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ACE_DLL_Manager Class Reference

This class is a singleton and serves as a factory and repository for instances of ACE_DLL_Handle. More...

#include <DLL_Manager.h>

Collaboration diagram for ACE_DLL_Manager:

[legend]List of all members.

Public Types
enum	{ DEFAULT_SIZE = ACE_DEFAULT_DLL_MANAGER_SIZE }
Public Methods
ACE_DLL_Handle *	open_dll (const ACE_TCHAR *dll_name, int openmode, ACE_SHLIB_HANDLE handle)
int	close_dll (const ACE_TCHAR *dll_name)
	Close the underlying dll. Decrements the refcount.
u_long	unload_policy (void) const
	Returns the current per-process UNLOAD_POLICY.
void	unload_policy (u_long unload_policy)
Static Public Methods
ACE_DLL_Manager *	instance (int size=ACE_DLL_Manager::DEFAULT_SIZE)
	Return a unique instance.
Protected Methods
int	open (int size)
int	close (void)
ACE_DLL_Handle *	find_dll (const ACE_TCHAR *dll_name) const
int	unload_dll (ACE_DLL_Handle *dll_handle, int force_unload=0)
Private Methods
	ACE_DLL_Manager (int size=ACE_DLL_Manager::DEFAULT_SIZE)
	Default constructor.
	~ACE_DLL_Manager (void)
	Destructor.
	ACE_DLL_Manager (const ACE_DLL_Manager &)
void	operator= (const ACE_DLL_Manager &)
Static Private Methods
void	close_singleton (void)
	Close the singleton instance.
Private Attributes
ACE_DLL_Handle **	handle_vector_
	Vector containing all loaded handle objects.
int	current_size_
	Current number of handles.
int	total_size_
	Maximum number of handles.
u_long	unload_policy_
	Unload strategy.
Static Private Attributes
ACE_DLL_Manager *	instance_ = 0
	Pointer to a process-wide <ACE_DLL_Manager>.
Friends
class	ACE_Framework_Repository

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Detailed Description

This class is a singleton and serves as a factory and repository for instances of ACE_DLL_Handle.

This class is a singleton whose lifetime is managed by the ACE_Framework_Repository. Although it is normally meant to be used directly only by ACE_DLL, applications can call the unload_policy() methods in order get/set the the dll unload policy. Unload policies include per_process/per-dll and eager/lazy. Dlls can export set their own policy by using the ACE_DLL_UNLOAD_POLICY macro found in config-all.h. If a dll choses to set an unload policy, it will be used when the per-dll policy (the default) is in effect. If the per-dll policy is in effect and a dll has not chosen to set a policy, the current per-process policy will be used.

The following policy macros are provided in config-all.h:

ACE_DLL_UNLOAD_POLICY_PER_PROCESS - Per-process policy that unloads dlls eagerly.

ACE_DLL_UNLOAD_POLICY_PER_DLL - Apply policy on a per-dll basis. If the dll doesn't use one of the macros below, the current per-process policy will be used.

ACE_DLL_UNLOAD_POLICY_LAZY - Don't unload dll when refcount reaches zero, i.e., wait for either an explicit unload request or program exit.

ACE_DLL_UNLOAD_POLICY_DEFAULT - Default policy allows dlls to control their own destinies, but will unload those that don't make a choice eagerly.

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Member Enumeration Documentation

anonymous enum

Enumeration values: DEFAULT_SIZE

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Constructor & Destructor Documentation

ACE_DLL_Manager::ACE_DLL_Manager (  int    size = ACE_DLL_Manager::DEFAULT_SIZE )  [private]

Default constructor.

ACE_DLL_Manager::~ACE_DLL_Manager (  void    )  [private]

Destructor.

ACE_DLL_Manager::ACE_DLL_Manager (  const ACE_DLL_Manager &    )  [private]

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Member Function Documentation

int ACE_DLL_Manager::close (  void    )  [protected]

int ACE_DLL_Manager::close_dll (  const ACE_TCHAR *    dll_name )

Close the underlying dll. Decrements the refcount.

void ACE_DLL_Manager::close_singleton (  void    )  [static, private]

Close the singleton instance.

ACE_DLL_Handle * ACE_DLL_Manager::find_dll (  const ACE_TCHAR *    dll_name )  const [protected]

ACE_DLL_Manager * ACE_DLL_Manager::instance (  int    size = ACE_DLL_Manager::DEFAULT_SIZE )  [static]

Return a unique instance.

int ACE_DLL_Manager::open (  int    size )  [protected]

ACE_DLL_Handle * ACE_DLL_Manager::open_dll (  const ACE_TCHAR *    dll_name, int    openmode, ACE_SHLIB_HANDLE    handle )

Factory for ACE_DLL_Handle objects. If one already exits, its refcount is incremented.

void ACE_DLL_Manager::operator= (  const ACE_DLL_Manager &    )  [private]

int ACE_DLL_Manager::unload_dll (  ACE_DLL_Handle *    dll_handle, int    force_unload = 0 )  [protected]

void ACE_DLL_Manager::unload_policy (  u_long    unload_policy )

Set the per-process UNLOAD_POLICY. If the policy is changed from LAZY to EAGER, then it will also unload any dlls with zero refcounts.

u_long ACE_DLL_Manager::unload_policy (  void    )  const

Returns the current per-process UNLOAD_POLICY.

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Friends And Related Function Documentation

friend class ACE_Framework_Repository [friend]

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Member Data Documentation

int ACE_DLL_Manager::current_size_ [private]

Current number of handles.

ACE_DLL_Handle** ACE_DLL_Manager::handle_vector_ [private]

Vector containing all loaded handle objects.

ACE_DLL_Manager * ACE_DLL_Manager::instance_ = 0 [static, private]

Pointer to a process-wide <ACE_DLL_Manager>.

int ACE_DLL_Manager::total_size_ [private]

Maximum number of handles.

u_long ACE_DLL_Manager::unload_policy_ [private]

Unload strategy.

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The documentation for this class was generated from the following files:

• DLL_Manager.h
• DLL_Manager.cpp

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