What is a semaphore? #ShawnHymel #electronics #engineering #maker
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What is a semaphore? #ShawnHymel #electronics #engineering #maker
A semaphore is a synchronization primitive similar to a mutex, but it can count beyond just 0 and 1 (what mutexes are limited to). While a mutex acts like a single key to a restroom, a semaphore is like having multiple keys that can unlock multiple bathrooms in a shopping complex. Semaphores are used to control access to critical resources or ...
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Railway Semaphore Signal History
SEMAPHORE SIGNAL SUNDAY at The Spa Country Railway Daylesford, Australia. #train #railway #railroad | Schony747 Youtube & DVD
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Stop!!! The iconic beauty of the semaphore railway signal. Becoming very rare on the main rail network, but still found working on heritage rail lines. Also, no model railway is complete without them!!#uktrainspotting #trains #diesellocomotive #britishrailways #railway #railways #trainspotting #railroad #modelrailway | Adrian Watson
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Stop!!! The iconic beauty of the semaphore railway signal. Becoming very rare on the main rail network, but still found working on heritage rail lines. Also, no model railway is complete without them!!#uktrainspotting #trains #diesellocomotive #britishrailways #railway #railways #trainspotting #railroad #modelrailway | Adrian Watson
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#OnThisDay 1924: The 'pips' (aka the Greenwich Time Signal) began, soon to become an iconic part of radio's soundscape. Find out more about their interesting history here: https://www.bbc.com/historyofthebbc/anniversaries/february/the-pips/ | BBC Archive
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#OnThisDay 1924: The 'pips' (aka the Greenwich Time Signal) began, soon to become an iconic part of radio's soundscape. Find out more about their interesting history here: https://www.bbc.com/historyofthebbc/anniversaries/february/the-pips/ | BBC Archive
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80.3K viewsFeb 2, 2023
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