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semaphore noun

  /ˈsɛm.əˌfɔɹ/ , /ˈsɛm.əˌfɔː/
  • (computing) A bit, token, fragment of code, or some other mechanism which is used to restrict access to a shared function or device to a single process at a time, or to synchronize and coordinate events in different processes.
Semaphor
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