12-21-2012
Just a first thought. Is the lo interface up?
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Judy(3X) Judy(3X)
NAME
Judy functions - C libraries for creating and accessing dynamic arrays
SYNOPSIS
Judy1 - maps an Index (word) to a bit
JudyL - maps an Index (word) to a word
JudySL - maps an Index (string) to a word
DESCRIPTION
The Judy family of functions supports fully dynamic arrays. These arrays may be indexed by a 32- or 64-bit word (depending on the proces-
sor) or a string. A dynamic array that is sparsely populated can be thought of as a mapping function. There are 3 different Judy mappings
currently supported:
Judy1 maps an Index (word) to a bit.
JudyL maps an Index (word) to a word.
JudySL maps an Index (string) to a word.
For Judy1 functions and JudyL functions, Index should be declared as a Word_t type. Word_t is defined in the Judy.h header file as a 32-
or 64-bit unsigned native integer, and has the same number of bits as a pointer.
For JudySL functions, each index is a null-terminated string.
Judy arrays are both speed- and memory-efficient, with no tuning or configuration required, across a wide range of index set types (sequen-
tial, periodic, clustered, random). Judy's speed and memory usage are typically better than other data storage models such as skiplists,
binary trees, b-trees, or even hashing, and improves with very large data sets.
A Judy array is created merely by defining a null pointer and then storing (inserting) the first element into the array under that pointer.
The memory used by a Judy array is proportional to the population (number of elements).
Judy has two Application Program Interfaces (APIs): a C macro interface, and a function call interface. Because the macro forms are faster
and have a simpler error handling interface than the equivalent functions, they are the preferred way of calling the Judy functions.
Since an initial (empty) Judy array is represented by a null pointer, it is possible to construct an array of Judy arrays. In other words,
a Judy array's values (except Judy1) can be pointers to other Judy arrays.
AUTHOR
Judy was invented and implemented by Hewlett-Packard. (Note: Judy is named for the inventor's sister.)
FILES
Locations of interest include:
Documents, including HTML versions of the manual entries.
Demonstration program source files.
SEE ALSO
Judy1(3X), JudyL(3X), JudySL(3X),
the Judy website, http://www.hp.com/go/judy/, for more information and Application Notes.
Judy(3X)