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So far we discussed a compiled library and an interpreted systems. Both of them benefit from the multithreaded ingredient.
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For interpreted environments the multithreading support can be implemented in two ways:
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Interpreted level only -- threads are implemented as interpretive objects. The context switch between threads does not involve swapping machine registers, but instead the interpreter is switched to interpret different threads.
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Interpreted and compiled level -- each interpreted thread is mapped onto a compiled thread. The compiled thread consists of the interpreter which interprets the interpreted thread.
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The example of the first approach is MOVIE, of the other -- the HotJava browser. Comparing those two, we can notice the following aspects:
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