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<p>are unnecessary when writing fibered code, as they are implicitly synchronized.  However, many libraries yield a fiber implicitly as a method of conducting <a href="page.php?w=non-blocking_I%2FO">non-blocking I/O</a>; as such, some caution and documentation reading is advised. A disadvantage is that fibers cannot utilize <a href="page.php?w=multiprocessor">multiprocessor</a> machines without also using preemptive threads; however, an <a href="page.php?w=Thread_%28computer_science%29">M:N threading model</a> with no more preemptive threads than</p><p>
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