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package jsr166y; |
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import java.util.concurrent.*; |
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.Collection; |
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import java.util.Collections; |
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import java.util.List; |
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import java.util.concurrent.AbstractExecutorService; |
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import java.util.concurrent.Callable; |
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import java.util.concurrent.CountDownLatch; |
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import java.util.concurrent.ExecutorService; |
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import java.util.concurrent.Future; |
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import java.util.concurrent.RejectedExecutionException; |
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import java.util.concurrent.RunnableFuture; |
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import java.util.concurrent.TimeUnit; |
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import java.util.concurrent.TimeoutException; |
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import java.util.concurrent.atomic.AtomicInteger; |
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import java.util.concurrent.locks.LockSupport; |
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import java.util.concurrent.locks.ReentrantLock; |
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import java.util.concurrent.atomic.AtomicInteger; |
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import java.util.concurrent.CountDownLatch; |
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/** |
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* An {@link ExecutorService} for running {@link ForkJoinTask}s. |
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/** |
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* The wakeup interval (in nanoseconds) for the oldest worker |
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* waiting for an event invokes tryShutdownUnusedWorker to shrink |
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* the number of workers. The exact value does not matter too |
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* much, but should be long enough to slowly release resources |
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* during long periods without use without disrupting normal use. |
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* waiting for an event to invoke tryShutdownUnusedWorker to |
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* shrink the number of workers. The exact value does not matter |
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* too much. It must be short enough to release resources during |
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* sustained periods of idleness, but not so short that threads |
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* are continually re-created. |
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*/ |
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private static final long SHRINK_RATE_NANOS = |
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30L * 1000L * 1000L * 1000L; // 2 per minute |
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* (rarely) necessary when other count updates lag. |
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* |
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* @param dr -- either zero or ONE_RUNNING |
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* @param dt == either zero or ONE_TOTAL |
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* @param dt -- either zero or ONE_TOTAL |
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*/ |
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private void decrementWorkerCounts(int dr, int dt) { |
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for (;;) { |
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/** |
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* Returns the number of worker threads that have started but not |
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* yet terminated. This result returned by this method may differ |
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* yet terminated. The result returned by this method may differ |
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* from {@link #getParallelism} when threads are created to |
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* maintain parallelism when others are cooperatively blocked. |
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* |
