// -*- C++ -*-

// ===================================================================
/**
 *  @file   TSS_Resources.h
 *
 *  $Id$
 *
 *  @author DOC Group - ISIS at Vanderbilt University
 *  @author DOC Center - Washington University at St. Louis
 *  @author DOC Laboratory - University of California at Irvine
 */
// ===================================================================

#ifndef TAO_TAO_TSS_RESOURCES_H
#define TAO_TAO_TSS_RESOURCES_H
#include /**/ "ace/pre.h"

#include "tao/Policy_Manager.h"


#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

#include "tao/TAO_Singleton.h"
#include "tao/Environment.h"


/**
 * @class TAO_TSS_Resources
 *
 * @brief The TSS resoures shared by all the ORBs
 *
 * This class is used by TAO to store the resources that are
 * thread-specific but are *not* ORB specific. The members are public
 * because only the ORB Core is expected to access them.
 */
class TAO_Export TAO_TSS_Resources
{
public:

  /// Constructor
  TAO_TSS_Resources (void);

  /// Destructor
  ~TAO_TSS_Resources (void);

private:

  /// Do not copy TSS resources
  //@{
  ACE_UNIMPLEMENTED_FUNC (TAO_TSS_Resources(const TAO_TSS_Resources&))
  ACE_UNIMPLEMENTED_FUNC (void operator=(const TAO_TSS_Resources&))
  //@}

public:

  /**
   * Points to structure containing state for the current upcall
   * context in this thread.  Note that it does not come from the
   * resource factory because it must always be held in
   * thread-specific storage.  For now, since TAO_ORB_Core instances
   * are TSS singletons, we simply ride along and don't allocate
   * occupy another TSS slot since there are some platforms where
   * those are precious commodities (e.g., NT).
   */
  void * poa_current_impl_;

  void * rtscheduler_current_impl_;

  void * rtscheduler_previous_current_impl_;

  /// The default environment for the thread.
  CORBA::Environment * default_environment_;

  /// If the user (or library) provides no environment the ORB_Core
  /// still holds one.
  CORBA::Environment tss_environment_;

#if (TAO_HAS_CORBA_MESSAGING == 1)

  /// The initial PolicyCurrent for this thread. Should be a TSS
  /// resource.
  TAO_Policy_Current_Impl initial_policy_current_;

  /// This pointer is reset by the POA on each upcall.
  TAO_Policy_Current_Impl * policy_current_;

#endif /* TAO_HAS_CORBA_MESSAGING == 1 */

};

/**
 * @todo TAO_TSS_RESOURCES singleton typedef should go away.
 */
typedef TAO_TSS_Singleton<TAO_TSS_Resources, TAO_SYNCH_MUTEX>
        TAO_TSS_RESOURCES;

TAO_SINGLETON_DECLARE (TAO_TSS_Singleton,
                       TAO_TSS_Resources,
                       TAO_SYNCH_MUTEX)


#include /**/ "ace/post.h"

#endif /* TAO_TSS_RESOURCES_H */