Hook to allow iothread to drop the global mutex.
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7244 c046a42c-6fe2-441c-8c8c-71466251a162