Original commit message from CVS:
* testsuite/threads/Makefile.am:
* testsuite/threads/signals.c: (gst_test_get_type),
(gst_test_class_init), (gst_test_init), (gst_test_dispose),
(gst_test_set_property), (gst_test_get_property),
(gst_test_do_signal1), (signal2_handler), (gst_test_do_signal2),
(gst_test_do_prop), (run_thread), (main):
Added a bunch of testcases that show threadsafety bugs in glib.
