Internal Memory Allocation

Data Structures
struct	apr_memnode_t
Defines
#define	APR_MEMNODE_T_SIZE   APR_ALIGN_DEFAULT(sizeof(apr_memnode_t))
#define	APR_ALLOCATOR_MAX_FREE_UNLIMITED   0
Typedefs
typedef struct apr_allocator_t	apr_allocator_t
typedef struct apr_memnode_t	apr_memnode_t
Functions
apr_status_t	apr_allocator_create (apr_allocator_t **allocator)
void	apr_allocator_destroy (apr_allocator_t *allocator)
apr_memnode_t *	apr_allocator_alloc (apr_allocator_t *allocator, apr_size_t size)
void	apr_allocator_free (apr_allocator_t *allocator, apr_memnode_t *memnode)
void	apr_allocator_owner_set (apr_allocator_t *allocator, apr_pool_t *pool)
apr_pool_t *	apr_allocator_owner_get (apr_allocator_t *allocator)
void	apr_allocator_max_free_set (apr_allocator_t *allocator, apr_size_t size)
void	apr_allocator_mutex_set (apr_allocator_t *allocator, apr_thread_mutex_t *mutex)
apr_thread_mutex_t *	apr_allocator_mutex_get (apr_allocator_t *allocator)

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Define Documentation

#define APR_ALLOCATOR_MAX_FREE_UNLIMITED   0

Symbolic constants

#define APR_MEMNODE_T_SIZE   APR_ALIGN_DEFAULT(sizeof(apr_memnode_t))

The base size of a memory node - aligned.

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Typedef Documentation

typedef struct apr_allocator_t apr_allocator_t

the allocator structure

typedef struct apr_memnode_t apr_memnode_t

the structure which holds information about the allocation

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Function Documentation

apr_memnode_t* apr_allocator_alloc	(	apr_allocator_t *	allocator,
		apr_size_t	size
	)

Allocate a block of mem from the allocator

Parameters:

allocator	The allocator to allocate from
size	The size of the mem to allocate (excluding the memnode structure)

apr_status_t apr_allocator_create

(

apr_allocator_t **

allocator

)

Create a new allocator

Parameters:

allocator

The allocator we have just created.

void apr_allocator_destroy

(

apr_allocator_t *

allocator

)

Destroy an allocator

Parameters:

allocator

The allocator to be destroyed

Remarks:

Any memnodes not given back to the allocator prior to destroying will _not_ be free()d.

void apr_allocator_free	(	apr_allocator_t *	allocator,
		apr_memnode_t *	memnode
	)

Free a list of blocks of mem, giving them back to the allocator. The list is typically terminated by a memnode with its next field set to NULL.

Parameters:

allocator	The allocator to give the mem back to
memnode	The memory node to return

void apr_allocator_max_free_set	(	apr_allocator_t *	allocator,
		apr_size_t	size
	)

Set the current threshold at which the allocator should start giving blocks back to the system.

Parameters:

allocator	The allocator the set the threshold on
size	The threshold. 0 == unlimited.

apr_thread_mutex_t* apr_allocator_mutex_get

(

apr_allocator_t *

allocator

)

Get the mutex currently set for the allocator

Parameters:

allocator

The allocator

void apr_allocator_mutex_set	(	apr_allocator_t *	allocator,
		apr_thread_mutex_t *	mutex
	)

Set a mutex for the allocator to use

Parameters:

allocator	The allocator to set the mutex for
mutex	The mutex

apr_pool_t* apr_allocator_owner_get

(

apr_allocator_t *

allocator

)

Get the current owner of the allocator

Parameters:

allocator

The allocator to get the owner from

void apr_allocator_owner_set	(	apr_allocator_t *	allocator,
		apr_pool_t *	pool
	)

Set the owner of the allocator

Parameters:

allocator	The allocator to set the owner for
pool	The pool that is to own the allocator

Remarks:

Typically pool is the highest level pool using the allocator