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memp.c File Reference
Dynamic pool memory manager.
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static int memp_sanity (void) Check that memp-lists don't form a circle. static void memp_overflow_check_element_overflow (struct memp *p, u16_t memp_type) Check if a memp element was victim of an overflow (e.g. static void memp_overflow_check_element_underflow (struct memp *p, u16_t memp_type) Check if a memp element was victim of an underflow (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. static struct memp *memp_tab[MEMP_MAX] MEM_POSITION 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 *const memp_bases [] This array holds the base of each memory pool.
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:
type the pool where to put mem mem the memp element to free
Definition at line 434 of file memp.c .
Initialize this module.
Carves out memp_memory into linked lists for each pool-type.
Definition at line 337 of file memp.c .
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
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 280 of file memp.c .
static void memp_overflow_check_element_overflow
(
struct memp *
p ,
u16_t
memp_type
)
[static]
Check if a memp element was victim of an overflow (e.g.
the restricted area after it has been altered)
Parameters:
p the memp element to check memp_type the pool p comes from
Definition at line 216 of file memp.c .
static void memp_overflow_check_element_underflow
(
struct memp *
p ,
u16_t
memp_type
)
[static]
Check if a memp element was victim of an underflow (e.g.
the restricted area before it has been altered)
Parameters:
p the memp element to check memp_type the pool p comes from
Definition at line 249 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 307 of file memp.c .
static int memp_sanity
(
void
)
[static]
Check that memp-lists don't form a circle.
Definition at line 182 of file memp.c .
Variable Documentation
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"] MEM_POSITION [static]
This array holds the first free element of each pool.
This is the actual memory used by the pools (all pools in one big block).
Elements form a linked list.
Definition at line 117 of file memp.c .
Initial value: {
#define LWIP_MEMPOOL(name,num,size,desc) memp_memory_ ## name ## _base,
#include "lwip/memp_std.h"
} MEM_POSITION
This array holds the base of each memory pool.
Definition at line 162 of file memp.c .
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 144 of file memp.c .
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 137 of file memp.c .
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 129 of file memp.c .
1.7.2