Simple C++ Download class

[Andreas Volz <lists brachttal net>]

Hello,

for a special need a wrote a Download class with C++ and the help of
Glibmm thread. It creates a thread, downloads files in the background
and informs the caller after finishing. Optional I've a blocking mode to
wait until it finish in the caller thread.

I wrote a lot of unit tests for the class and all except one pass
(waitOnFinishTest blocks). After searching the problem for some days I'm
sticking a little.

Perhaps I used too much mutexes and conditions and the locking code
could be much simplified.

Download.h
http://pastebin.org/15720

Download.cpp:
http://pastebin.org/15718

DownloadTest.cpp
http://pastebin.org/15721

And here the unit test running log:
http://pastebin.org/15724

Perhaps someone could review my code and see a problem. I would be very
thankful for any hints.

regards
Andreas