C Library Functions: Dynamic Memory Management

Allocating and Freeing Memory

Function Header File Description
_alloca stdlib.h
malloc.h
builtin.h
Temporarily allocates storage space from the program's stack.
calloc stdlib.h
malloc.h
Reserves storage space for an array and initializes the values of all elements to 0.
_debug_calloc stdlib.h
malloc.h
Allocates memory and initializes it to 0, checks the heap, and stores information about the allocation.
_debug_free stdlib.h
malloc.h
Releases memory, checks the heap, and stores information about the operation.
_debug_heapmin stdlib.h
malloc.h
Returns unused memory in the heap to the operating system, and stores information about the operation.
_debug_malloc stdlib.h
malloc.h
Allocates memory and initializes it to 0xAA , checks the heap, and stores information about the allocation.
_debug_realloc stdlib.h
malloc.h
Changes the size of an allocated memory block, sets unused memory to 0xAA , checks the heap, and stores information about the operation.
_debug_tcalloc stdlib.h
malloc.h
Allocates tiled memory and initializes it to 0, checks the heap, and stores information about the allocation.
_debug_tfree stdlib.h
malloc.h
Releases tiled memory, checks the heap, and stores information about the operation.
_debug_theapmin stdlib.h
malloc.h
Returns unused memory in the tiled heap to the operating system, and stores information about the operation.
_debug_tmalloc stdlib.h
malloc.h
Allocates tiled memory and initializes it to 0xAA , checks the heap, and stores information about the allocation.
_debug_trealloc stdlib.h
malloc.h
Changes the size of an allocated tiled memory block, initializes unused memory to 0xAA , checks the heap, and stores information about the operation.
_debug_ucalloc stdlib.h
malloc.h
Allocates memory from a specified heap and initializes it to 0 , checks the heap, and stores information about the allocation.
_debug_uheapmin stdlib.h
malloc.h
Returns unused memory from a specified heap to the operating system, and stores information about the operation.
_debug_umalloc stdlib.h
malloc.h
Allocates memory from a specified heap and initializes it to 0xAA, checks the heap, and stores information about the allocation.
free stdlib.h
malloc.h
Frees storage blocks.
_heapmin stdlib.h
malloc.h
Returns all unused memory from the runtime heap to the operating system.
malloc stdlib.h
malloc.h
Allocates memory blocks. Reserves storage blocks.
realloc stdlib.h
malloc.h
Changes storage size allocated for an object.
_tcalloc stdlib.h
malloc.h
Allocates tiled memory and initializes it to 0.
_tfree stdlib.h
malloc.h
Releases tiled memory.
_theapmin stdlib.h
malloc.h
Returns all unused memory from the tiled runtime heap to the operating system.
_tmalloc stdlib.h
malloc.h
Allocates a block of tiled memory.
_trealloc stdlib.h
malloc.h
Changes the size of an allocated tiled memory block.

Heap Information and Checking

Function Header File Description
_dump_allocated stdlib.h
malloc.h
Writes information about currently allocated memory blocks.
_dump_allocated_delta stdlib.h
malloc.h
Writes information about currently allocated memory
_heap_check stdlib.h
malloc.h
Validates all allocated memory blocks.
_heapchk malloc.h Validates all allocated and freed objects on the default heap.
_heapset malloc.h Validates all allocated and freed objects on the default heap, and sets all free memory to a specified value.
_heap_walk malloc.h Returns information about allocated and freed objects on the default heap.
_mheap umalloc.h Finds out which heap an object was allocated from.
_msize stdlib.h
malloc.h
Returns the size of an allocated block.
_tdump_allocated stdlib.h
malloc.h
Writes information about currently allocated memory blocks from the tiled heap.
_tdump_allocated_delta malloc.h Writes information about currently allocated memory blocks from the tiled heap since the last call for this information.
_theap_check stdlib.h
malloc.h
Validates all allocated blocks of tiled memory.
_udump_allocated umalloc.h Writes information about currently allocated memory blocks from a specified heap.
_udump_allocated_delta umalloc.h Writes information about currently allocated memory blocks from a specified heap since the last call for this information.
_uheap_check umalloc.h Validates all allocated memory blocks from a specified heap.
_uheapchk umalloc.h Validates all allocated and freed objects on a specified heap.
_uheapset umalloc.h Validates all allocated and freed objects on a specified heap, and sets all free memory to a specified value.
_uheap_walk umalloc.h Returns information about allocated and freed objects on a specified heap.
_ustats umalloc.h Gets information about a specified heap.

Heap Creation and Management

Function Header File Description
_uaddmem umalloc.h Adds memory to a specified heap.
_uclose umalloc.h Closes a heap so it can no longer be used.
_ucreate umalloc.h Creates a heap of memory.
_udefault umalloc.h Changes the memory heap used as the default heap.
_udestroy umalloc.h Destroys a heap.
_uopen umalloc.h Opens a heap so it can be used.


Alphabetical Listing of IBM C and C++ Compilers Functions and Macros