PROCESS PAIR EXECUTION CONTROL METHOD AND PROCESS PAIR EXECUTION CONTROL PROGRAM IN FAULT TOLERANT SYSTEM, AND FAULT TOLERANT SYSTEM

摘要

PPROBLEM TO BE SOLVED: To utilize an open system without requiring CPU resource double. PSOLUTION: A checkpoint collecting part 15 conducts a reading-out D of the condition of a primary process 11 every time when a checkpoint collection time comes, and executes a copy E to a backup process 12. If this backup process 12 is in an execution state, the checkpoint obtaining part 15 stops the process 12 by an instruction F to a backup process execution state control part 17. A process-issue system call detecting part 19 restarts the process 12 from the latest obtained checkpoint, and brings it into an execution by an instruction G to the backup process execution state control part 17 if the backup process 12 is stopped when a system call is issued from the primary process 11. PCOPYRIGHT: (C)2004,JPO