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:

Public Types
enum	{ DEFAULT_SIZE = ACE_DEFAULT_DLL_MANAGER_SIZE }

Public Member Functions
ACE_DLL_Handle *	open_dll (const ACE_TCHAR *dll_name, int openmode, ACE_SHLIB_HANDLE handle, ACE_DLL_Handle::ERROR_STACK *errors=0)
int	close_dll (const ACE_TCHAR *dll_name)
	Close the underlying dll. Decrements the refcount. More...
u_long	unload_policy (void) const
	Returns the current per-process UNLOAD_POLICY. More...
void	unload_policy (u_long unload_policy)

Static Public Member Functions
static ACE_DLL_Manager *	instance (int size=ACE_DLL_Manager::DEFAULT_SIZE)
	Return a unique instance. More...

Public Attributes
	ACE_ALLOC_HOOK_DECLARE

Protected Member Functions
	ACE_DLL_Manager (int size=ACE_DLL_Manager::DEFAULT_SIZE)
	Default constructor. More...
	~ACE_DLL_Manager (void)
	Destructor. More...
int	open (int size)
	Allocate handle_vector_. More...
int	close (void)
	Close all open dlls and deallocate memory. More...
ACE_DLL_Handle *	find_dll (const ACE_TCHAR *dll_name) const
	Find dll in handle_vector_. More...
int	unload_dll (ACE_DLL_Handle *dll_handle, int force_unload=0)
	Applies strategy for unloading dll. More...

Private Member Functions
	ACE_DLL_Manager (const ACE_DLL_Manager &)
	Disallow copying and assignment since we don't handle these. More...
void	operator= (const ACE_DLL_Manager &)

Static Private Member Functions
static void	close_singleton (void)
	Close the singleton instance. More...

Private Attributes
ACE_DLL_Handle **	handle_vector_
	Vector containing all loaded handle objects. More...
int	current_size_
	Current number of handles. More...
int	total_size_
	Maximum number of handles. More...
u_long	unload_policy_
	Unload strategy. More...

Static Private Attributes
static ACE_DLL_Manager *	instance_ = 0
	Pointer to a process-wide ACE_DLL_Manager. More...

Friends
class	ACE_Framework_Repository
class	ACE_Object_Manager

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.

Member Enumeration Documentation

anonymous enum

Enumerator
DEFAULT_SIZE

Constructor & Destructor Documentation

ACE_DLL_Manager::ACE_DLL_Manager ( int  size = ACE_DLL_Manager::DEFAULT_SIZE )

protected

Default constructor.

ACE_DLL_Manager::~ACE_DLL_Manager ( void  )

protected

Destructor.

ACE_DLL_Manager::ACE_DLL_Manager ( const ACE_DLL_Manager &  )

private

Disallow copying and assignment since we don't handle these.

Member Function Documentation

int ACE_DLL_Manager::close ( void  )

protected

Close all open dlls and deallocate memory.

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  )

staticprivate

Close the singleton instance.

ACE_DLL_Handle * ACE_DLL_Manager::find_dll ( const ACE_TCHAR *  dll_name ) const

protected

Find dll in handle_vector_.

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

Allocate handle_vector_.

ACE_DLL_Handle * ACE_DLL_Manager::open_dll	(	const ACE_TCHAR *	dll_name,
		int	openmode,
		ACE_SHLIB_HANDLE	handle,
		ACE_DLL_Handle::ERROR_STACK *	errors = 0
	)

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

Applies strategy for unloading dll.

u_long ACE_DLL_Manager::unload_policy

(

void

)

const

Returns the current per-process UNLOAD_POLICY.

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.

Friends And Related Function Documentation

friend class ACE_Framework_Repository

friend

friend class ACE_Object_Manager

friend

Member Data Documentation

ACE_DLL_Manager::ACE_ALLOC_HOOK_DECLARE

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

staticprivate

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