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In the event of a failure, the hot spare would take over, and the main machine would become the new hot spare. In the event of an update, the hot spare would activate, the main system would update, and then the updated system would resume control.The earliest true Dynamic Software Updating system is DYMOS (Dynamic Modification System).The earliest precursor to dynamic software updating is redundant systems.
Likewise, a program that has a plugin architecture, must be able to load and execute new code at runtime.
Similar techniques are sometimes also employed for the purpose of dynamic dead-code elimination to remove conditionally dead or unreachable code at load or runtime, and recombine the remaining code to minimize its memory footprint or improve speed.
While these analyses prove properties of programs that are valuable for DSU, they are by nature sophisticated and difficult to understand.
DSU systems that do not use a static analysis might require use of a specialized compiler.
Kitsune and Ekiden require developers to manually specify and name all update points.
Updating systems differ in the types of program changes that they support.
For example, Ksplice only supports code changes in functions, and does not support changes to state representation.
This is because Ksplice primarily targets security changes, rather than general updates.
In some systems, such as Up Stare and Po LUS, an update can occur at any time during execution.
Ginseng's compiler will attempt to infer good locations for update points, but can also use programmer-specified update points.
Presented in 1983 in the Ph D dissertation of Insup Lee, DYMOS was a fully integrated system that had access to an interactive user interface, a compiler and runtime for a Modula variant, and source code.Tags: Adult Dating, affair dating, sex dating