Abstract: To provide a multiprocessor system in which data transmission efficiency is unlikely to be affected if a damaged processor should exist among a plurality of processors. The multiprocessor system has a plurality of processing modules, including a predetermined number, being three or more, of processors, and a bus for relaying data transmission among the respective processing modules, and specifies at least one damaged processor; selects as a communication restricted processor subjected to communication restriction at least one of the processors connected to the bus at a position determined according to a position where the damaged processor is connected to the bus; and restricts data transmission by the communication restricted processor via the bus.

Abstract: A system is provided having a group of processors which performs coordinated processing, wherein data is transferred to the group of processors or from the group of processors. When data is transferred from an input queue, a ring buffer, to the group of processors, an identifier adding unit adds an identifier to the data as a tag, the identifier indicating a block that contains this data in the input queue. When data processed by any one of the processors included in the group of processors is transferred to an output queue, a block selecting unit selects one of blocks of the output queue as a block for storing the data, the one corresponding to the tag added to this data.

Abstract: A buffer is provided with a leading pointer and a following pointer. A bitmap in which two bits are assigned to each block is updated to retain which states blocks are in, busy, write-completed, or read-completed. Under the constraint that the two pointers move in the same direction and do not pass each other: after the block designated by the leading pointer starts to be written, the leading pointer is moved to a next block only if the next block is in the read-completed state; and after the block designated by the following pointer starts to be read, the following pointer is moved to a next block only if the next block is in the write-completed state.

Abstract: To provide a multiprocessor system in which data transmission efficiency is unlikely to be affected if a damaged processor should exist among a plurality of processors. The multiprocessor system has a plurality of processing modules, including a predetermined number, being three or more, of processors, and a bus for relaying data transmission among the respective processing modules, and specifies at least one damaged processor; selects as a communication restricted processor subjected to communication restriction at least one of the processors connected to the bus at a position determined according to a position where the damaged processor is connected to the bus; and restricts data transmission by the communication restricted processor via the bus.

Abstract: A buffer is provided with a leading pointer and a following pointer. A bitmap in which two bits are assigned to each block is updated to retain which states blocks are in, busy, write-completed, or read-completed. Under the constraint that the two pointers move in the same direction and do not pass each other: after the block designated by the leading pointer starts to be written, the leading pointer is moved to a next block only if the next block is in the read-completed state; and after the block designated by the following pointer starts to be read, the following pointer is moved to a next block only if the next block is in the write-completed state.

Abstract: A system is provided having a group of processors which performs coordinated processing, wherein data is transferred to the group of processors or from the group of processors. When data is transferred from an input queue, a ring buffer, to the group of processors, an identifier adding unit adds an identifier to the data as a tags the identifier indicating a block that contains this data in the input queue. When data processed by any one of the processors included in the group of processors is transferred to an output queue, a block selecting unit selects one of blocks of the output queue as a block for storing the data, the one corresponding to the tag added to this data.