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Often, one thread is producing some data, while another thread wants to use it.
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A flag variable is introduce that both threads can check.
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If the data is not ready (flag is false), the consuming thread can call the method wait ( ), which causes it to be suspended until some other event occurs.
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When the producing thread has some data, it can set the flag to be true and call the method notify ( ), which causes an event that will "wake up" one of the suspended threads.
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If the user doesn't get the logic right, there are possibilities for deadlock or other forms of non-progress.
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