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 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 #ifndef __JackLibGlobals__
  21 #define __JackLibGlobals__
  22
  23 #include "JackShmMem.h"
  24 #include "JackEngineControl.h"
  25 #ifdef __APPLE__
  26 #include "JackMachPort.h"
  27 #include <map>
  28 #endif
  29 #include "JackGlobals.h"
  30 #include "JackTime.h"
  31 #include <assert.h>
  32
  33 namespace Jack
  34 {
  35
  36 class JackClient;
  37
  38 /*!
  39 \brief Global library static structure: singleton kind of pattern.
  40 */
  41
  42 struct JackLibGlobals
  43 {
  44     JackShmReadWritePtr<JackGraphManager> fGraphManager;        /*! Shared memory Port manager */
  45     JackShmReadWritePtr<JackEngineControl> fEngineControl;      /*! Shared engine control */  // transport engine has to be writable
  46     JackSynchro* fSynchroTable[CLIENT_NUM];                                     /*! Shared synchro table */
  47 #ifdef __APPLE__
  48     std::map<mach_port_t, JackClient*> fClientTable;        /*! Client table */
  49 #endif
  50
  51     static long fClientCount;
  52     static JackLibGlobals* fGlobals;
  53
  54     JackLibGlobals()
  55     {
  56         JackLog("JackLibGlobals\n");
  57         for (int i = 0; i < CLIENT_NUM; i++)
  58             fSynchroTable[i] = JackGlobals::MakeSynchro();
  59         fGraphManager = -1;
  60         fEngineControl = -1;
  61     }
  62
  63     virtual ~JackLibGlobals()
  64     {
  65         JackLog("~JackLibGlobals\n");
  66         for (int i = 0; i < CLIENT_NUM; i++) {
  67             fSynchroTable[i]->Disconnect();
  68             delete fSynchroTable[i];
  69         }
  70     }
  71
  72     static void Init()
  73     {
  74         if (fClientCount++ == 0 && !fGlobals) {
  75             JackLog("JackLibGlobals Init %x\n", fGlobals);
  76             JackGlobals::InitClient();
  77             InitTime();
  78             fGlobals = new JackLibGlobals();
  79            }
  80     }
  81
  82     static void Destroy()
  83     {
  84         if (--fClientCount == 0 && fGlobals) {
  85             JackLog("JackLibGlobals Destroy %x\n", fGlobals);
  86             delete fGlobals;
  87             fGlobals = NULL;
  88             JackGlobals::Destroy();
  89         }
  90     }
  91
  92         static void CheckContext()
  93         {
  94                 if (!(fClientCount > 0 && fGlobals))
  95                         jack_error("Error !!! : client accessing an already desallocated library context");
  96         }
  97
  98 };
  99
 100 } // end of namespace
 101
 102 #endif
 103