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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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import java.util.concurrent.*; |
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* BinaryAsyncActions are simpler to use and have less overhead in |
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* typical uasges but are restricted to binary computation trees. |
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* |
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* <p> Upon construction, an BinaryAsyncAction does not bear any |
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* <p>Upon construction, an BinaryAsyncAction does not bear any |
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* linkages. For non-root tasks, links must be established using |
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* method <tt>linkSubtasks</tt> before use. |
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* |
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* <p> <b>Sample Usage.</b> A version of Fibonacci: |
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* <p><b>Sample Usage.</b> A version of Fibonacci: |
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* <pre> |
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* class Fib extends BinaryAsyncAction { |
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* final int n; |
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* Overridable callback action triggered upon <tt>complete</tt> of |
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* subtasks. Upon invocation, both subtasks have completed. |
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* After return, this task <tt>isDone</tt> and is joinable by |
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* other tasks. The default version of this method does |
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* nothing. But it may be overridden in subclasses to perform |
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* some action (for example a reduction) when this task is |
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* completes. |
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* other tasks. The default version of this method does nothing. |
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* But it may be overridden in subclasses to perform some action |
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* (for example a reduction) when this task is completes. |
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* @param x one subtask |
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* @param y the other subtask |
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*/ |
