ACE_Cached_Allocator< T, ACE_LOCK > Class Template Reference

A fixed-size allocator that caches items for quicker access. More...

#include <Malloc_T.h>

Inheritance diagram for ACE_Cached_Allocator< T, ACE_LOCK >:

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Collaboration diagram for ACE_Cached_Allocator< T, ACE_LOCK >:

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List of all members.

Public Member Functions
	ACE_Cached_Allocator (size_t n_chunks)
	~ACE_Cached_Allocator (void)
	Clear things up.
void *	malloc (size_t nbytes=sizeof(T))
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 (void)
	Return the number of chunks available in the cache.
Private Attributes
char *	pool_
ACE_Locked_Free_List < ACE_Cached_Mem_Pool_Node< T > , ACE_LOCK >	free_list_
	Maintain a cached memory free list.

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Detailed Description

template<class T, class ACE_LOCK>
class ACE_Cached_Allocator< T, ACE_LOCK >

A fixed-size allocator that caches items for quicker access.

This class enables caching of dynamically allocated, fixed-sized classes. Notice that the sizeof (TYPE) 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, ACE_Thread_Semaphore, ACE_Process_Mutex, and ACE_Process_Semaphore constructor API.

See also:

ACE_Dynamic_Cached_Allocator

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Constructor & Destructor Documentation

template<class T, class ACE_LOCK>

ACE_BEGIN_VERSIONED_NAMESPACE_DECL ACE_Cached_Allocator< T, ACE_LOCK >::ACE_Cached_Allocator

(

size_t

n_chunks

)

[inline]

Create a cached memory pool with n_chunks chunks each with sizeof (TYPE) size.

template<class T, class ACE_LOCK>

ACE_Cached_Allocator< T, ACE_LOCK >::~ACE_Cached_Allocator

(

void

)

[inline]

Clear things up.

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Member Function Documentation

template<class T, class ACE_LOCK>

void * ACE_Cached_Allocator< T, ACE_LOCK >::malloc

(

size_t

nbytes = sizeof (T)

)

[inline, 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 sizeof T, and is otherwise ignored since malloc() always returns a pointer to an item of sizeof (T).

Reimplemented from ACE_New_Allocator.

template<class T, class ACE_LOCK>

void * ACE_Cached_Allocator< T, ACE_LOCK >::calloc	(	size_t	nbytes,
		char	initial_value = '\0'
	)			[inline, 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 sizeof T, and is otherwise ignored since calloc() always returns a pointer to an item of sizeof (T).

Reimplemented from ACE_New_Allocator.

template<class T, class ACE_LOCK>

void * ACE_Cached_Allocator< T, ACE_LOCK >::calloc	(	size_t	n_elem,
		size_t	elem_size,
		char	initial_value = '\0'
	)			[inline, 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.

template<class T, class ACE_LOCK>

void ACE_Cached_Allocator< T, ACE_LOCK >::free

(

void *

ptr

)

[inline, virtual]

Return a chunk of memory back to free list cache.

Reimplemented from ACE_New_Allocator.

template<class T, class ACE_LOCK>

ACE_INLINE size_t ACE_Cached_Allocator< T, ACE_LOCK >::pool_depth

(

void

)

[inline]

Return the number of chunks available in the cache.

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Member Data Documentation

template<class T, class ACE_LOCK>

char* ACE_Cached_Allocator< T, ACE_LOCK >::pool_ [private]

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

template<class T, class ACE_LOCK>

ACE_Locked_Free_List<ACE_Cached_Mem_Pool_Node<T>, ACE_LOCK> ACE_Cached_Allocator< T, ACE_LOCK >::free_list_ [private]

Maintain a cached memory free list.

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

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