If anyone wants to try on Win32, that's going to help.

fix #1570

Copyright changes. (btw, does Copyright the VideoLAN team really mean something? for example, in French law you can't give away copyright to someone else)

as we don't go through the object table and links.

[19bd84c7]

So we don't contend for the global structure lock all the time.

Introduced in the previous commit, pointed by Pierre. Thanks!

If it happens, there is a bug, and we'll assert in _yield.

Besides, we assert that this isn't the case right before...