| 摘要 |
A data processing system includes a plurality of transaction masters (4, 6, 8, 10) each with an associated local cache memory (12, 14, 16, 18) and coupled to coherent interconnect circuitry (20). Monitoring circuitry (24) within the coherent interconnect circuitry (20) maintains a state variable (flag) in respect of each of the transaction masters to monitor whether an exclusive store access state is pending for that transaction master. When a transaction master is to execute a store-exclusive instruction, then a current value of the subject state variable for that transaction master is compared with a previous value of that variable stored when the exclusive store access was setup. If there is a match, then store-exclusive instruction is allowed to proceed and the state variables of all other transaction masters for which there is a pending exclusive store access state are changed. If there is not a match, then the execution of the store-exclusive instruction is marked as failing. |
