Hi,

in my application I use a heap memory with code of "heap4". I have the need to use the "realloc" function to provide a already allocated memory area. I have write a wrapper to this function on "heap4" but I realized now that I do not know the size of the old allocation to copy the old content to the new memory area.

There is a function "mallocusablesize" that returns this value but how implement this routine in "heap_4" ?

You can know the size of a memory block allocated by vPortMalloc ?

Thanks very much.

debugasm

The size of every block is stored in a BlockLink_t structure, in the allocated block itself. See the implementation of vPortFree() for an example of how it is accessed.

I understand, thank you so much.

debugasm

To be precise:

~~~~ // The block is being returned to the heap - it is no longer allocated. block_size = (pxLink->xBlockSize & ~xBlockAllocatedBit) - xHeapStructSize; ~~~~

Obtain block size allocate by "pvPortMalloc" rounded to "BYTE_ALIGNMENT"

debugasm