This requires fixing the test on Windows: QMutex internally uses
WaitForSingleObjectEx which can wake up early, according to the system
timer resolution:
https://msdn.microsoft.com/en-us/library/windows/desktop/ms687069(v=vs.85).aspx#waitfunctionsandtime-outintervals
QTime must be so slow that it hides the early wakes, but QElapsedTimer is
accurate enough to make the test fail unless we add back some tolerance to
compensate for the early wakeups.
Change-Id: I20b38af9c87a0b0e38a19b9bff1c3c24975c78f5
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
7814bf126a