Link error on taskHeadroom()

[mikep]

I cannot use System.TaskHeadRoom() in my code. The linker fails to find taskHeadroom in zxLib 2.5.2

[dkinzer]

[mikep]

I have tested the new ZX library code and it works fine on a ZX24n. Here is some empirical data about the relative size of task stacks. These numbers have no margin at all.

Task	ZVM Stack	Native Stack	Growth
Main	103	281	286%
Task1	32	63	197%
Task2	32	71	222%
Task3	72	100	139%
Task4	60	115	192%
Task5	36	85	236%

It is usual to have a ZVM stack margin of 10 bytes. I would suggest for a native mode device that this translates into a 30 byte margin. Here is some sample output from a ported native mode application using System.TaskHeadRoom()