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On Jan 9, 2011, at 6:28 AM, rpg400-l-request@xxxxxxxxxxxx wrote:
Yes. I was under that impression too, but at v5.4.0 linked list nodes ended up containing garbage after running realloc.
That could have happened at any time - I don't think v5.4 had anything to do with that. It would always have had that potential - the fact that the pointers were still valid shows that they were moved correctly. v5.4 probably just moved some stuff around that caused it to show up.
As others have noted, if you embed pointers to locations within the space then they will never be correct after moving the data. The memory allocation routines would not modify the pointers.
Any linked list that needs to grow in this manner should use offsets - which is much more efficient in storage terms anyway since pointers are 16 bytes long. It also means that the same logic can easily support linked lists in User Spaces. In your case, since User Spaces can grow as needed (to 16Mb anyway), it might have worked better for you than using dynamic memory.
Jon Paris
www.Partner400.com
www.SystemiDeveloper.com
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