memory.c File Reference

#include <isix/memory.h>
#include <isix/types.h>
#include <isix/semaphore.h>
#include <prv/semaphore.h>
#include <prv/scheduler.h>
#include <isix/printk.h>

Include dependency graph for memory.c:

Go to the source code of this file.

Data Structures
struct	header
Defines
#define	ISIX_DEBUG_MEMORY   ISIX_DBG_OFF
#define	MAGIC   0x19790822
#define	ALIGN_TYPE   void *
#define	ALIGN_MASK   (sizeof(ALIGN_TYPE) - 1)
#define	ALIGN_SIZE(p)   (((size_t)(p) + ALIGN_MASK) & ~ALIGN_MASK)
#define	LIMIT(p)
Functions
static void	mem_lock_init (void)
	Lock the memory.
static void	mem_lock (void)
	Lock the memory.
static void	mem_unlock (void)
	Unlock the memory.
void	isix_alloc_init (void)
	Initialize global heap.
void *	isix_alloc (size_t size)
void	isix_free (void *p)
size_t	isix_heap_free (int *fragments)
Variables
struct {
struct header   free
}	heap
static sem_t	mem_sem
	Semaphore for locking the memory allocator.

---

Define Documentation

#define ALIGN_MASK   (sizeof(ALIGN_TYPE) - 1)

Definition at line 31 of file memory.c.

#define ALIGN_SIZE

(

p

)

(((size_t)(p) + ALIGN_MASK) & ~ALIGN_MASK)

Definition at line 32 of file memory.c.

Referenced by isix_alloc().

#define ALIGN_TYPE   void *

Definition at line 30 of file memory.c.

#define ISIX_DEBUG_MEMORY   ISIX_DBG_OFF

Definition at line 17 of file memory.c.

#define LIMIT

(

p

)

Value:

(struct header *)((char *)(p) + \
                                   sizeof(struct header) + \
                                   (p)->h_size)

Definition at line 137 of file memory.c.

Referenced by isix_free().

#define MAGIC   0x19790822

Definition at line 29 of file memory.c.

Referenced by isix_alloc().

---

Function Documentation

void* isix_alloc

(

size_t

size

)

Allocate the memory from the global heap

Parameters:

[in]

size

Allocated size

Returns:

Pointer to the allocated area otherwise NULL

Definition at line 99 of file memory.c.

References ALIGN_SIZE, header::h, header::h_magic, header::h_next, header::h_size, heap, MAGIC, mem_lock(), mem_unlock(), and NULL.

Referenced by isix_fifo_create(), isix_init(), isix_sem_create_limited(), isix_task_create(), and isix_vtimer_create().

void isix_alloc_init

(

void

)

Initialize global heap.

Definition at line 80 of file memory.c.

References header::h, header::h_next, header::h_size, heap, mem_lock_init(), and NULL.

Referenced by isix_init().

void isix_free

(

void *

mem

)

Free alocated earlier memory area param[in] mem Pointer to the allocated memory

Definition at line 142 of file memory.c.

References header::h, header::h_next, header::h_size, heap, LIMIT, mem_lock(), mem_unlock(), and NULL.

Referenced by cleanup_tasks(), isix_fifo_create(), isix_fifo_destroy(), isix_sem_destroy(), isix_task_create(), and isix_vtimer_destroy().

size_t isix_heap_free

(

int *

fragments

)

Function display current memory usage

Parameters:

[out]

fragments

- return number of fragments mem

Returns:

free memory space

Definition at line 185 of file memory.c.

References heap, mem_lock(), and mem_unlock().

static void mem_lock

(

void

)

[static]

Lock the memory.

Definition at line 64 of file memory.c.

References isix_scheduler_running, isix_sem_wait(), isix::ISIX_TIME_INFINITE, and mem_sem.

Referenced by isix_alloc(), isix_free(), and isix_heap_free().

static void mem_lock_init

(

void

)

[static]

Lock the memory.

Definition at line 57 of file memory.c.

References isix::isix_sem_create(), and mem_sem.

Referenced by isix_alloc_init().

static void mem_unlock

(

void

)

[static]

Unlock the memory.

Definition at line 72 of file memory.c.

References isix_scheduler_running, isix::isix_sem_signal(), and mem_sem.

Referenced by isix_alloc(), isix_free(), and isix_heap_free().

---

Variable Documentation

struct header free

Definition at line 46 of file memory.c.

Referenced by port_cleanup_task().

struct { ... } heap [static]

Referenced by isix_alloc(), isix_alloc_init(), isix_free(), and isix_heap_free().

sem_t mem_sem [static]

Semaphore for locking the memory allocator.

Definition at line 52 of file memory.c.

Referenced by mem_lock(), mem_lock_init(), and mem_unlock().