About the memory allocate in customer module

I see that there is some API functions corresponding to allocate in AWE(like awe_fwAllocateHeaps), but there does not seem to be a corresponding memory free function(only can destroy the heap of the whole AWE instance like awe_fwDestroyHeaps).

The memory is only released uniformly during destroy.

This means that heap memory can only be allocated through adding variables or arrays in the "constructor" of the init method. 

I want to allocate heap memory as a temporary buffer during the process in the customer module, and release this memory after the process.

Is there a way to achieve this?