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memp.c File Reference
Functions | Variables

memp.c File Reference

Dynamic pool memory manager. More...

Go to the source code of this file.

Functions

static int memp_sanity (void)
 Check that memp-lists don't form a circle.
static void memp_overflow_check_element (struct memp *p, u16_t memp_size)
 Check if a memp element was victim of an overflow (e.g.
static void memp_overflow_check_all (void)
 Do an overflow check for all elements in every pool.
static void memp_overflow_init (void)
 Initialize the restricted areas of all memp elements in every pool.
void memp_init (void)
 Initialize this module.
void * memp_malloc (memp_t type) memp_malloc_fn(memp_t type
 Get an element from a specific pool.
void memp_free (memp_t type, void *mem)
 Put an element back into its pool.

Variables

static struct memp * memp_tab [MEMP_MAX]
 This array holds the first free element of each pool.
static const u16_t memp_sizes [MEMP_MAX]
 This array holds the element sizes of each pool.
static const u16_t memp_num [MEMP_MAX]
 This array holds the number of elements in each pool.
static const char * memp_desc [MEMP_MAX]
 This array holds a textual description of each pool.
static u8_t memp_memory [MEM_ALIGNMENT-1#define LWIP_MEMPOOL(name, num, size, desc)+((num)*(MEMP_SIZE+MEMP_ALIGN_SIZE(size)))#include"lwip/memp_std.h"]
 This is the actual memory used by the pools.

Detailed Description

Dynamic pool memory manager.

lwIP has dedicated pools for many structures (netconn, protocol control blocks, packet buffers, ...). All these pools are managed here.

Definition in file memp.c.

Function Documentation

void memp_free ( memp_t  type,
void *  mem 
)

Put an element back into its pool.

Parameters:
typethe pool where to put mem
memthe memp element to free

Definition at line 352 of file memp.c.

void memp_init ( void   )

Initialize this module.

Carves out memp_memory into linked lists for each pool-type.

Definition at line 260 of file memp.c.

void* memp_malloc ( memp_t  type )

Get an element from a specific pool.

Parameters:
typethe pool to get an element from

the debug version has two more parameters:

Parameters:
filefile name calling this function
linenumber of line where this function is called
Returns:
a pointer to the allocated memory or a NULL pointer on error
memp_overflow_check_all ( void   ) [static]

Do an overflow check for all elements in every pool.

See also:
memp_overflow_check_element for a description of the check

Definition at line 211 of file memp.c.

static void memp_overflow_check_element ( struct memp *  p,
u16_t  memp_size 
) [static]

Check if a memp element was victim of an overflow (e.g.

the restricted area after it has been altered)

Parameters:
pthe memp element to check
memp_sizethe element size of the pool p comes from

Definition at line 183 of file memp.c.

static void memp_overflow_init ( void   ) [static]

Initialize the restricted areas of all memp elements in every pool.

Definition at line 230 of file memp.c.

static int memp_sanity ( void   ) [static]

Check that memp-lists don't form a circle.

Definition at line 156 of file memp.c.

Variable Documentation

const char* memp_desc[MEMP_MAX] [static]
Initial value:
 {
#define LWIP_MEMPOOL(name,num,size,desc)  (desc),
#include "lwip/memp_std.h"
}

This array holds a textual description of each pool.

Definition at line 139 of file memp.c.

u8_t memp_memory[MEM_ALIGNMENT-1#define LWIP_MEMPOOL(name, num, size, desc)+((num)*(MEMP_SIZE+MEMP_ALIGN_SIZE(size)))#include"lwip/memp_std.h"] [static]

This is the actual memory used by the pools.

Definition at line 149 of file memp.c.

const u16_t memp_num[MEMP_MAX] [static]
Initial value:
 {
#define LWIP_MEMPOOL(name,num,size,desc)  (num),
#include "lwip/memp_std.h"
}

This array holds the number of elements in each pool.

Definition at line 132 of file memp.c.

const u16_t memp_sizes[MEMP_MAX] [static]
Initial value:
 {
#define LWIP_MEMPOOL(name,num,size,desc)  LWIP_MEM_ALIGN_SIZE(size),
#include "lwip/memp_std.h"
}

This array holds the element sizes of each pool.

Definition at line 124 of file memp.c.

struct memp* memp_tab[MEMP_MAX] [static]

This array holds the first free element of each pool.

Elements form a linked list.

Definition at line 112 of file memp.c.

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