lwip-1.3.2/src/include/lwip/mem.h File Reference

#include "lwip/opt.h"

Macros
#define	LWIP_MEM_ALIGN(addr)   ((void *)(((mem_ptr_t)(addr) + MEM_ALIGNMENT - 1) & ~(mem_ptr_t)(MEM_ALIGNMENT-1)))
#define	LWIP_MEM_ALIGN_SIZE(size)   (((size) + MEM_ALIGNMENT - 1) & ~(MEM_ALIGNMENT-1))

Typedefs
typedef u16_t	mem_size_t

Functions
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. More...
void	mem_free (void *mem)
	Put a struct mem back on the heap. More...
void	mem_init (void)
	Zero the heap and initialize start, end and lowest-free. More...
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. More...
void *	mem_realloc (void *mem, mem_size_t size)
	In contrast to its name, mem_realloc can only shrink memory, not expand it. More...

#define LWIP_MEM_ALIGN

(

addr

)

((void *)(((mem_ptr_t)(addr) + MEM_ALIGNMENT - 1) & ~(mem_ptr_t)(MEM_ALIGNMENT-1)))

#define LWIP_MEM_ALIGN_SIZE

(

size

)

(((size) + MEM_ALIGNMENT - 1) & ~(MEM_ALIGNMENT-1))

typedef u16_t mem_size_t

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.

Parameters

count	number of objects to allocate
size	size of the objects to allocate

Returns

pointer to allocated memory / NULL pointer if there is an error

void mem_free

(

void *

rmem

)

Put a struct mem back on the heap.

Parameters

rmem	is the data portion of a struct mem as returned by a previous call to mem_malloc()

void mem_init

(

void

)

Zero the heap and initialize start, end and lowest-free.

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.

Parameters

size	is the minimum size of the requested block in bytes.

Returns

pointer to allocated memory or NULL if no free memory was found.

Note that the returned value will always be aligned (as defined by MEM_ALIGNMENT).

void* mem_realloc	(	void *	rmem,
		mem_size_t	newsize
	)

In contrast to its name, mem_realloc can only shrink memory, not expand it.

Since the only use (for now) is in pbuf_realloc (which also can only shrink), this shouldn't be a problem!

Parameters

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)

Returns

for compatibility reasons: is always == rmem, at the moment or NULL if newsize is > old size, in which case rmem is NOT touched or freed!

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, SIZEOF_STRUCT_MEM, SYS_ARCH_DECL_PROTECT, SYS_ARCH_PROTECT, SYS_ARCH_UNPROTECT, and mem::used.