PURPOSE: To simplify constitution for dual switching control and improve the reliability by performing both transfer processing of transmission/reception and communication processing for data between programs through an operating system.
CONSTITUTION: Through the queuing means 17 on a stand-by side processor device MD2, program execution memory means 12 in mutual processor devices write data in an addresses designated by their own memories each time an application program calls the OS. Then the same addresses of the memories in the other party's processor devices are checked and waiting is made until some data is written from the control-side processor device MD1. Once it is confirmed that some data is written, the data in the memory means 12 in the other party's processor device are cleared and the waiting is made till the clearing of the data in its own memory means 12. The queuing means 17 of the control-side processor device MD1 performs similar processing.
ITO HIROKI
AKAI SO
MATSUDA TOSHIHIKO
