To ensure that the rw-lock continues to work as
expected add a test which spins up a large number
of threads and then has them content on a single
lock and has those threads record if another thread is
also active in the same critical region. Each thread then
sleeps (while in critical region) and then releases. This
repeats for up to 5 seconds and then finishes; at that point
there should have been no simultaneous access (if there was
this would indicate the rw-lock is broken).
Change-Id: Ia293dda989ad924be3daca01eb79ca04bf60c79b
89087fd11d