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Single-Level Storage Heap Interfaces

Single-Level Storage Heap Interfaces

Single-Level Storage Heap Interfaces

Bindable APIs are provided for all heap operations. Applications can be written using either the bindable APIs, language-intrinsic functions, or both.

The bindable APIs fall into the following categories:

  • Basic heap operations. These operations can be used on the default heap and on user-created heaps.
    • The Free Storage (CEEFRST) bindable API frees one previous allocation of heap storage.
    • The Get Heap Storage (CEEGTST) bindable API allocates storage within a heap.
    • The Reallocate Storage (CEECZST) bindable API changes the size of previously allocated storage.
  • Extended heap operations. These operations can be used only on user-created heaps.
    • The Create Heap (CEECRHP) bindable API creates a new heap.
    • The Discard Heap (CEEDSHP) bindable API discards an existing heap.
    • The Mark Heap (CEEMKHP) bindable API returns a token that can be used to identify heap storage to be freed by the CEERLHP bindable API.
    • The Release Heap (CEERLHP) bindable API frees all storage allocated in the heap since the mark was specified.
  • Heap allocation strategies
    • The Define Heap Allocation Strategy (CEE4DAS) bindable API defines an allocation strategy that determines the attributes for a heap created with the CEECRHP bindable API.

For information about the storage management APIs, see the API topic collection in the Programming category of the IBM® i Information Center.