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About: Locks-and-keys     Goto   Sponge   NotDistinct   Permalink

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Type: Thinglanguagesoftwareschema:LanguageLanguageProgramming languageyago:WikicatSoftwareBugsyago:Animal100015388yago:Arthropod101767661yago:Bug102236355yago:Insect102159955yago:Invertebrate101905661yago:LivingThing100004258yago:Object100002684yago:Organism100004475yago:PhysicalEntity100001930programming languageyago:Whole100003553 New Facet based on Instances of this Class

Locks-and-keys is a solution to dangling pointers in computer programming languages. The locks-and-keys approach represents pointers as ordered pairs (key, address) where the key is an integer value. Heap-dynamic variables are represented as the storage for the variable plus a cell for an integer lock value. When a variable is allocated, a lock value is created and placed both into the variable's cell and into the pointer's key cell. Every access to the pointer compares these two values, and access is allowed only if the values match.