C++ QSharedMemory::error方法代码示例

static mydsp *create_shared_dsp(){
  QString key = "radium_crashreporter_" + QString::number(QDateTime::currentMSecsSinceEpoch());
  QSharedMemory *shared = new QSharedMemory(key);

  if(shared->create(sizeof(mydsp))==false){
    fprintf(stderr,"COMPRESSOR_create_shared: Couldn't create... Error: %s\n",shared->error()==QSharedMemory::NoError?"No error (?)":shared->errorString().toAscii().data());
    return NULL;
  }

  void *memory = shared->data();

  mydsp *dsp = new(memory) mydsp();

#if 0
  printf("memory: %p, shared: %p\n",memory,shared);
  dsp->key = key;
  dsp->shared = shared;
#endif

  //printf("system: %d\n",system(QString(QString("xterm -e gdb /home/kjetil/radium_compressor/radium_compressor --args --ladspa-slave ")+key).toAscii()));
  printf("system: %d\n",system(QString(QString("xterm -e gdb --args /home/kjetil/radium_compressor/radium_compressor  --ladspa-slave ")+key+" &").toAscii()));


  return dsp;

#if 0
  if(fork()!=0){

    return dsp;

  }else{

    QSharedMemory *shared = new QSharedMemory(key);

    if(shared->attach()==false){
      fprintf(stderr,"Ladspa compressor: Couldn't attach... Error: %s\n",shared->error()==QSharedMemory::NoError?"No error (?)":shared->errorString().toAscii().data());
      exit(0);
    }

    char *argv[1]={(char*)"radium_compressor"};

    mydsp *dsp          = (mydsp*)shared->data();
    fprintf(stderr,"dsp: %p.\n",dsp);
    portData* port_data = new portData(dsp->getNumInputs(), dsp->getNumOutputs());
    dsp->buildUserInterface(port_data); // This is the second time buildUserInterface is called twice on the dsp data. One time in each process.

    start_program(1,argv,new PLUGIN(0, port_data, dsp));

    exit(0);
    return NULL;
  }
#endif
}

void *COMPRESSOR_create_ladspa(const char *key){
  QSharedMemory *shared = new QSharedMemory(key);
  
  if(shared->attach()==false){
    fprintf(stderr,"Ladspa compressor: Couldn't attach... Error: %s\n",shared->error()==QSharedMemory::NoError?"No error (?)":shared->errorString().toAscii().data());
    exit(0);
  }

  mydsp *dsp          = (mydsp*)shared->data();
  
  fprintf(stderr,"dsp: %p.\n",dsp);
  portData* port_data = new portData(dsp->mydsp::getNumInputs(), dsp->mydsp::getNumOutputs());
  dsp->mydsp::buildUserInterface(port_data); // buildUserInterface is called twice on the dsp data. One time in each process.
  
  return new PLUGIN(0, port_data, dsp);
}

void *COMPRESSOR_create_shared(float sample_rate){
  QString key = "radium_crashreporter_" + QString::number(QDateTime::currentMSecsSinceEpoch());
  QSharedMemory *shared = new QSharedMemory(key);
  if(shared->create(sizeof(Compressor_wrapper))==false){
    fprintf(stderr,"COMPRESSOR_create_shared: Couldn't create... Error: %s\n",shared->error()==QSharedMemory::NoError?"No error (?)":shared->errorString().toAscii().data());
    return NULL;
  }

  void *memory = shared->data();

  Compressor_wrapper *wrapper = new(memory) Compressor_wrapper(sample_rate);
  printf("memory: %p, shared: %p\n",memory,shared);
  wrapper->key = key;
  wrapper->shared = shared;
  
  return wrapper;
}

int producer()
{
    QSharedMemory producer;
    producer.setKey("market");

    int size = 1024;
    if (!producer.create(size)) {
        if (producer.error() == QSharedMemory::AlreadyExists) {
            if (!producer.attach()) {
                qWarning() << "Could not attach to" << producer.key();
                return EXIT_FAILURE;
            }
        } else {
            qWarning() << "Could not create" << producer.key();
            return EXIT_FAILURE;
        }
    }
    // tell parent we're ready
    //qDebug("producer created and attached");
    puts("");
    fflush(stdout);

    if (!producer.lock()) {
        qWarning() << "Could not lock" << producer.key();
        return EXIT_FAILURE;
    }
    set(producer, 0, 'Q');
    if (!producer.unlock()) {
        qWarning() << "Could not lock" << producer.key();
        return EXIT_FAILURE;
    }

    int i = 0;
    while (i < 5) {
        if (!producer.lock()) {
            qWarning() << "Could not lock" << producer.key();
            return EXIT_FAILURE;
        }
        if (get(producer, 0) == 'Q') {
            if (!producer.unlock()) {
                qWarning() << "Could not unlock" << producer.key();
                return EXIT_FAILURE;
            }
            QTest::qSleep(1);
            continue;
        }
        //qDebug() << "producer:" << i);
        ++i;
        set(producer, 0, 'Q');
        if (!producer.unlock()) {
            qWarning() << "Could not unlock" << producer.key();
            return EXIT_FAILURE;
        }
        QTest::qSleep(1);
    }
    if (!producer.lock()) {
        qWarning() << "Could not lock" << producer.key();
        return EXIT_FAILURE;
    }
    set(producer, 0, 'E');
    if (!producer.unlock()) {
        qWarning() << "Could not unlock" << producer.key();
        return EXIT_FAILURE;
    }

    //qDebug("producer done");

    // Sleep for a bit to let all consumers exit
    getchar();
    return EXIT_SUCCESS;
}