my_memory.cc File Reference

#include "mysql/components/library_mysys/my_memory.h"
#include <assert.h>
#include <stdlib.h>
#include "mysql/components/services/psi_memory.h"

Classes
struct	my_memory_header

Macros
#define	MEM_MALLOCLIKE_BLOCK(p1, p2, p3, p4)
#define	MEM_FREELIKE_BLOCK(p1, p2)
#define	HEADER_SIZE   32
#define	MAGIC   1234
#define	USER_TO_HEADER(P)   ((my_memory_header *)(((char *)P) - HEADER_SIZE))
#define	HEADER_TO_USER(P)   (((char *)P) + HEADER_SIZE)

Typedefs
typedef struct my_memory_header	my_memory_header

Functions
void *	my_malloc (PSI_memory_key key, size_t size, int flags)
	Allocates size bytes of memory. More...
void	my_free (void *ptr)
	Frees the memory pointed by the ptr. More...

Macro Definition Documentation

HEADER_SIZE

#define HEADER_SIZE   32

HEADER_TO_USER

#define HEADER_TO_USER

(

P

)

(((char *)P) + HEADER_SIZE)

MAGIC

#define MAGIC   1234

MEM_FREELIKE_BLOCK

#define MEM_FREELIKE_BLOCK	(		p1,
			p2
	)

Value:

  do {                             \
  } while (0)

MEM_MALLOCLIKE_BLOCK

#define MEM_MALLOCLIKE_BLOCK	(		p1,
			p2,
			p3,
			p4
	)

Value:

  do {                                       \
  } while (0)

USER_TO_HEADER

#define USER_TO_HEADER

(

P

)

((my_memory_header *)(((char *)P) - HEADER_SIZE))

Typedef Documentation

my_memory_header

typedef struct my_memory_header my_memory_header

Function Documentation

my_free()

void my_free

(

void *

ptr

)

Frees the memory pointed by the ptr.

Parameters

ptr	memory address to be freed

my_malloc()

void * my_malloc	(	PSI_memory_key	key,
		size_t	size,
		int	flags
	)

Allocates size bytes of memory.

Parameters

key	P_S key used for memory instrumentation
size	size bytes to allocate the memory
flags	used at the time of allocation. Could be MY_ZEROFILL