channel_elem_base.cpp

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/* 
 *  channel_element_base.cpp - micros base channel element
 *  Copyright (C) 2015 Zaile Jiang
 *  
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *  
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
#include "micros_rtt/oro/channel_data_element.hpp"
#include "micros_rtt/oro/oro_arch.h"

namespace micros_rtt
{

ChannelElementBase::ChannelElementBase()
    : input(0)
{
  ORO_ATOMIC_SETUP(&refcount,0);
}

ChannelElementBase::~ChannelElementBase()
{
  ORO_ATOMIC_CLEANUP(&refcount);
}

ChannelElementBase::shared_ptr ChannelElementBase::getInput()
{ 
//  RTT::os::MutexLock lock(inout_lock);
  return ChannelElementBase::shared_ptr(input);
}

ChannelElementBase::shared_ptr ChannelElementBase::getOutput()
{ 
  //RTT::os::MutexLock lock(inout_lock);
  return ChannelElementBase::shared_ptr(output);
}

void ChannelElementBase::setOutput(shared_ptr output)
{
  this->output = output;
  if (output)
    output->input = this;
}

void ChannelElementBase::disconnect(bool forward)
{
  if (forward)
  {
    shared_ptr output = getOutput();
    if (output)
      output->disconnect(true);
  }
  else
  {
    shared_ptr input = getInput();
    if (input)
      input->disconnect(false);
  }

//  { RTT::os::MutexLock lock(inout_lock);
    this->input = 0;
    this->output = 0;
//  }
}

ChannelElementBase::shared_ptr ChannelElementBase::getInputEndPoint()
{
  shared_ptr input = getInput();
  return input ? input->getInputEndPoint() : this;
}
ChannelElementBase::shared_ptr ChannelElementBase::getOutputEndPoint()
{
  shared_ptr output = getOutput();
  return output ? output->getOutputEndPoint() : this;
}

bool ChannelElementBase::inputReady()
{
  // we go against the data stream
  shared_ptr input = getInput();
  if (input)
    return input->inputReady();
  return false;
}

void ChannelElementBase::clear()
{
  shared_ptr input = getInput();
  if (input)
    input->clear();
}

bool ChannelElementBase::signal()
{
  shared_ptr output = getOutput();
  if (output)
    return output->signal();
  return true;
}

void ChannelElementBase::ref()
{
  oro_atomic_inc(&refcount);
}

void ChannelElementBase::deref()
{
  if ( oro_atomic_dec_and_test(&refcount) ) delete this;
}

void intrusive_ptr_add_ref( ChannelElementBase* p )
{ p->ref(); }

void intrusive_ptr_release( ChannelElementBase* p )
{ p->deref(); }

}