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Diffstat (limited to 'TAO/tao/TAO_Singleton.cpp')
| -rw-r--r-- | TAO/tao/TAO_Singleton.cpp | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/TAO/tao/TAO_Singleton.cpp b/TAO/tao/TAO_Singleton.cpp new file mode 100644 index 00000000000..dc8493856a9 --- /dev/null +++ b/TAO/tao/TAO_Singleton.cpp @@ -0,0 +1,209 @@ +// -*- C++ -*- +// +// $Id$ + +#ifndef TAO_SINGLETON_CPP +#define TAO_SINGLETON_CPP + +#include "tao/TAO_Singleton.h" + +#if !defined (ACE_LACKS_PRAGMA_ONCE) +# pragma once +#endif /* ACE_LACKS_PRAGMA_ONCE */ + +#include "tao/TAO_Singleton_Manager.h" + +#include "ace/Guard_T.h" +#include "ace/Object_Manager.h" +#include "ace/Log_Msg.h" + +#if !defined (__ACE_INLINE__) +#include "tao/TAO_Singleton.inl" +#endif /* __ACE_INLINE__ */ + +TAO_BEGIN_VERSIONED_NAMESPACE_DECL + +template <class TYPE, class ACE_LOCK> void +TAO_Singleton<TYPE, ACE_LOCK>::dump (void) +{ + ACE_TRACE ("TAO_Singleton<TYPE, ACE_LOCK>::dump"); + +#if !defined (ACE_LACKS_STATIC_DATA_MEMBER_TEMPLATES) + ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("instance_ = %x"), + TAO_Singleton<TYPE, ACE_LOCK>::instance_i ())); + ACE_DEBUG ((LM_DEBUG, ACE_END_DUMP)); +#endif /* ACE_LACKS_STATIC_DATA_MEMBER_TEMPLATES */ +} + +template <class TYPE, class ACE_LOCK> TAO_Singleton<TYPE, ACE_LOCK> *& +TAO_Singleton<TYPE, ACE_LOCK>::instance_i (void) +{ +#if defined (ACE_LACKS_STATIC_DATA_MEMBER_TEMPLATES) + // Pointer to the Singleton instance. This works around a bug with + // G++ and it's (mis-)handling of templates and statics... + static TAO_Singleton<TYPE, ACE_LOCK> *singleton_ = 0; + + return singleton_; +#else + return TAO_Singleton<TYPE, ACE_LOCK>::singleton_; +#endif /* ACE_LACKS_STATIC_DATA_MEMBER_TEMPLATES */ +} + +template <class TYPE, class ACE_LOCK> TYPE * +TAO_Singleton<TYPE, ACE_LOCK>::instance (void) +{ + ACE_TRACE ("TAO_Singleton<TYPE, ACE_LOCK>::instance"); + + TAO_Singleton<TYPE, ACE_LOCK> *&singleton = + TAO_Singleton<TYPE, ACE_LOCK>::instance_i (); + + // Perform the Double-Check pattern... + if (singleton == 0) + { + if (TAO_Singleton_Manager::starting_up () || + TAO_Singleton_Manager::shutting_down ()) + { + // The program is still starting up, and therefore assumed + // to be single threaded. There's no need to double-check. + // Or, the TAO_Singleton_Manager instance has been destroyed, + // so the preallocated lock is not available. Either way, + // don't register for destruction with the + // TAO_Singleton_Manager: we'll have to leak this instance. + + ACE_NEW_RETURN (singleton, (TAO_Singleton<TYPE, ACE_LOCK>), 0); + } + else + { +#if defined (ACE_MT_SAFE) && (ACE_MT_SAFE != 0) + // Obtain a lock from the ACE_Object_Manager. The pointer + // is static, so we only obtain one per TAO_Singleton + // instantiation. + static ACE_LOCK *lock = 0; + if (ACE_Object_Manager::get_singleton_lock (lock) != 0) + // Failed to acquire the lock! + return 0; + + ACE_GUARD_RETURN (ACE_LOCK, ace_mon, *lock, 0); + + if (singleton == 0) + { +#endif /* ACE_MT_SAFE */ + ACE_NEW_RETURN (singleton, (TAO_Singleton<TYPE, ACE_LOCK>), 0); + + // Register for destruction with TAO_Singleton_Manager. + TAO_Singleton_Manager::at_exit (singleton); +#if defined (ACE_MT_SAFE) && (ACE_MT_SAFE != 0) + } +#endif /* ACE_MT_SAFE */ + } + } + + return &singleton->instance_; +} + +template <class TYPE, class ACE_LOCK> void +TAO_Singleton<TYPE, ACE_LOCK>::cleanup (void *) +{ + delete this; + TAO_Singleton<TYPE, ACE_LOCK>::instance_i () = 0; +} + +#if !defined (ACE_LACKS_STATIC_DATA_MEMBER_TEMPLATES) +// Pointer to the Singleton instance. +template <class TYPE, class ACE_LOCK> TAO_Singleton<TYPE, ACE_LOCK> * +TAO_Singleton<TYPE, ACE_LOCK>::singleton_ = 0; + +template <class TYPE, class ACE_LOCK> TAO_TSS_Singleton<TYPE, ACE_LOCK> * +TAO_TSS_Singleton<TYPE, ACE_LOCK>::singleton_ = 0; +#endif /* !defined (ACE_LACKS_STATIC_DATA_MEMBER_TEMPLATES) */ + + +template <class TYPE, class ACE_LOCK> void +TAO_TSS_Singleton<TYPE, ACE_LOCK>::dump (void) +{ + ACE_TRACE ("TAO_TSS_Singleton<TYPE, ACE_LOCK>::dump"); + +#if !defined (ACE_LACKS_STATIC_DATA_MEMBER_TEMPLATES) + ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("instance_ = %x"), + TAO_TSS_Singleton<TYPE, ACE_LOCK>::instance_i ())); + ACE_DEBUG ((LM_DEBUG, ACE_END_DUMP)); +#endif /* ACE_LACKS_STATIC_DATA_MEMBER_TEMPLATES */ +} + +template <class TYPE, class ACE_LOCK> TAO_TSS_Singleton<TYPE, ACE_LOCK> *& +TAO_TSS_Singleton<TYPE, ACE_LOCK>::instance_i (void) +{ +#if defined (ACE_LACKS_STATIC_DATA_MEMBER_TEMPLATES) + // Pointer to the Singleton instance. This works around a bug with + // G++ and it's (mis-)handling of templates and statics... + static TAO_TSS_Singleton<TYPE, ACE_LOCK> *singleton_ = 0; + + return singleton_; +#else + return TAO_TSS_Singleton<TYPE, ACE_LOCK>::singleton_; +#endif /* ACE_LACKS_STATIC_DATA_MEMBER_TEMPLATES */ +} + +template <class TYPE, class ACE_LOCK> TYPE * +TAO_TSS_Singleton<TYPE, ACE_LOCK>::instance (void) +{ + ACE_TRACE ("TAO_TSS_Singleton<TYPE, ACE_LOCK>::instance"); + + TAO_TSS_Singleton<TYPE, ACE_LOCK> *&singleton = + TAO_TSS_Singleton<TYPE, ACE_LOCK>::instance_i (); + + // Perform the Double-Check pattern... + if (singleton == 0) + { + if (TAO_Singleton_Manager::starting_up () || + TAO_Singleton_Manager::shutting_down ()) + { + // The program is still starting up, and therefore assumed + // to be single threaded. There's no need to double-check. + // Or, the TAO_Singleton_Manager instance has been destroyed, + // so the preallocated lock is not available. Either way, + // don't register for destruction with the + // TAO_Singleton_Manager: we'll have to leak this instance. + + ACE_NEW_RETURN (singleton, (TAO_TSS_Singleton<TYPE, ACE_LOCK>), 0); + } + else + { +#if defined (ACE_MT_SAFE) && (ACE_MT_SAFE != 0) + // Obtain a lock from the ACE_Object_Manager. The pointer + // is static, so we only obtain one per TAO_Singleton + // instantiation. + static ACE_LOCK *lock = 0; + if (ACE_Object_Manager::get_singleton_lock (lock) != 0) + // Failed to acquire the lock! + return 0; + + ACE_GUARD_RETURN (ACE_LOCK, ace_mon, *lock, 0); + + if (singleton == 0) + { +#endif /* ACE_MT_SAFE */ + ACE_NEW_RETURN (singleton, (TAO_TSS_Singleton<TYPE, ACE_LOCK>), + 0); + + // Register for destruction with TAO_Singleton_Manager. + TAO_Singleton_Manager::at_exit (singleton); +#if defined (ACE_MT_SAFE) && (ACE_MT_SAFE != 0) + } +#endif /* ACE_MT_SAFE */ + } + } + + return ACE_TSS_GET (&singleton->instance_, TYPE); +} + +template <class TYPE, class ACE_LOCK> void +TAO_TSS_Singleton<TYPE, ACE_LOCK>::cleanup (void *) +{ + delete this; + TAO_TSS_Singleton<TYPE, ACE_LOCK>::instance_i () = 0; +} + +TAO_END_VERSIONED_NAMESPACE_DECL + +#endif /* TAO_SINGLETON_CPP */ |