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    • 4. 发明授权
    • Method and apparatus for locking shared memory locations in
multiprocessing systems
    • 用于锁定多处理系统中的共享存储器位置的方法和装置
    • US5535365A
    • 1996-07-09
    • US141259
    • 1993-10-22
    • Frank R. BarriusoDouglas M. PaseDavid J. Sielaff
    • Frank R. BarriusoDouglas M. PaseDavid J. Sielaff
    • G06F9/46G06F12/00
    • G06F9/526G06F9/52
    • A method of synchronizing accesses to shared data in a multiprocessing system having an atomic swap capability. A distinguished lock value is defined. A processor which wishes to access a shared data memory location performs an atomic swap of the lock value to the shared data memory location. If the data received from the atomic swap is equivalent to the lock value the processor knows that the memory location has been locked by another processor. The processor then repeats the atomic swap at intervals until data is received which is not equivalent to the lock value. The processor operates on the data and then performs a write to the shared data memory location to replace the lock value with the updated data. In an alternate embodiment, in situations where a unique lock value cannot be defined, an array is created to store lock values associated with particular shared data memory locations. A processor seeking access to a shared data memory location performs atomic swaps of the lock value to the lock array to determine access to a shared data memory location.
    • 一种在具有原子交换能力的多处理系统中同步对共享数据的访问的方法。 定义了一个区别的锁定值。 希望访问共享数据存储器位置的处理器执行锁定值到共享数据存储器位置的原子交换。 如果从原子交换接收的数据等同于锁值,则处理器知道存储器位置已被另一个处理器锁定。 然后处理器以间隔重复原子交换,直到收到不等于锁定值的数据。 处理器对数据进行操作,然后对共享数据存储器位置进行写入,以用更新的数据替换锁定值。 在替代实施例中,在不能定义唯一锁定值的情况下,创建阵列以存储与特定共享数据存储器位置相关联的锁定值。 寻求访问共享数据存储器位置的处理器对锁定数组执行锁定值的原子交换以确定对共享数据存储器位置的访问。