malloc.h File Reference

Jo Engine Malloc. More...

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Macros
#define	JO_MALLOC_MAX_MEMORY_ZONE
	Define the total of memory zone available through jo_add_memory_zone().

Enumerations
enum	jo_extended_ram_cartridge_type { CART_NONE , CART_8MBits , CART_32MBits }
	Extended RAM cartridge type. More...
enum	jo_malloc_behaviour { JO_FAST_ALLOCATION , JO_MALLOC_TRY_REUSE_BLOCK , JO_MALLOC_TRY_REUSE_SAME_BLOCK_SIZE }
	Malloc behaviour JO_MALLOC_TRY_REUSE_SAME_BLOCK_SIZE | ^ | | Speed efficiency | | V | JO_MALLOC_TRY_REUSE_BLOCK | ^ | | Speed efficiency | | V | JO_FAST_ALLOCATION. More...

Functions
void *	jo_malloc_with_behaviour (unsigned int n, const jo_malloc_behaviour behaviour)
	dynamic memory allocator with specific behaviour
static __jo_force_inline void *	jo_malloc (unsigned int n)
	dynamic memory allocator
void	jo_free (const void *const p)
	function frees the memory space pointed to by p
void	jo_reduce_memory_fragmentation (void)
	Reduce memory fragmentation for faster memory allocation.
void	jo_add_memory_zone (unsigned char *ptr, const unsigned int size_in_bytes)
	Register a memory segment for jo_malloc() usage.
int	jo_memory_usage_percent (void)
	Get memory usage percent.
int	jo_memory_fragmentation (void)
	Get memory fragmentation (Number of fragment in memory).

Detailed Description

Jo Engine Malloc.

Author

Johannes Fetz

Bug

No known bugs.

Macro Definition Documentation

JO_MALLOC_MAX_MEMORY_ZONE

#define JO_MALLOC_MAX_MEMORY_ZONE

Define the total of memory zone available through jo_add_memory_zone().

Remarks

MAIN RAM + 32MB RAM Extension

Warning

Minimum is 9 for the engine with all modules

Enumeration Type Documentation

jo_extended_ram_cartridge_type

enum jo_extended_ram_cartridge_type

Extended RAM cartridge type.

Enumerator
CART_NONE	No cartridge.
CART_8MBits	1 Mb cartridge
CART_32MBits	4 Mb cartridge

jo_malloc_behaviour

enum jo_malloc_behaviour

Malloc behaviour JO_MALLOC_TRY_REUSE_SAME_BLOCK_SIZE | ^ | | Speed efficiency | | V | JO_MALLOC_TRY_REUSE_BLOCK | ^ | | Speed efficiency | | V | JO_FAST_ALLOCATION.

Enumerator
JO_FAST_ALLOCATION	Default behaviour.
JO_MALLOC_TRY_REUSE_BLOCK	A little bit slower but reduce memory fragmentation.
JO_MALLOC_TRY_REUSE_SAME_BLOCK_SIZE	A little bit slower than JO_MALLOC_TRY_REUSE_BLOCK but reduce memory usage.

Function Documentation

jo_add_memory_zone()

void jo_add_memory_zone	(	unsigned char *	ptr,
		const unsigned int	size_in_bytes )

Register a memory segment for jo_malloc() usage.

Parameters

ptr	Pointer to the beginning of the memory segment
size_in_bytes	Size of the memory segment in bytes

Remarks

See also JO_MALLOC_MAX_MEMORY_ZONE

jo_free()

void jo_free

(

const void *const

p

)

function frees the memory space pointed to by p

Parameters

p	pointer that must have been returned by a previous call to jo_malloc()

jo_malloc()

__jo_force_inline void * jo_malloc ( unsigned int n )

static

dynamic memory allocator

Parameters

n	Segment size

Returns

a pointer to the allocated memory or NULL if failed

jo_malloc_with_behaviour()

void * jo_malloc_with_behaviour	(	unsigned int	n,
		const jo_malloc_behaviour	behaviour )

dynamic memory allocator with specific behaviour

Parameters

n	Segment size
behaviour	Allocation Behaviour

Returns

a pointer to the allocated memory or NULL if failed

jo_memory_fragmentation()

int jo_memory_fragmentation

(

void

)

Get memory fragmentation (Number of fragment in memory).

Returns

Memory fragmentation

Remarks

jo_printf(0, 0, "Dynamic memory fragmentation count: %d ", jo_memory_fragmentation());

jo_memory_usage_percent()

int jo_memory_usage_percent

(

void

)

Get memory usage percent.

Returns

memory usage percent

Remarks

jo_printf(0, 0, "Dynamic memory usage: %d%% ", jo_memory_usage_percent());

jo_reduce_memory_fragmentation()

void jo_reduce_memory_fragmentation

(

void

)

Reduce memory fragmentation for faster memory allocation.

Remarks

This function can be slow