The use of atomic weapons at the end of World War 2 fostered fears about their potential use during the Cold War years.
Interrupts and signals are low-level mechanisms that can alter the flow of control in a way similar to a subroutine, but usually occur as a response to some external stimulus or event (that can occur asynchronously), rather than execution of an 'in-line' control flow statement.
In such cases, you should use PL/SQL WHILE LOOP statement. A condition is a Boolean variable or expression that evaluates to a Boolean value of TRUE, FALSE or . The condition is checked at the beginning of each iteration. If the condition evaluates to TRUE, the sequence_of_statements is executed.