Variables. A variable is a symbolic name for (or reference to) information. The variable's name represents what information the variable contains. They are called variables because the represented information can change but the operations on the variable remain the same. In general, a program should be written with Symbolic notation, such that a statement is always true symbolically.
Definition of overwatch. 1  1 archaic : to weary or exhaust by keeping awake. 2  2a obsolete : to watch through or throughout (as the night) b : to watch over. 3  3 : to support by fire another element which is moving tanks overwatching an assault battalion.
Interruption is a cooperative mechanism. When one thread interrupts another, the interrupted thread does not necessarily stop what it is doing immediately. Instead, interruption is a way of politely asking another thread to stop what it is doing if it wants to, at its convenience.