Inside Macintosh: Memory /

Chapter 2 - Memory Manager / Memory Manager Reference

Memory Manager Routines / Allocating and Releasing Relocatable Blocks of Memory

NewEmptyHandleSys

If you want to initialize a handle in the system heap but not allocate any space for it, use the NewEmptyHandleSys function. The Resource Manager uses this function extensively, but you probably won't need to use it.

FUNCTION NewEmptyHandleSys: Handle;

DESCRIPTION

The NewEmptyHandleSys function initializes a new handle in the system heap by allocating a master pointer for it, but it does not allocate any memory for the handle to control. NewEmptyHandleSys sets the handle's master pointer to NIL.

SPECIAL CONSIDERATIONS

Because NewEmptyHandleSys might need to call the MoreMasters procedure to allocate new master pointers, it might allocate memory. Thus, you should not call NewEmptyHandleSys at interrupt time.

ASSEMBLY-LANGUAGE INFORMATION

The registers on exit for NewEmptyHandleSys are

Registers on exit
A0	Address of the new block's master pointer
D0	Result code

RESULT CODES

noErr	0	No error
memFullErr	-108	Not enough memory

SEE ALSO

When you want to allocate memory for the empty handle, use the ReallocateHandle procedure, described on page 2-52.