Single-Heap Support

Languages that do not have intrinsic multiple-heap storage support use the default single-level storage heap. You cannot use the Discard Heap (CEEDSHP), the Mark Heap (CEEMKHP), or the Release Heap (CEERLHP) bindable APIs with the default heap. You can free dynamic storage that is allocated by the default heap by using explicit free operations, or by ending the activation group that owns it.

These restrictions on the use of the default heap help prevent inadvertent release of allocated dynamic storage in mixed-language applications. Remember to consider release heap and discard heap operations as insecure for large applications that re-use existing code with potentially different storage support. Remember not to use release heap operations that are valid for the default heap. This causes multiple parts of an application that uses the mark function correctly when used separately to possibly fail when used together.