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// -*- C++ -*-
//=============================================================================
/**
* @file Thread_Exit.h
*
* $Id$
*
* @author Carlos O'Ryan <coryan@uci.edu>
*/
//=============================================================================
#ifndef ACE_THREAD_EXIT_H
#define ACE_THREAD_EXIT_H
#include /**/ "ace/pre.h"
#include "ace/config-all.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Thread_Control.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class ACE_Thread_Exit
*
* @brief Keep exit information for a Thread in thread specific storage.
* so that the thread-specific exit hooks will get called no
* matter how the thread exits (e.g., via <ACE_Thread::exit>, C++
* or Win32 exception, "falling off the end" of the thread entry
* point function, etc.).
*
* This clever little helper class is stored in thread-specific
* storage using the <ACE_TSS> wrapper. When a thread exits the
* <ACE_TSS::cleanup> function deletes this object, thereby
* closing it down gracefully.
*/
class ACE_Export ACE_Thread_Exit
{
public:
/// Capture the Thread that will be cleaned up automatically.
ACE_Thread_Exit (void);
/// Set the <ACE_Thread_Manager>.
void thr_mgr (ACE_Thread_Manager *tm);
/// Destructor calls the thread-specific exit hooks when a thread
/// exits.
~ACE_Thread_Exit (void);
/// Singleton access point.
static ACE_Thread_Exit *instance (void);
/// Cleanup method, used by the <ACE_Object_Manager> to destroy the
/// singleton.
static void cleanup (void *instance);
private:
/// Automatically add/remove the thread from the
/// <ACE_Thread_Manager>.
ACE_Thread_Control thread_control_;
/**
* Used to detect whether we should create a new instance (or not)
* within the instance method -- we don't trust the instance_ ptr
* because the destructor may have run (if ACE::fini() was called).
* See bug #526.
* We don't follow the singleton pattern due to dependency issues.
*/
static unsigned int is_constructed_;
};
/**
* @class ACE_Thread_Exit_Maybe
*
* @brief A version of ACE_Thread_Exit that is created dynamically
* under the hood if the flag is set to TRUE.
*
* Allows the appearance of a "smart pointer", but is not
* always created.
*/
class ACE_Export ACE_Thread_Exit_Maybe
{
public:
/// Don't create an ACE_Thread_Exit instance by default.
ACE_Thread_Exit_Maybe (int flag = 0);
/// Destroys the underlying ACE_Thread_Exit instance if it exists.
~ACE_Thread_Exit_Maybe (void);
/// Delegates to underlying instance.
ACE_Thread_Exit * operator -> (void) const;
/// Returns the underlying instance.
ACE_Thread_Exit * instance (void) const;
private:
/// Holds the underlying instance.
ACE_Thread_Exit *instance_;
};
ACE_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /* ACE_THREAD_EXIT_H */
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