Getting All Instances of a Thread-Local

[dsimcha]

Using D2's builtin thread-local storage, is there a way to get all instances
(one per thread) of a given thread-local variable?  If not, can anyone
recommend any workarounds, given that:

1.  Each instance of this variable is not written to after initialization,
i.e. not more than once during the execution of the program.
2.  I must be able to tell instances created by threads that are still alive
from those created by dead threads.  This rules out simply appending the
values to an array.