The Emergence Machine

Semaphore

abstract · Computing · Level 11 · E10

E10Institutions

Each concept here is mapped to its prerequisites — the ideas you'd need first to understand it — all the way down to four foundations: Space, Time, Energy, Pattern. Click any prerequisite to drill down, or scroll for the chain graph.

Trace. Question. Emerge.

Emergence definition

A semaphore is a variable that controls access to a shared resource by maintaining a counter, allowing multiple threads to access it up to a specified limit, which is a critical dependency on synchronization mechanisms.

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Wiktionary senses

External reference — all senses of the word “semaphore” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.

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Source: Wiktionary — “semaphore”. Content available under CC BY-SA 4.0.

Historical origin

Origin word
semaphore
Origin language
English

Prerequisite chain

Possible path of this concept down to the fundamental substrate.

thisfoundationsL11L10L9L8L7L5L2L1L0SemaphoreResourceEconomySocietyCommunityConcurrencyBehaviorClothGoalVariable… intermediate l…DurationForceFormInformationActionChangeCollectionMatterEnergyPatternSpaceTimeE1 concrete → E14 abstract

Neighborhood

Direct prerequisites above, concepts that depend on this one below.

thisprerequisitesSemaphoreL11VariableL5ConcurrencyL7ResourceL10E1 concrete → E14 abstract

In other languages

Prerequisites

What you need to understand first.

  • Variable L5 (requires)
    A semaphore is a variable that controls access to a shared resource by maintaining a counter, allowing multiple threads to access it up to a specified limit.
  • Concurrency L7 (requires)
    A semaphore is a synchronization primitive that maintains a counter to control access to shared resources, allowing multiple threads up to a limit.
  • Resource L10 (requires)
    A semaphore is a variable that controls access to a shared resource by maintaining a counter, allowing multiple threads to access it up to a specified limit.