The M9 pistol uses an "oscillating Block" locking system. At the moment of firing, the slide and barrel are locked together. They are both driven rearward by recoil- but after about 3mm of travel,...
Refrigerator Must Open if Used. Despite the model or a technology incorporated of a particular refrigerator, user has to open its doors to store or take out the goods. When the door remains open,...
here the locking means is that the resource has been acquired on particular data(table) and that resource can not used by another transaction till it locked by any other transaction.