| 摘要 |
PROBLEM TO BE SOLVED: To prevent deadlock in distributed processing. SOLUTION: When a consignor machine 1 transmits instruction to a consignee machine 2 with exclusive lock, the consignee machine 2 determines whether to be locked after receiving the instruction, and when it is already locked, the consignee machine 2, notifies the consignor machine 1 of retry. Since the consignor machine 1 releases locking and retries an instruction relay by re-locking, even if both the machines generate instructions almost simultaneously, the deadlock can be easily avoided. COPYRIGHT: (C)2008,JPO&INPIT
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