sax: my suggestion was not as good as i thought...

... as indicated by the failing unit test.

Change-Id: I1a8a8b933b10673e71261726dc8887dfe1d3e2ee
svtools: add some missing locks in new code

Change-Id: I6f000fb0f205b437e4ff5238c8ede5735c403077
accessibility: add some missing locks in new code

Change-Id: Ic38a07c592a89973ca1df807505f87910e84a17f
sd: add some missing locks in new code

Change-Id: Id0efc9a0e108886c261e75bc109e090a16fba960
sc: add some missing locks in new code

Change-Id: Ia35693f6c5915e898e5b137920431c7bebfc761c