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     sigset_t fProcessSignals;
  59
  60     static int fClientCount;
  61     static JackLibGlobals* fGlobals;
  62
  63     JackLibGlobals()
  64     {
  65         jack_log("JackLibGlobals");
  66         if (!JackMessageBuffer::Create()) {
  67             jack_error("Cannot create message buffer");
  68         }
  69         fGraphManager = -1;
  70         fEngineControl = -1;
  71
  72         // Filter SIGPIPE to avoid having client get a SIGPIPE when trying to access a died server.
  73     #ifdef WIN32
  74         // TODO
  75     #else
  76         sigset_t signals;
  77         sigemptyset(&signals);
  78         sigaddset(&signals, SIGPIPE);
  79         sigprocmask(SIG_BLOCK, &signals, &fProcessSignals);
  80     #endif
  81     }
  82
  83     ~JackLibGlobals()
  84     {
  85         jack_log("~JackLibGlobals");
  86         for (int i = 0; i < CLIENT_NUM; i++) {
  87             fSynchroTable[i].Disconnect();
  88         }
  89         JackMessageBuffer::Destroy();
  90
  91        // Restore old signal mask
  92     #ifdef WIN32
  93        // TODO
  94     #else
  95        sigprocmask(SIG_BLOCK, &fProcessSignals, 0);
  96     #endif
  97     }
  98
  99     static void Init()
 100     {
 101         if (!JackGlobals::fServerRunning && fClientCount > 0) {
 102
 103             // Cleanup remaining clients
 104             jack_error("Jack server was closed but clients are still allocated, cleanup...");
 105             for (int i = 0; i < CLIENT_NUM; i++) {
 106                 JackClient* client = JackGlobals::fClientTable[i];
 107                 if (client) {
 108                     jack_error("Cleanup client ref = %d", i);
 109                     client->Close();
 110                     delete client;
 111                     JackGlobals::fClientTable[CLIENT_NUM] = NULL;
 112                 }
 113             }
 114
 115             // Cleanup global context
 116             fClientCount = 0;
 117             delete fGlobals;
 118             fGlobals = NULL;
 119         }
 120
 121         if (fClientCount++ == 0 && !fGlobals) {
 122             jack_log("JackLibGlobals Init %x", fGlobals);
 123             InitTime();
 124             fGlobals = new JackLibGlobals();
 125         }
 126     }
 127
 128     static void Destroy()
 129     {
 130         if (--fClientCount == 0 && fGlobals) {
 131             jack_log("JackLibGlobals Destroy %x", fGlobals);
 132             EndTime();
 133             delete fGlobals;
 134             fGlobals = NULL;
 135         }
 136     }
 137
 138 };
 139
 140 } // end of namespace
 141
 142 #endif
 143