SYNCHRONIZATION METHOD, MULTI-CORE PROCESSOR SYSTEM, AND SYNCHRONIZATION SYSTEM

摘要

An objective of the present invention is to avoid performance declines which occur because of redundant synchronization processes. When a synchronization point is reached at a time (t1), a CPU (#0) transmits a synchronization signal to a CPU (#1) and a CPU (#2). Given that the CPU (#1) and the CPU (#2) are in critical sections at the time (t1), the synchronization signal cannot be received. Next, at a time (t2), upon receipt of the synchronization signal, the CPU (#2), carries out a speculative execution with a copy destination shared memory region (104) which is a copy of a shared memory region (103) as an access destination thereof, while transmitting a ready signal to the CPU (#0) and the CPU (#1). At a time (t3), upon receipt of the synchronization signal, the CPU (#1) transmits the ready signal to the CPU (#0) and the CPU (#2). Upon receipt of the ready signal, the CPU (#2) assesses whether the synchronization process is redundant by comparing the data in the shared memory region (103) with the data in the copy destination shared memory region (104).