Abstract: An apparatus and method for monitoring and reporting optical symbol readability and operator and reader performance levels. The apparatus includes a reader for optical symbols which measures and reports the values of measurements with respect to the symbol and events occurring during the reading process indicative of the label readability. The apparatus further comprises data accumulation device including a memory storage to accumulate these measurement values for each set of labels, and a programmed computing system to analyze the measured values and report on the results of the analysis. A preferred method of monitoring and reporting optical symbol readability and operator and reader performance levels includes the steps of reading or attempting to read an optical symbol, performing measurements within the symbol and noting events during the reading process, accumulating these values, analyzing the accumulated data, and producing a report which lists the sets of labels which had readability problems.

Abstract: Segments of memory are allocated to a stack cache as needed to accommodate additional continuation frames during execution of a program. When a continuation is captured, flags in all segments of the stack cache are set to indicate the signals are shared by a captured continuation, the top segment of the stack cache is copied, and the copy is made the top continuation frame of the stack cache. To invoke a continuation, the top segment of the invoked continuation is copied into the current stack cache segment. When the stack cache is ready to underflow into a segment shared by a captured continuation, the shared segment is copied and the stack cache underflows into the copy.