } // end of namespace
 146
 147 #endif
 148