memp.h File Reference

#include "lwip/opt.h"
#include "lwip/memp_std.h"

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Macros
#define	LWIP_MEMPOOL(name, num, size, desc)   MEMP_##name,

Enumerations
enum	memp_t { MEMP_MAX }

Functions
void	memp_init (void)
void *	memp_malloc (memp_t type)
void	memp_free (memp_t type, void *mem)

Macro Definition Documentation

LWIP_MEMPOOL

#define LWIP_MEMPOOL	(		name,
			num,
			size,
			desc
	)		MEMP_##name,

Definition at line 44 of file memp.h.

Enumeration Type Documentation

memp_t

enum memp_t

Enumerator
MEMP_MAX

Definition at line 43 of file memp.h.

             {
#define LWIP_MEMPOOL(name,num,size,desc)  MEMP_##name,
#include "lwip/memp_std.h"
  MEMP_MAX
} memp_t;

Function Documentation

memp_free()

void memp_free	(	memp_t	type,
		void *	mem
	)

Put an element back into its pool.

Parameters

type	the pool where to put mem
mem	the memp element to free

Definition at line 435 of file memp.c.

{
  struct memp *memp;
  SYS_ARCH_DECL_PROTECT(old_level);
 
  if (mem == NULL) {
    return;
  }
  LWIP_ASSERT("memp_free: mem properly aligned",
                ((mem_ptr_t)mem % MEM_ALIGNMENT) == 0);
 
  memp = (struct memp *)(void *)((u8_t*)mem - MEMP_SIZE);
 
  SYS_ARCH_PROTECT(old_level);
#if MEMP_OVERFLOW_CHECK
#if MEMP_OVERFLOW_CHECK >= 2
  memp_overflow_check_all();
#else
  memp_overflow_check_element_overflow(memp, type);
  memp_overflow_check_element_underflow(memp, type);
#endif /* MEMP_OVERFLOW_CHECK >= 2 */
#endif /* MEMP_OVERFLOW_CHECK */
 
  MEMP_STATS_DEC(used, type); 
  
  memp->next = memp_tab[type]; 
  memp_tab[type] = memp;
 
#if MEMP_SANITY_CHECK
  LWIP_ASSERT("memp sanity", memp_sanity());
#endif /* MEMP_SANITY_CHECK */
 
  SYS_ARCH_UNPROTECT(old_level);
}

Referenced by pbuf_free(), tcpip_callback_with_block(), tcpip_callbackmsg_delete(), tcpip_input(), and tcpip_thread().

memp_init()

void memp_init

(

void

)

Initialize this module.

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

Definition at line 338 of file memp.c.

{
  struct memp *memp;
  u16_t i, j;
 
  for (i = 0; i < MEMP_MAX; ++i) {
    MEMP_STATS_AVAIL(used, i, 0);
    MEMP_STATS_AVAIL(max, i, 0);
    MEMP_STATS_AVAIL(err, i, 0);
    MEMP_STATS_AVAIL(avail, i, memp_num[i]);
  }
 
#if !MEMP_SEPARATE_POOLS
  memp = (struct memp *)LWIP_MEM_ALIGN(memp_memory);
#endif /* !MEMP_SEPARATE_POOLS */
  /* for every pool: */
  for (i = 0; i < MEMP_MAX; ++i) {
    memp_tab[i] = NULL;
#if MEMP_SEPARATE_POOLS
    memp = (struct memp*)memp_bases[i];
#endif /* MEMP_SEPARATE_POOLS */
    /* create a linked list of memp elements */
    for (j = 0; j < memp_num[i]; ++j) {
      memp->next = memp_tab[i];
      memp_tab[i] = memp;
      memp = (struct memp *)(void *)((u8_t *)memp + MEMP_SIZE + memp_sizes[i]
#if MEMP_OVERFLOW_CHECK
        + MEMP_SANITY_REGION_AFTER_ALIGNED
#endif
      );
    }
  }
#if MEMP_OVERFLOW_CHECK
  memp_overflow_init();
  /* check everything a first time to see if it worked */
  memp_overflow_check_all();
#endif /* MEMP_OVERFLOW_CHECK */
}

Referenced by lwip_init().

memp_malloc()

void * memp_malloc

(

memp_t

type

)

Get an element from a specific pool.

Parameters

type	the pool to get an element from

the debug version has two more parameters:

Parameters

file	file name calling this function
line	number of line where this function is called

Returns

a pointer to the allocated memory or a NULL pointer on error

Definition at line 390 of file memp.c.

{
  struct memp *memp;
  SYS_ARCH_DECL_PROTECT(old_level);
 
  LWIP_ERROR("memp_malloc: type < MEMP_MAX", (type < MEMP_MAX), return NULL;);
 
  SYS_ARCH_PROTECT(old_level);
#if MEMP_OVERFLOW_CHECK >= 2
  memp_overflow_check_all();
#endif /* MEMP_OVERFLOW_CHECK >= 2 */
 
  memp = memp_tab[type];
  
  if (memp != NULL) {
    memp_tab[type] = memp->next;
#if MEMP_OVERFLOW_CHECK
    memp->next = NULL;
    memp->file = file;
    memp->line = line;
#endif /* MEMP_OVERFLOW_CHECK */
    MEMP_STATS_INC_USED(used, type);
    LWIP_ASSERT("memp_malloc: memp properly aligned",
                ((mem_ptr_t)memp % MEM_ALIGNMENT) == 0);
    memp = (struct memp*)(void *)((u8_t*)memp + MEMP_SIZE);
  } else {
    LWIP_DEBUGF(MEMP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("memp_malloc: out of memory in pool %s\n", memp_desc[type]));
    MEMP_STATS_INC(err, type);
  }
 
  SYS_ARCH_UNPROTECT(old_level);
 
  return memp;
}

Referenced by pbuf_alloc(), tcpip_callback_with_block(), tcpip_callbackmsg_new(), and tcpip_input().