To communicate by means of such devices as lights or signs
Etymologically the word implies that the messages are written, but its earliest use was of appliances that depended on visual signals, such as the semaphore or optical telegraph of Claude Chappe.
If you do n't have any proper semaphore flags, then you could make some.
semaphore signal in which the arm was raised to indicate ' off ' or ' clear ' .
semaphore set in an inconsistent state.
Multiple threads must not initialize the same semaphore simultaneously.
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