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Threads are implemented by a scheduler in Java, which asks the local operating system to run threads in the "runnable" state.
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Typically, the OS runs each thread in turn for a "time slice". However, some operating systems (early versions of Solaris, e.g.) run a thread to completion unless another thread of higher priority preempts the running thread.
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Example of two threads running on one cpu: Each thread gives up execution voluntarily (by executing yield(), suspend(), etc.) or because its time slice has ended:
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Thread A
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Thread B
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