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    • 7. 发明授权
    • Apparatus and method for ensuring that lock requests are serviced in a
multiprocessor system
    • 用于确保在多处理器系统中服务锁定请求的装置和方法
    • US5341491A
    • 1994-08-23
    • US141427
    • 1993-10-22
    • Raj Ramanujan
    • Raj Ramanujan
    • G06F9/46G06F12/14
    • G06F9/524
    • A lockout avoidance circuit is provided for a plurality of nodes which generate lock requests for a shared resource such as a memory location. The circuit insures that lock requests are eventually satisfied. A lock queue includes a plurality of registers pipelined together. Lock requests only enter the lock queue if they are refused access to a shared resource a predetermined number of times. A first register is the head of the queue and the last register is the bottom of the queue. An enabling circuit allows the queue to store in the registers lock requests received from the different nodes in the order in which they are initially refused service. The enabling circuit operates the queue by pushing the stored lock requests toward the head of the queue each time the head entry in the queue is serviced. The lockout avoidance circuit is implemented at each level of the system wherein a lockout condition can occur.
    • 为多个节点提供闭锁避免电路,这些节点产生对诸如存储器位置的共享资源的锁定请求。 电路确保最终满足锁定请求。 锁定队列包括流水线化的多个寄存器。 锁定请求仅在预定次数被拒绝访问共享资源时才进入锁定队列。 第一个寄存器是队列的头,最后一个寄存器是队列的底部。 启用电路允许队列以其最初被拒绝服务的顺序存储在寄存器中锁定从不同节点接收的请求。 启用电路通过在每次服务队列中的头条目时将存储的锁定请求推送到队列的头部来操作队列。 锁定避免电路在系统的每个级别实现,其中可能发生锁定状态。
    • 10. 发明授权
    • Method and apparatus for sharing data between processors in a computer
system
    • 用于在计算机系统中的处理器之间共享数据的方法和装置
    • US5263144A
    • 1993-11-16
    • US546508
    • 1990-06-29
    • John H. ZurawskiRaj RamanujanJohn De Rosa
    • John H. ZurawskiRaj RamanujanJohn De Rosa
    • G06F12/08G06F13/14
    • G06F12/0831
    • A cache coherency scheme in a multiprocessor computer system allows data sharing between caches at a fast rate. A new cache coherency state is introduced which allows a processor pair to more effectively share data and eliminate bus transfers thereby improving system throughput. The transfer of data is accomplished by the returning a portion of a preselected data block pursuant to either a read or a read for ownership request by a first one of the processors of the processor pair by the second processor of the processor pair. The ownership of the portion of the preselected data block is shared by the processor pair. Both processors set an indicator to denote that the preselected data block is an incomplete data block.
    • 多处理器计算机系统中的高速缓存一致性方案允许以高速率在高速缓存之间进行数据共享。 引入了新的高速缓存一致性状态,允许处理器对更有效地共享数据并消除总线传输,从而提高系统吞吐量。 通过处理器对的第二处理器由处理器对的第一处理器的所有权请求的读取或读取来返回预选数据块的一部分来实现数据的传送。 预选数据块的部分的所有权由处理器对共享。 两个处理器设置一个指示符,表示预先选择的数据块是不完整的数据块。