Comment 12 for bug 481512

Hi, sorry to be the bearer of bad news but the fix Henning did introduces another issue recorded in bug 861742 (now a duplicate of this)

So we're going to have to examine other ways of achieving the goal - e.g.
 - fixing CPython to not segfault on concurrent operations on the filehandle
 - using locking but not doing the rotation in the signal handler, instead doing it on the next lock operation to notice the rotation request