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GE Software Engineer Interview Question (student candidate)

I interviewed in Virginia Beach, VA and was asked:
"Not difficult but, "What is a semaphore?""
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A Semaphore is a data type that tracks usage of resources for software systems with multiple processes operating at once. The semaphore tells the software when resources are available to run your next process and prevents race conditions.
- SomeGuy on Feb 7, 2013 Flag Response

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