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/******************************************************
The lowest-level memory management
(c) 1994, 1995 Innobase Oy
Created 6/9/1994 Heikki Tuuri
*******************************************************/
#ifndef mem0pool_h
#define mem0pool_h
#include "univ.i"
#include "os0file.h"
#include "ut0lst.h"
typedef struct mem_area_struct mem_area_t;
typedef struct mem_pool_struct mem_pool_t;
/* The common memory pool */
extern mem_pool_t* mem_comm_pool;
/* Memory area header */
struct mem_area_struct{
ulint size_and_free; /* memory area size is obtained by
anding with ~MEM_AREA_FREE; area in
a free list if ANDing with
MEM_AREA_FREE results in nonzero */
UT_LIST_NODE_T(mem_area_t)
free_list; /* free list node */
};
/* Each memory area takes this many extra bytes for control information */
#define MEM_AREA_EXTRA_SIZE (ut_calc_align(sizeof(struct mem_area_struct),\
UNIV_MEM_ALIGNMENT))
/************************************************************************
Creates a memory pool. */
mem_pool_t*
mem_pool_create(
/*============*/
/* out: memory pool */
ulint size); /* in: pool size in bytes */
/************************************************************************
Allocates memory from a pool. NOTE: This low-level function should only be
used in mem0mem.*! */
void*
mem_area_alloc(
/*===========*/
/* out, own: allocated memory buffer */
ulint size, /* in: allocated size in bytes; for optimum
space usage, the size should be a power of 2
minus MEM_AREA_EXTRA_SIZE */
mem_pool_t* pool); /* in: memory pool */
/************************************************************************
Frees memory to a pool. */
void
mem_area_free(
/*==========*/
void* ptr, /* in, own: pointer to allocated memory
buffer */
mem_pool_t* pool); /* in: memory pool */
/************************************************************************
Returns the amount of reserved memory. */
ulint
mem_pool_get_reserved(
/*==================*/
/* out: reserved mmeory in bytes */
mem_pool_t* pool); /* in: memory pool */
/************************************************************************
Reserves the mem pool mutex. */
void
mem_pool_mutex_enter(void);
/*======================*/
/************************************************************************
Releases the mem pool mutex. */
void
mem_pool_mutex_exit(void);
/*=====================*/
/************************************************************************
Validates a memory pool. */
ibool
mem_pool_validate(
/*==============*/
/* out: TRUE if ok */
mem_pool_t* pool); /* in: memory pool */
/************************************************************************
Prints info of a memory pool. */
void
mem_pool_print_info(
/*================*/
FILE* outfile,/* in: output file to write to */
mem_pool_t* pool); /* in: memory pool */
#ifndef UNIV_NONINL
#include "mem0pool.ic"
#endif
#endif
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