| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide efficient means to clear a semaphore reservation.SOLUTION: Semaphore operation 116 manages exclusive access to a memory 114 that is shared by a plurality of processing elements. A semaphore reservation status for exclusive access by a processing element is monitored by a memory controller. To clear an old reservation status, a command signal is transmitted for a write operation to the memory while prohibiting update of contents of the memory. The reservation status at the controller 104 is changed from a reservation state to a non-reservation state in response to receipt of the command signal.</p> |
