heap_2.c File Reference

#include <stdlib.h>
#include "FreeRTOS.h"
#include "task.h"

Go to the source code of this file.

Classes
union	xRTOS_HEAP
struct	A_BLOCK_LINK

Macros
#define	MPU_WRAPPERS_INCLUDED_FROM_API_FILE
#define	heapMINIMUM_BLOCK_SIZE   ( ( size_t ) ( heapSTRUCT_SIZE * 2 ) )
#define	prvInsertBlockIntoFreeList(pxBlockToInsert)
#define	prvHeapInit()

Typedefs
typedef struct A_BLOCK_LINK	xBlockLink

Functions
void *	pvPortMalloc (size_t xWantedSize)
void	vPortFree (void *pv)
size_t	xPortGetFreeHeapSize (void)
void	vPortInitialiseBlocks (void)

Macro Definition Documentation

#define heapMINIMUM_BLOCK_SIZE   ( ( size_t ) ( heapSTRUCT_SIZE * 2 ) )

Definition at line 96 of file heap_2.c.

#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE

Definition at line 67 of file heap_2.c.

#define prvHeapInit

(

)

Value:

{                                                                                   \
xBlockLink *pxFirstFreeBlock;                                                       \
                                                                                    \
    /* xStart is used to hold a pointer to the first item in the list of free */    \
    /* blocks.  The void cast is used to prevent compiler warnings. */              \
    xStart.pxNextFreeBlock = ( void * ) xHeap.ucHeap;                               \
    xStart.xBlockSize = ( size_t ) 0;                                               \
                                                                                    \
    /* xEnd is used to mark the end of the list of free blocks. */                  \
    xEnd.xBlockSize = configTOTAL_HEAP_SIZE;                                        \
    xEnd.pxNextFreeBlock = NULL;                                                    \
                                                                                    \
    /* To start with there is a single free block that is sized to take up the      \
    entire heap space. */                                                           \
    pxFirstFreeBlock = ( void * ) xHeap.ucHeap;                                     \
    pxFirstFreeBlock->xBlockSize = configTOTAL_HEAP_SIZE;                           \
    pxFirstFreeBlock->pxNextFreeBlock = &xEnd;                                      \
}

Definition at line 133 of file heap_2.c.

#define prvInsertBlockIntoFreeList

(

pxBlockToInsert)

Value:

{                                                                                   \
xBlockLink *pxIterator;                                                             \
size_t xBlockSize;                                                                  \
                                                                                    \
    xBlockSize = pxBlockToInsert->xBlockSize;                                       \
                                                                                    \
    /* Iterate through the list until a block is found that has a larger size */    \
    /* than the block we are inserting. */                                          \
    for( pxIterator = &xStart; pxIterator->pxNextFreeBlock->xBlockSize < xBlockSize; pxIterator = pxIterator->pxNextFreeBlock ) \
    {                                                                               \
        /* There is nothing to do here - just iterate to the correct position. */   \
    }                                                                               \
                                                                                    \
    /* Update the list to include the block being inserted in the correct */        \
    /* position. */                                                                 \
    pxBlockToInsert->pxNextFreeBlock = pxIterator->pxNextFreeBlock;                 \
    pxIterator->pxNextFreeBlock = pxBlockToInsert;                                  \
}

Definition at line 112 of file heap_2.c.

Typedef Documentation

typedef struct A_BLOCK_LINK xBlockLink

Function Documentation

void* pvPortMalloc

(

size_t

xWantedSize)

Definition at line 154 of file heap_2.c.

void vPortFree

(

void *

pv)

Definition at line 244 of file heap_2.c.

void vPortInitialiseBlocks

(

void

)

Definition at line 275 of file heap_2.c.

size_t xPortGetFreeHeapSize

(

void

)

Definition at line 269 of file heap_2.c.