ACE_Dynamic_Cached_Allocator< ACE_LOCK > Class Template Reference

A size-based allocator that caches blocks for quicker access. More...

#include <Malloc_T.h>

Inheritance diagram for ACE_Dynamic_Cached_Allocator< ACE_LOCK >:

Collaboration diagram for ACE_Dynamic_Cached_Allocator< ACE_LOCK >:

Public Member Functions
	ACE_Dynamic_Cached_Allocator (size_t n_chunks, size_t chunk_size)
	~ACE_Dynamic_Cached_Allocator ()
	Clear things up.
void *	malloc (size_t nbytes=0)
virtual void *	calloc (size_t nbytes, char initial_value='\0')
virtual void *	calloc (size_t n_elem, size_t elem_size, char initial_value='\0')
void	free (void *)
	Return a chunk of memory back to free list cache.
size_t	pool_depth ()
	Return the number of chunks available in the cache.
Public Member Functions inherited from ACE_New_Allocator
virtual int	remove ()
	These methods are no-ops.
virtual int	bind (const char *name, void *pointer, int duplicates=0)
virtual int	trybind (const char *name, void *&pointer)
virtual int	find (const char *name, void *&pointer)
virtual int	find (const char *name)
	Returns 0 if the name is in the mapping. -1, otherwise.
virtual int	unbind (const char *name)
virtual int	unbind (const char *name, void *&pointer)
virtual int	sync (ssize_t len=-1, int flags=MS_SYNC)
virtual int	sync (void *addr, size_t len, int flags=MS_SYNC)
virtual int	protect (ssize_t len=-1, int prot=PROT_RDWR)
virtual int	protect (void *addr, size_t len, int prot=PROT_RDWR)
virtual void	dump () const
	Dump the state of the object.
Public Member Functions inherited from ACE_Allocator
	ACE_Allocator ()
	"No-op" constructor (needed to make certain compilers happy).
virtual	~ACE_Allocator ()
	Virtual destructor.

Private Attributes
char *	pool_
ACE_Locked_Free_List< ACE_Cached_Mem_Pool_Node< char >, ACE_LOCK >	free_list_
size_t	chunk_size_
	Remember the size of our chunks.

Additional Inherited Members
Public Types inherited from ACE_Allocator
typedef size_t	size_type
	Unsigned integer type used for specifying memory block lengths.
Static Public Member Functions inherited from ACE_Allocator
static ACE_Allocator *	instance ()
	Get pointer to a default ACE_Allocator.
static ACE_Allocator *	instance (ACE_Allocator *)
static void	close_singleton ()
	Delete the dynamically allocated Singleton.

Detailed Description

template<class ACE_LOCK>
class ACE_Dynamic_Cached_Allocator< ACE_LOCK >

A size-based allocator that caches blocks for quicker access.

This class enables caching of dynamically allocated, fixed-size chunks. Notice that the chunk_size must be greater than or equal to sizeof (void*) for this to work properly.

This class can be configured flexibly with different types of ACE_LOCK strategies that support the ACE_Thread_Mutex and ACE_Process_Mutex constructor API.

See also

ACE_Cached_Allocator

Constructor & Destructor Documentation

ACE_Dynamic_Cached_Allocator()

template<class ACE_LOCK >

ACE_Dynamic_Cached_Allocator< ACE_LOCK >::ACE_Dynamic_Cached_Allocator	(	size_t	n_chunks,
		size_t	chunk_size )

Create a cached memory pool with n_chunks chunks each with chunk_size size.

~ACE_Dynamic_Cached_Allocator()

template<class ACE_LOCK >

ACE_Dynamic_Cached_Allocator< ACE_LOCK >::~ACE_Dynamic_Cached_Allocator

(

)

Clear things up.

Member Function Documentation

calloc() [1/2]

template<class ACE_LOCK >

void * ACE_Dynamic_Cached_Allocator< ACE_LOCK >::calloc ( size_t n_elem, size_t elem_size, char initial_value = '\0' )

virtual

This method is a no-op and just returns 0 since the free list only works with fixed sized entities.

Reimplemented from ACE_New_Allocator.

calloc() [2/2]

template<class ACE_LOCK >

void * ACE_Dynamic_Cached_Allocator< ACE_LOCK >::calloc ( size_t nbytes, char initial_value = '\0' )

virtual

Get a chunk of memory from free list cache, giving them initial_value. Note that nbytes is only checked to make sure that it's less or equal to chunk_size, and is otherwise ignored since calloc() always returns a pointer to an item of chunk_size.

Reimplemented from ACE_New_Allocator.

free()

template<class ACE_LOCK >

void ACE_Dynamic_Cached_Allocator< ACE_LOCK >::free ( void * ptr )

virtual

Return a chunk of memory back to free list cache.

Reimplemented from ACE_New_Allocator.

malloc()

template<class ACE_LOCK >

void * ACE_Dynamic_Cached_Allocator< ACE_LOCK >::malloc ( size_t nbytes = 0 )

virtual

Get a chunk of memory from free list cache. Note that nbytes is only checked to make sure that it's less or equal to chunk_size, and is otherwise ignored since malloc() always returns a pointer to an item of chunk_size size.

Reimplemented from ACE_New_Allocator.

pool_depth()

template<class ACE_LOCK >

size_t ACE_Dynamic_Cached_Allocator< ACE_LOCK >::pool_depth ( )

inline

Return the number of chunks available in the cache.

Member Data Documentation

chunk_size_

template<class ACE_LOCK >

size_t ACE_Dynamic_Cached_Allocator< ACE_LOCK >::chunk_size_

private

Remember the size of our chunks.

free_list_

template<class ACE_LOCK >

ACE_Locked_Free_List<ACE_Cached_Mem_Pool_Node<char>, ACE_LOCK> ACE_Dynamic_Cached_Allocator< ACE_LOCK >::free_list_

private

Maintain a cached memory free list. We use char as template parameter, although sizeof(char) is usually less than sizeof(void*). Really important is that chunk_size must be greater or equal to sizeof(void*).

pool_

template<class ACE_LOCK >

char* ACE_Dynamic_Cached_Allocator< ACE_LOCK >::pool_

private

Remember how we allocate the memory in the first place so we can clear things up later.

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

• Malloc_T.h
• Malloc_T.cpp
• Malloc_T.inl