Scale Stack 0.3 Developer Documentation

scalestack/threading/thread.h

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/*
 * Scale Stack
 *
 * Copyright 2010 Eric Day
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef SCALESTACK_THREADING_THREAD_H
#define SCALESTACK_THREADING_THREAD_H

#include <exception>
#include <memory>

#include <scalestack/kernel/core.h>
#include <scalestack/kernel/module.h>
#include <scalestack/threading/service.h>

namespace scalestack
{
namespace threading
{

class thread_provider;

class thread
{
public:

  thread(kernel::module& module);

  virtual ~thread();

  void start(void);

  void stop(void);

  size_t get_id(void);

  virtual void run(void) = 0;

protected:

  kernel::module& _module;

private:

  thread(const thread&);

  thread& operator=(const thread&);

  std::auto_ptr<thread_provider> _thread_provider;
};

class thread_provider
{
public:

  thread_provider(kernel::module& module, thread& thread);

  virtual ~thread_provider();

  virtual void start(void) = 0;

  virtual void stop(void) = 0;

  virtual size_t get_id(void) = 0;

  virtual void run(void);

protected:

  kernel::module& _module;

private:

  thread_provider(const thread_provider&);

  thread_provider& operator=(const thread_provider&);

  thread& _thread;
};

/*
 * Public thread methods.
 */

inline thread::thread(kernel::module& module):
  _module(module),
  _thread_provider(static_cast<threading::service&>(
    module.get_core().get_service("threading"))._add_thread(*this))
{
}

inline thread::~thread()
{
}

inline void thread::start(void)
{
  _thread_provider->start();
}

inline void thread::stop(void)
{
  _thread_provider->stop();
}

inline size_t thread::get_id(void)
{
  return _thread_provider->get_id();
}

/*
 * Public thread_provider methods.
 */

inline thread_provider::thread_provider(kernel::module& module, thread& thread):
  _module(module),
  _thread(thread)
{
}

inline thread_provider::~thread_provider()
{
}

inline void thread_provider::run(void)
{
  /*
   * Catch any exceptions here and notify the coer to shutdown. Otherwise the
   * exception could cause the process to exit without cleanly shutting down.
   */
  try
  {
    _thread.run();
  }
  catch (std::exception&)
  {
    _module.get_core().shutdown();
  }
}

} /* namespace threading */
} /* namespace scalestack */

#endif /* SCALESTACK_THREADING_THREAD_H */

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