MeterLogger
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#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/mem.h"
#include "lwip/sys.h"
#include "lwip/stats.h"
#include "lwip/err.h"
#include <string.h>
Go to the source code of this file.
Data Structures | |
struct | mem |
Macros | |
#define | MIN_SIZE 12 |
#define | MIN_SIZE_ALIGNED LWIP_MEM_ALIGN_SIZE(MIN_SIZE) |
#define | SIZEOF_STRUCT_MEM LWIP_MEM_ALIGN_SIZE(sizeof(struct mem)) |
#define | MEM_SIZE_ALIGNED LWIP_MEM_ALIGN_SIZE(MEM_SIZE) |
#define | LWIP_RAM_HEAP_POINTER ram_heap |
#define | LWIP_MEM_FREE_DECL_PROTECT() |
#define | LWIP_MEM_FREE_PROTECT() sys_mutex_lock(&mem_mutex) |
#define | LWIP_MEM_FREE_UNPROTECT() sys_mutex_unlock(&mem_mutex) |
#define | LWIP_MEM_ALLOC_DECL_PROTECT() |
#define | LWIP_MEM_ALLOC_PROTECT() |
#define | LWIP_MEM_ALLOC_UNPROTECT() |
Functions | |
static void ICACHE_FLASH_ATTR | plug_holes (struct mem *mem) |
void | mem_init (void) |
void | mem_free (void *rmem) |
void * | mem_trim (void *rmem, mem_size_t newsize) |
void * | mem_malloc (mem_size_t size) |
void * | mem_calloc (mem_size_t count, mem_size_t size) |
Variables | |
struct mem | __ATTRIB_PACK |
u8_t ram_heap [MEM_SIZE_ALIGNED+(2 *SIZEOF_STRUCT_MEM)+MEM_ALIGNMENT | SHMEM_ATTR ) |
static u8_t * | ram |
static struct mem * | ram_end |
static struct mem * | lfree |
Dynamic memory manager
This is a lightweight replacement for the standard C library malloc().
If you want to use the standard C library malloc() instead, define MEM_LIBC_MALLOC to 1 in your lwipopts.h
To let mem_malloc() use pools (prevents fragmentation and is much faster than a heap but might waste some memory), define MEM_USE_POOLS to 1, define MEM_USE_CUSTOM_POOLS to 1 and create a file "lwippools.h" that includes a list of pools like this (more pools can be added between _START and _END):
Define three pools with sizes 256, 512, and 1512 bytes LWIP_MALLOC_MEMPOOL_START LWIP_MALLOC_MEMPOOL(20, 256) LWIP_MALLOC_MEMPOOL(10, 512) LWIP_MALLOC_MEMPOOL(5, 1512) LWIP_MALLOC_MEMPOOL_END
Definition in file mem.c.
#define LWIP_MEM_ALLOC_DECL_PROTECT | ( | ) |
Definition at line 216 of file mem.c.
Referenced by mem_malloc().
#define LWIP_MEM_ALLOC_PROTECT | ( | ) |
Definition at line 217 of file mem.c.
Referenced by mem_malloc().
#define LWIP_MEM_ALLOC_UNPROTECT | ( | ) |
Definition at line 218 of file mem.c.
Referenced by mem_malloc().
#define LWIP_MEM_FREE_DECL_PROTECT | ( | ) |
concurrent access protection
Definition at line 212 of file mem.c.
Referenced by mem_free(), and mem_trim().
#define LWIP_MEM_FREE_PROTECT | ( | ) | sys_mutex_lock(&mem_mutex) |
Definition at line 213 of file mem.c.
Referenced by mem_free(), and mem_trim().
#define LWIP_MEM_FREE_UNPROTECT | ( | ) | sys_mutex_unlock(&mem_mutex) |
Definition at line 214 of file mem.c.
Referenced by mem_free(), and mem_trim().
#define LWIP_RAM_HEAP_POINTER ram_heap |
Definition at line 184 of file mem.c.
Referenced by mem_init().
#define MEM_SIZE_ALIGNED LWIP_MEM_ALIGN_SIZE(MEM_SIZE) |
Definition at line 174 of file mem.c.
Referenced by mem_init(), mem_malloc(), mem_trim(), and plug_holes().
#define MIN_SIZE 12 |
#define MIN_SIZE_ALIGNED LWIP_MEM_ALIGN_SIZE(MIN_SIZE) |
Definition at line 172 of file mem.c.
Referenced by mem_malloc(), and mem_trim().
#define SIZEOF_STRUCT_MEM LWIP_MEM_ALIGN_SIZE(sizeof(struct mem)) |
Definition at line 173 of file mem.c.
Referenced by mem_free(), mem_init(), mem_malloc(), and mem_trim().
void* mem_calloc | ( | mem_size_t | count, |
mem_size_t | size | ||
) |
Contiguously allocates enough space for count objects that are size bytes of memory each and returns a pointer to the allocated memory.
The allocated memory is filled with bytes of value zero.
count | number of objects to allocate |
size | size of the objects to allocate |
Definition at line 631 of file mem.c.
References mem_malloc(), and os_memset.
void mem_free | ( | void * | rmem | ) |
Put a struct mem back on the heap
rmem | is the data portion of a struct mem as returned by a previous call to mem_malloc() |
Definition at line 310 of file mem.c.
References LWIP_ASSERT, LWIP_DBG_LEVEL_SERIOUS, LWIP_DBG_LEVEL_SEVERE, LWIP_DBG_TRACE, LWIP_DEBUGF, LWIP_MEM_FREE_DECL_PROTECT, LWIP_MEM_FREE_PROTECT, LWIP_MEM_FREE_UNPROTECT, MEM_ALIGNMENT, MEM_DEBUG, MEM_STATS_DEC_USED, MEM_STATS_INC, mem::next, NULL, plug_holes(), SIZEOF_STRUCT_MEM, SYS_ARCH_DECL_PROTECT, SYS_ARCH_PROTECT, SYS_ARCH_UNPROTECT, and mem::used.
Referenced by mem_free_callback(), and pbuf_free().
void mem_init | ( | void | ) |
Zero the heap and initialize start, end and lowest-free
Definition at line 273 of file mem.c.
References ERR_OK, LWIP_ASSERT, LWIP_MEM_ALIGN, LWIP_RAM_HEAP_POINTER, MEM_ALIGNMENT, MEM_SIZE_ALIGNED, MEM_STATS_AVAIL, mem::next, mem::prev, ram, SIZEOF_STRUCT_MEM, sys_mutex_new(), and mem::used.
Referenced by lwip_init().
void* mem_malloc | ( | mem_size_t | size | ) |
Adam's mem_malloc() plus solution for bug #17922 Allocate a block of memory with a minimum of 'size' bytes.
size | is the minimum size of the requested block in bytes. |
Note that the returned value will always be aligned (as defined by MEM_ALIGNMENT).
Definition at line 493 of file mem.c.
References LWIP_ASSERT, LWIP_DBG_LEVEL_SERIOUS, LWIP_DEBUGF, LWIP_MEM_ALIGN_SIZE, LWIP_MEM_ALLOC_DECL_PROTECT, LWIP_MEM_ALLOC_PROTECT, LWIP_MEM_ALLOC_UNPROTECT, MEM_ALIGNMENT, MEM_DEBUG, MEM_SIZE_ALIGNED, MEM_STATS_INC, MEM_STATS_INC_USED, MIN_SIZE_ALIGNED, mem::next, NULL, mem::prev, S16_F, SIZEOF_STRUCT_MEM, sys_mutex_lock(), sys_mutex_unlock(), and mem::used.
Referenced by mem_calloc(), and pbuf_alloc().
void* mem_trim | ( | void * | rmem, |
mem_size_t | newsize | ||
) |
Shrink memory returned by mem_malloc().
rmem | pointer to memory allocated by mem_malloc the is to be shrinked |
newsize | required size after shrinking (needs to be smaller than or equal to the previous size) |
Definition at line 368 of file mem.c.
References LWIP_ASSERT, LWIP_DBG_LEVEL_SEVERE, LWIP_DEBUGF, LWIP_MEM_ALIGN_SIZE, LWIP_MEM_FREE_DECL_PROTECT, LWIP_MEM_FREE_PROTECT, LWIP_MEM_FREE_UNPROTECT, MEM_DEBUG, MEM_SIZE_ALIGNED, MEM_STATS_DEC_USED, MEM_STATS_INC, MIN_SIZE_ALIGNED, mem::next, NULL, mem::prev, ram, SIZEOF_STRUCT_MEM, SYS_ARCH_DECL_PROTECT, SYS_ARCH_PROTECT, SYS_ARCH_UNPROTECT, and mem::used.
Referenced by pbuf_realloc().
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static |
"Plug holes" by combining adjacent empty struct mems. After this function is through, there should not exist one empty struct mem pointing to another empty struct mem.
mem | this points to a struct mem which just has been freed |
Definition at line 235 of file mem.c.
References LWIP_ASSERT, MEM_SIZE_ALIGNED, mem::next, mem::prev, and mem::used.
Referenced by mem_free().
struct mem __ATTRIB_PACK |
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static |
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pointer to the heap (ram_heap): for alignment, ram is now a pointer instead of an array
Definition at line 188 of file mem.c.
Referenced by mem_init(), and mem_trim().
u8_t ram_heap [MEM_SIZE_ALIGNED + (2*SIZEOF_STRUCT_MEM) + MEM_ALIGNMENT SHMEM_ATTR) |
If you want to relocate the heap to external memory, simply define LWIP_RAM_HEAP_POINTER as a void-pointer to that location. If so, make sure the memory at that location is big enough (see below on how that space is calculated). the heap. we need one struct mem at the end and some room for alignment