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 namespace Jack
  36 {
  37
  38 class JackClient;
  39
  40 /*!
  41 \brief Global library static structure: singleton kind of pattern.
  42 */
  43
  44 struct JackLibGlobals
  45 {
  46     JackShmReadWritePtr<JackGraphManager> fGraphManager;        /*! Shared memory Port manager */
  47     JackShmReadWritePtr<JackEngineControl> fEngineControl;      /*! Shared engine control */  // transport engine has to be writable
  48     JackSynchro fSynchroTable[CLIENT_NUM];                  /*! Shared synchro table */
  49     sigset_t fProcessSignals;
  50
  51     static int fClientCount;
  52     static JackLibGlobals* fGlobals;
  53
  54     JackLibGlobals()
  55     {
  56         jack_log("JackLibGlobals");
  57         JackMessageBuffer::Create();
  58         fGraphManager = -1;
  59         fEngineControl = -1;
  60
  61         // Filter SIGPIPE to avoid having client get a SIGPIPE when trying to access a died server.
  62     #ifdef WIN32
  63         // TODO
  64     #else
  65         sigset_t signals;
  66         sigemptyset(&signals);
  67         sigaddset(&signals, SIGPIPE);
  68         sigprocmask(SIG_BLOCK, &signals, &fProcessSignals);
  69     #endif
  70     }
  71
  72     ~JackLibGlobals()
  73     {
  74         jack_log("~JackLibGlobals");
  75         for (int i = 0; i < CLIENT_NUM; i++) {
  76             fSynchroTable[i].Disconnect();
  77         }
  78         JackMessageBuffer::Destroy();
  79
  80        // Restore old signal mask
  81     #ifdef WIN32
  82        // TODO
  83     #else
  84        sigprocmask(SIG_BLOCK, &fProcessSignals, 0);
  85     #endif
  86     }
  87
  88     static void Init()
  89     {
  90         if (!JackGlobals::fServerRunning && fClientCount > 0) {
  91
  92             // Cleanup remaining clients
  93             jack_error("Jack server was closed but clients are still allocated, cleanup...");
  94             for (int i = 0; i < CLIENT_NUM; i++) {
  95                 JackClient* client = JackGlobals::fClientTable[i];
  96                 if (client) {
  97                     jack_error("Cleanup client ref = %d", i);
  98                     client->Close();
  99                     delete client;
 100                     JackGlobals::fClientTable[CLIENT_NUM] = NULL;
 101                 }
 102             }
 103
 104             // Cleanup global context
 105             fClientCount = 0;
 106             delete fGlobals;
 107             fGlobals = NULL;
 108         }
 109
 110         if (fClientCount++ == 0 && !fGlobals) {
 111             jack_log("JackLibGlobals Init %x", fGlobals);
 112             InitTime();
 113             fGlobals = new JackLibGlobals();
 114         }
 115     }
 116
 117     static void Destroy()
 118     {
 119         if (--fClientCount == 0 && fGlobals) {
 120             jack_log("JackLibGlobals Destroy %x", fGlobals);
 121             delete fGlobals;
 122             fGlobals = NULL;
 123         }
 124     }
 125
 126     static void CheckContext()
 127     {
 128         if (!(fClientCount > 0 && fGlobals)) {
 129             jack_error("Error !!! : client accessing an already desallocated library context");
 130         }
 131     }
 132
 133 };
 134
 135 } // end of namespace
 136
 137 #endif
 138