Difference between revisions of "List space"
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The Nodes are relatively high-level structures and at ''[[Wikipedia:Runtime|runtime]]'' within the peer-nodes they sit upon a more fundamental layer called ''list space'' in which the actual nodal change takes place in a peer. | The Nodes are relatively high-level structures and at ''[[Wikipedia:Runtime|runtime]]'' within the peer-nodes they sit upon a more fundamental layer called ''list space'' in which the actual nodal change takes place in a peer. | ||
| − | + | == List items == | |
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The project uses a very fundamental memory model based on binary sequences. The entire memory can be divided into groups of smaller sequences which can themselves each be referred to by a locally unique binary sequence. For example, a 16 megabyte section of RAM can be divided into two million 64-bit sequences. ''List-space'' uses blocks of binary as its local memory resource and divides the block up into smaller binary sequences called ''list items''. Every ''list-item'' holds the same structure of content which is a sequence of three ''list-item-keys''. | The project uses a very fundamental memory model based on binary sequences. The entire memory can be divided into groups of smaller sequences which can themselves each be referred to by a locally unique binary sequence. For example, a 16 megabyte section of RAM can be divided into two million 64-bit sequences. ''List-space'' uses blocks of binary as its local memory resource and divides the block up into smaller binary sequences called ''list items''. Every ''list-item'' holds the same structure of content which is a sequence of three ''list-item-keys''. | ||
| − | + | == List item keys == | |
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Since binary can be treated as numbers, each of the two million sequences in the example above can itself be referred to, or ''addressed'', by a unique binary sequence called a ''list-item-key''. In the case of two million items, the list-item-keys are 21 bit sequences. In other words, a 16MB ''list-space'' is divided into two million ''list-items'' each formed from three 21-bit ''list-item-keys''. | Since binary can be treated as numbers, each of the two million sequences in the example above can itself be referred to, or ''addressed'', by a unique binary sequence called a ''list-item-key''. In the case of two million items, the list-item-keys are 21 bit sequences. In other words, a 16MB ''list-space'' is divided into two million ''list-items'' each formed from three 21-bit ''list-item-keys''. | ||
*The slight inefficiency of wasting one out of every 64 bits is done because of increased efficiency gained from working with sizes which are powers of two. | *The slight inefficiency of wasting one out of every 64 bits is done because of increased efficiency gained from working with sizes which are powers of two. | ||
*Even an "empty" ''list-item'' containing only zero's is still considered to be composed of three ''list-item-keys'' all referring to the very first ''list-item'' in the ''list-space'' (the one that has a sequence of 21 zero's for its address). | *Even an "empty" ''list-item'' containing only zero's is still considered to be composed of three ''list-item-keys'' all referring to the very first ''list-item'' in the ''list-space'' (the one that has a sequence of 21 zero's for its address). | ||
| + | == Three keys == | ||
| + | There are a number of ways that ''list-items'' can be linked together to form lists and ''[[w:Binary Tree|binary-trees]]'' which are all constructed from this general "three-slot" data structure, such as [[List#Stack|stack]]s, [[List#Queue|queue]]s and [[List#Axis|axes]]. ''List-space'' uses a generic [[loop]] linking system for handling what's in use and what's free, but the main functionality of ''list-space'' that is the foundation for [[Nodal Reduction]] is [[binary traversal details|binary traversal]]. | ||
| − | + | Within each of the three keys common to all ''list-items'', the first and second are used for [[binary traversal details|binary traversal]] which allows ''list-item-keys'' to be used as [[association]]s (see [[node references]] for more details on this concept). The last key is context-specific and represents a ''value'' at the end of an ''association'', but both the association-key and the association-value are ''list-item-keys'' -- references to other ''list-items''. | |
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| − | + | == List-space methods == | |
| − | + | ''List-space'' is an environment which offers a generic set of methods that can manipulate a space of ''list-items'', each addressable by a binary ''list-item-key''. Each ''list-item'' is composed of three ''list-item-keys''. This simple model is rich enough to support many kinds of higher data structures such as stacks, queues, threads, loops and trees. | |
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| − | ''List-space'' is an environment which offers a generic set of methods | ||
*listInsert() | *listInsert() | ||
*listRemove(subject) | *listRemove(subject) | ||
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*listGetKeys(subject) | *listGetKeys(subject) | ||
| + | == List space definition == | ||
| + | To allow automated replication of list-space functionality in different environments, nodal organisations are defined to integrate with the program compilation resources. To make use of these nodal organisations, the list-space must be completely defined using the concepts available from within a node-space. | ||
| + | |||
| + | The list-space functions are designed to use only very generic operations. The highest level operations a list-space needs are as follows: | ||
| + | *malloc - the ability to access an area of memory in the form of a sequence of items, which each have a fixed-ordered range of possible states, the most practical being 24- or 32-bit binary words, or in a high-level language, an array of integers. | ||
| + | *reference - each item in the sequence can be referred to by exactly one of the possible states - i.e., a state can be interpreted as an item-reference. | ||
| + | *change - states can be copied from one address to another. | ||
| + | *binary operations - the ability to represent a state as a binary sequence and iterate through it. Interpretation of a state as an address is also based on representing state as binary. In both high- and low-level languages, this can be achieved with the standard binary operations such as AND, OR, XOR, <<, >>. | ||
| − | + | == See also == | |
*[[list-space.c]] ''- current implementation'' | *[[list-space.c]] ''- current implementation'' | ||
| + | [[Category:Nodal Concepts]]__NOTOC__ | ||
Latest revision as of 07:51, 25 May 2016
The Nodes are relatively high-level structures and at runtime within the peer-nodes they sit upon a more fundamental layer called list space in which the actual nodal change takes place in a peer.
List items
The project uses a very fundamental memory model based on binary sequences. The entire memory can be divided into groups of smaller sequences which can themselves each be referred to by a locally unique binary sequence. For example, a 16 megabyte section of RAM can be divided into two million 64-bit sequences. List-space uses blocks of binary as its local memory resource and divides the block up into smaller binary sequences called list items. Every list-item holds the same structure of content which is a sequence of three list-item-keys.
List item keys
Since binary can be treated as numbers, each of the two million sequences in the example above can itself be referred to, or addressed, by a unique binary sequence called a list-item-key. In the case of two million items, the list-item-keys are 21 bit sequences. In other words, a 16MB list-space is divided into two million list-items each formed from three 21-bit list-item-keys.
- The slight inefficiency of wasting one out of every 64 bits is done because of increased efficiency gained from working with sizes which are powers of two.
- Even an "empty" list-item containing only zero's is still considered to be composed of three list-item-keys all referring to the very first list-item in the list-space (the one that has a sequence of 21 zero's for its address).
Three keys
There are a number of ways that list-items can be linked together to form lists and binary-trees which are all constructed from this general "three-slot" data structure, such as stacks, queues and axes. List-space uses a generic loop linking system for handling what's in use and what's free, but the main functionality of list-space that is the foundation for Nodal Reduction is binary traversal.
Within each of the three keys common to all list-items, the first and second are used for binary traversal which allows list-item-keys to be used as associations (see node references for more details on this concept). The last key is context-specific and represents a value at the end of an association, but both the association-key and the association-value are list-item-keys -- references to other list-items.
List-space methods
List-space is an environment which offers a generic set of methods that can manipulate a space of list-items, each addressable by a binary list-item-key. Each list-item is composed of three list-item-keys. This simple model is rich enough to support many kinds of higher data structures such as stacks, queues, threads, loops and trees.
- listInsert()
- listRemove(subject)
- listTraverse(subject, object)
- listGetValue(subject)
- listSetValue(subject, value)
- listGetKeys(subject)
List space definition
To allow automated replication of list-space functionality in different environments, nodal organisations are defined to integrate with the program compilation resources. To make use of these nodal organisations, the list-space must be completely defined using the concepts available from within a node-space.
The list-space functions are designed to use only very generic operations. The highest level operations a list-space needs are as follows:
- malloc - the ability to access an area of memory in the form of a sequence of items, which each have a fixed-ordered range of possible states, the most practical being 24- or 32-bit binary words, or in a high-level language, an array of integers.
- reference - each item in the sequence can be referred to by exactly one of the possible states - i.e., a state can be interpreted as an item-reference.
- change - states can be copied from one address to another.
- binary operations - the ability to represent a state as a binary sequence and iterate through it. Interpretation of a state as an address is also based on representing state as binary. In both high- and low-level languages, this can be achieved with the standard binary operations such as AND, OR, XOR, <<, >>.
See also
- list-space.c - current implementation
