[ros-dev] free handle table entries

[Hartmut Birr]

Hi,

currently the free handle entry list is a lifo list. This is not a good
solution for process and thread ids because a id from a currently
deleted process or thread is valid again after a very short time. I
would like it to change the free list to a fifo list by using a double
linked list. The u2 part of  an entry has enough room for a list entry
instead an index.

- Hartmut