slab_pool.c File Reference

Implementation of the slab pool. More...

#include "slab_pool.h"
#include "esp_err.h"
#include "esp_log.h"
#include <string.h>

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Data Structures
struct	slab_node_t
	Slab Pool internal node structure. More...

Functions
static void	pool_lock_take (void)
	Lock pool.
static void	pool_lock_give (void)
	Unlock pool.
esp_err_t	slab_pool_init (void)
	Initialize slab pool.
slab_pool_t *	slab_pool_alloc (void)
	Allocate a slab from pool.
void	slab_pool_free (slab_pool_t *slab_ptr)
	Return slab to pool.
void	slab_pool_deinit (void)
	Deinitialize slab pool.

Variables
static const char *	TAG = "SLAB_POOL"
static slab_node_t	pool [SLAB_POOL_SIZE]
static slab_node_t *	free_list = NULL
static SemaphoreHandle_t	pool_lock = NULL
static bool	is_slab_pool_initialized = false

Detailed Description

Implementation of the slab pool.

• Uses a static pool of slabs
• Manage available slabs using singly linked list with a lock for mutual access
• On slab alloc returns list head if available
• On slab free make the returned slab the new head

Function Documentation

slab_pool_alloc()

slab_pool_t * slab_pool_alloc

(

void

)

Allocate a slab from pool.

Returns

slab_pool_t* pointer to slab on success otherwise NULL

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slab_pool_free()

void slab_pool_free

(

slab_pool_t *

slab_ptr

)

Return slab to pool.

Parameters

slab_ptr

Pointer to slab structure

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slab_pool_init()

esp_err_t slab_pool_init

(

void

)

Initialize slab pool.

Returns

esp_err_t Initialize result

Return values

ESP_OK	Initialize success
ESP_ERR_NO_MEM	No available memory for resource allocation
ESP_ERR_INVALID_STATE	Already initialized

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Variable Documentation

free_list

slab_node_t* free_list = NULL

static

Slab pool list head

is_slab_pool_initialized

bool is_slab_pool_initialized = false

static

Slab pool initialization state

pool

slab_node_t pool[SLAB_POOL_SIZE]

static

Slab pool list

pool_lock

SemaphoreHandle_t pool_lock = NULL

static

Slab pool list lock

TAG

const char* TAG = "SLAB_POOL"

static

Slab pool TAG name