What are the dangers of using global variables?
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Answer:
When using that variable in multithread context. All operations on that variable must be guarded by a locking mechanism (which are not very nice and time friendly) or atomic operations. And if you use this variable as a state holder, you are f..... I'm not saying don't use global variables, because it is imposible not to use them, but limit them.
Stelian Nicolae at Quora Visit the source
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