(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.
Other Word Forms of Semaphore
Origin of Semaphore
Borrowed in 1816 from French sémaphore, coined in French from Ancient Greek σῆμα (sêma, “sign”), and -φωρος (-phoros, “bearing, bearer”), from φέρω (férō, “to bear, carry”).
Greek sēma sign –phore
From American Heritage Dictionary of the English Language, 5th Edition
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