System and method for implementing shared scalable nonzero indicators
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United States of America Patent
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Dec 9, 2014
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app pub date -
Nov 13, 2007
filing date -
Nov 13, 2007
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Abstract
A Scalable NonZero Indicator (SNZI) object in a concurrent computing application may include a shared data portion (e.g., a counter portion) and a shared nonzero indicator portion, and/or may be an element in a hierarchy of SNZI objects that filters changes in non-root nodes to a root node. SNZI objects may be accessed by software applications through an API that includes a query operation to return the value of the nonzero indicator, and arrive (increment) and depart (decrement) operations. Modifications of the data portion and/or the indicator portion may be performed using atomic read-modify-write type operations. Some SNZI objects may support a reset operation. A shared data object may be set to an intermediate value, or an announce bit may be set, to indicate that a modification is in progress that affects its corresponding indicator value. Another process or thread seeing this indication may “help” complete the modification before proceeding.
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