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The C and C++ Libraries

4.8.4 __Heap_Initialize()

Initializes the heap.

Syntax

void __Heap_Initialize(struct __Heap_Descriptor*h)

Implementation

This is called at initialization. You must redefine it toset up the fields in your heap

descriptor structure to correct initial values. A typical linked-list heap initializes the

first_free_block pointer to

NULL

to indicate that there are no free blocks in the heap.

4.8.5 __Heap_DescSize()

Returns the size of the

__Heap_Descriptor

structure.

Syntax

int __Heap_DescSize(int 0)

Implementation

This is called at initialization. It must return the sizeof your heap descriptor structure.

In almost all cases the implementation in Example 4-18 is sufficient.

Example 4-18 Heap_DescSize

extern int __Heap_DescSize(int zero) {return sizeof(__Heap_Descriptor);}

This routine is required so that the library initialization can find an initial piece of

memory big enough to be the heap descriptor.

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