Interrupt service program, that is, the program that the processor handles "urgent matters", can be understood as a service, which is completed by executing a specific program prepared in advance. This program dealing with "urgent matters" is called the interrupt service program.

For example, there are three warehouses, the warehouse numbers are11,222,333, and the corresponding keywords are11,222,333.

11/warehouse has rice, warehouse 222 has high-end sports cars, and warehouse 333 has wine.

One day,

You go shopping with friends (an ongoing project);

At this time, your rich dad asked you to go to warehouse 222 (the entrance to the interruption) and drive to find him (the interrupted order);

You have to listen to your father (execution interruption);

Find Warehouse 222 (interrupted entrance), and there are no sports cars at other entrances11and 333;

Drive in front of dad, then go shopping with friends;