Drop the home-made solution with mutex and bool (which could have been
an atomic, but we have had a ready-made solution in QThread for a long
time).
Pick-to: 6.5 6.6
Change-Id: Id213a021f0ae94215afb28ff874fcb597dd1e6f9
Reviewed-by: MohammadHossein Qanbari <mohammad.qanbari@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Mikko Hallamaa <mikko.hallamaa@qt.io>
Reviewed-by: Ed Cooke
bd5c6fab40