C166 User's Guide

Memory Allocation Routines

Routine	Attributes	Description
_alloc_boxf	reentrant	Allocates a fixed size far block from the specified memory pool.
_calloc_boxh	reentrant	Allocates a fixed size huge block from the specified memory pool.
_alloc_boxn	reentrant	Allocates a fixed size near block from the specified memory pool.
_calloc_boxf	reentrant	Allocates a fixed size far block from the specified memory pool.
_calloc_boxh	reentrant	Releases a fixed size block from the specified huge memory pool.
_calloc_boxn	reentrant	Allocates a fixed size near block from the specified memory pool.
_free_boxf	reentrant	Frees a fixed size block that was allocated using _alloc_boxf or _calloc_boxf.
_free_boxh	reentrant	Frees a fixed size block that was allocated using _alloc_boxh or _calloc_boxh.
_free_boxn	reentrant	Frees a fixed size block that was allocated using _alloc_boxn or _calloc_boxn.
_init_boxf	reentrant	Initializes the location and size of a far fixed block memory pool.
_init_boxh	reentrant	Initializes the location and size of a huge fixed block memory pool.
_init_boxn	reentrant	Initializes the location and size of a near fixed block memory pool.
calloc		Allocates storage for an array from the memory pool.
calloc_b		Allocates storage for an array from the xhuge memory pool.
free		Frees a memory block that was allocated using calloc, malloc, or realloc.
free_b		Frees a memory block that was allocated using calloc_b, malloc_b, or realloc_b.
init_mempool		Initializes the memory location and size of the memory pool.
init_mempool_b		Initializes the memory location and size of the xhuge memory pool.
malloc		Allocates a block from the memory pool.
malloc_b		Allocates a block from the xhuge memory pool.
realloc		Reallocates a block from the memory pool.
realloc_b		Reallocates a block from the xhuge memory pool.

The memory allocation functions provide you with a means to specify, allocate, and free blocks of memory from a memory pool. Standard memory allocation functions are implemented as functions and are prototyped in the stdlib.h include file. Fixed block size memory allocation routines are prototyped in membox.h.

Before using any of these functions to allocate memory, you must first specify the size and location of the memory pool using the init_mempool routine or the size, location, and block size using the _init_box? routines. All memory requests are satisfied from the specified memory block.

The calloc, malloc, _alloc_box?, and _calloc_box? routines allocate blocks of memory from the pool. The calloc routine allocates an array with a specified number of elements of a given size and initializes the array to 0. The malloc routine allocates a specified number of bytes. The _alloc_box? and _calloc_box? routines allocate a single fixed-size block from the memory pool.

The realloc routine changes the size of an allocated block. The free and _free_box? routines return a previously allocated memory block to the memory pool.

C166 User's Guide

Memory Allocation Routines

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