Tcl

Since 8.4.7 in an attempt to cleanup properly after calling
Tcl_Finalize(), a large memory waste has been opened
when Tcl-lib generated threads exit. This is observed on
threaded builds (--enable-threads) and only in the default
threaded memory allocator (-DUSE_THREAD_ALLOC=1).
This is not a memory leak per-se, hence it is not simple to
verify this with memory-leak analysis tools like e.g.
Purify.

To reproduce, compile Tcl library with threads enabled,
checkout and compile the Tcl threading extension and
try out this commands:

package req Thread
time {thread::join [thread::create -joinable ""]} 10000

while observing the process virtual/resident memory usage
(using the "top" utility or similar) .