GNU libmicrohttpd 0.9.77
|
memory pool More...
#include "memorypool.h"
#include <string.h>
#include <stdint.h>
#include "mhd_assert.h"
#include "mhd_limits.h"
Go to the source code of this file.
Macros | |
#define | _MHD_FALLBACK_PAGE_SIZE (4096) |
#define | MHD_DEF_PAGE_SIZE_ _MHD_FALLBACK_PAGE_SIZE |
#define | MAP_FAILED ((void*) -1) |
#define | ALIGN_SIZE (2 * sizeof(void*)) |
#define | ROUND_TO_ALIGN(n) |
#define | _MHD_NOSANITIZE_PTRS |
#define | _MHD_RED_ZONE_SIZE (0) |
#define | ROUND_TO_ALIGN_PLUS_RED_ZONE(n) ROUND_TO_ALIGN(n) |
#define | _MHD_POISON_MEMORY(pointer, size) (void)0 |
#define | _MHD_UNPOISON_MEMORY(pointer, size) (void)0 |
Functions | |
void | MHD_init_mem_pools_ (void) |
struct MemoryPool * | MHD_pool_create (size_t max) |
void | MHD_pool_destroy (struct MemoryPool *pool) |
size_t | MHD_pool_get_free (struct MemoryPool *pool) |
void * | MHD_pool_allocate (struct MemoryPool *pool, size_t size, bool from_end) |
void * | MHD_pool_try_alloc (struct MemoryPool *pool, size_t size, size_t *required_bytes) |
_MHD_NOSANITIZE_PTRS void * | MHD_pool_reallocate (struct MemoryPool *pool, void *old, size_t old_size, size_t new_size) |
_MHD_NOSANITIZE_PTRS void * | MHD_pool_reset (struct MemoryPool *pool, void *keep, size_t copy_bytes, size_t new_size) |
Variables | |
static size_t | MHD_sys_page_size_ |
memory pool
Definition in file memorypool.c.
#define _MHD_FALLBACK_PAGE_SIZE (4096) |
Fallback value of page size
Definition at line 62 of file memorypool.c.
#define _MHD_NOSANITIZE_PTRS |
Definition at line 100 of file memorypool.c.
#define _MHD_POISON_MEMORY | ( | pointer, | |
size | |||
) | (void)0 |
Definition at line 103 of file memorypool.c.
#define _MHD_RED_ZONE_SIZE (0) |
Definition at line 101 of file memorypool.c.
#define _MHD_UNPOISON_MEMORY | ( | pointer, | |
size | |||
) | (void)0 |
Definition at line 104 of file memorypool.c.
#define ALIGN_SIZE (2 * sizeof(void*)) |
Align to 2x word size (as GNU libc does).
Definition at line 90 of file memorypool.c.
#define MAP_FAILED ((void*) -1) |
Definition at line 84 of file memorypool.c.
#define MHD_DEF_PAGE_SIZE_ _MHD_FALLBACK_PAGE_SIZE |
Definition at line 69 of file memorypool.c.
#define ROUND_TO_ALIGN | ( | n | ) |
Round up 'n' to a multiple of ALIGN_SIZE.
Definition at line 95 of file memorypool.c.
#define ROUND_TO_ALIGN_PLUS_RED_ZONE | ( | n | ) | ROUND_TO_ALIGN(n) |
Definition at line 102 of file memorypool.c.
void MHD_init_mem_pools_ | ( | void | ) |
Initialise values for memory pools
Definition at line 136 of file memorypool.c.
References ALIGN_SIZE, mhd_assert, MHD_DEF_PAGE_SIZE_, and MHD_sys_page_size_.
Referenced by MHD_init().
void * MHD_pool_allocate | ( | struct MemoryPool * | pool, |
size_t | size, | ||
bool | from_end | ||
) |
Allocate size bytes from the pool.
pool | memory pool to use for the operation |
size | number of bytes to allocate |
from_end | allocate from end of pool (set to 'true'); use this for small, persistent allocations that will never be reallocated |
Definition at line 324 of file memorypool.c.
References _MHD_UNPOISON_MEMORY, mhd_assert, NULL, and ROUND_TO_ALIGN_PLUS_RED_ZONE.
struct MemoryPool * MHD_pool_create | ( | size_t | max | ) |
Create a memory pool.
max | maximum size of the pool |
Definition at line 197 of file memorypool.c.
References _MHD_POISON_MEMORY, ALIGN_SIZE, MAP_FAILED, mhd_assert, MHD_sys_page_size_, NULL, and ROUND_TO_ALIGN.
void MHD_pool_destroy | ( | struct MemoryPool * | pool | ) |
Destroy a memory pool.
pool | memory pool to destroy |
Definition at line 268 of file memorypool.c.
References _MHD_UNPOISON_MEMORY, mhd_assert, and NULL.
size_t MHD_pool_get_free | ( | struct MemoryPool * | pool | ) |
Check how much memory is left in the pool
pool | pool to check |
Definition at line 300 of file memorypool.c.
References _MHD_RED_ZONE_SIZE, and mhd_assert.
_MHD_NOSANITIZE_PTRS void * MHD_pool_reallocate | ( | struct MemoryPool * | pool, |
void * | old, | ||
size_t | old_size, | ||
size_t | new_size | ||
) |
Reallocate a block of memory obtained from the pool. This is particularly efficient when growing or shrinking the block that was last (re)allocated. If the given block is not the most recently (re)allocated block, the memory of the previous allocation may be not released until the pool is destroyed or reset.
pool | memory pool to use for the operation |
old | the existing block |
old_size | the size of the existing block |
new_size | the new size of the block |
Definition at line 423 of file memorypool.c.
References _MHD_POISON_MEMORY, _MHD_RED_ZONE_SIZE, _MHD_UNPOISON_MEMORY, mhd_assert, NULL, and ROUND_TO_ALIGN_PLUS_RED_ZONE.
_MHD_NOSANITIZE_PTRS void * MHD_pool_reset | ( | struct MemoryPool * | pool, |
void * | keep, | ||
size_t | copy_bytes, | ||
size_t | new_size | ||
) |
Clear all entries from the memory pool except for keep of the given size. The pointer returned should be a buffer of new_size where the first copy_bytes are from keep.
pool | memory pool to use for the operation |
keep | pointer to the entry to keep (maybe NULL) |
copy_bytes | how many bytes need to be kept at this address |
new_size | how many bytes should the allocation we return have? (should be larger or equal to copy_bytes) |
Size of area to zero-out
Definition at line 514 of file memorypool.c.
References _MHD_POISON_MEMORY, _MHD_UNPOISON_MEMORY, mhd_assert, MHD_sys_page_size_, NULL, and ROUND_TO_ALIGN_PLUS_RED_ZONE.
void * MHD_pool_try_alloc | ( | struct MemoryPool * | pool, |
size_t | size, | ||
size_t * | required_bytes | ||
) |
Try to allocate size bytes memory area from the pool.
If allocation fails, required_bytes is updated with size required to be freed in the pool from rellocatable area to allocate requested number of bytes. Allocated memory area is always not rellocatable ("from end").
pool | memory pool to use for the operation | |
size | the size of memory in bytes to allocate | |
[out] | required_bytes | the pointer to variable to be updated with the size of the required additional free memory area, not updated if function succeed. Cannot be NULL. |
Definition at line 373 of file memorypool.c.
References _MHD_UNPOISON_MEMORY, mhd_assert, NULL, ROUND_TO_ALIGN, ROUND_TO_ALIGN_PLUS_RED_ZONE, and SIZE_MAX.
Referenced by connection_alloc_memory().
|
static |
Size of memory page
Definition at line 123 of file memorypool.c.
Referenced by MHD_init_mem_pools_(), MHD_pool_create(), and MHD_pool_reset().