/**@class java.util.concurrent.ForkJoinPool
@extends java.util.concurrent.AbstractExecutorService

 An {@link java.util.concurrent.ExecutorService} for running {@link java.util.concurrent.ForkJoinTask}s.
 A {@code ForkJoinPool} provides the entry point for submissions
 from non-{@code ForkJoinTask} clients, as well as management and
 monitoring operations.

 <p>A {@code ForkJoinPool} differs from other kinds of {@link java.util.concurrent.ExecutorService} mainly by virtue of employing
 <em>work-stealing</em>: all threads in the pool attempt to find and
 execute tasks submitted to the pool and/or created by other active
 tasks (eventually blocking waiting for work if none exist). This
 enables efficient processing when most tasks spawn other subtasks
 (as do most {@code ForkJoinTask}s), as well as when many small
 tasks are submitted to the pool from external clients.  Especially
 when setting <em>asyncMode</em> to true in constructors, {@code
 ForkJoinPool}s may also be appropriate for use with event-style
 tasks that are never joined.

 <p>A static {@link #commonPool}() is available and appropriate for
 most applications. The common pool is used by any ForkJoinTask that
 is not explicitly submitted to a specified pool. Using the common
 pool normally reduces resource usage (its threads are slowly
 reclaimed during periods of non-use, and reinstated upon subsequent
 use).

 <p>For applications that require separate or custom pools, a {@code
 ForkJoinPool} may be constructed with a given target parallelism
 level; by default, equal to the number of available processors.
 The pool attempts to maintain enough active (or available) threads
 by dynamically adding, suspending, or resuming internal worker
 threads, even if some tasks are stalled waiting to join others.
 However, no such adjustments are guaranteed in the face of blocked
 I/O or other unmanaged synchronization. The nested {@link java.util.concurrent.ForkJoinPool.ManagedBlocker} interface enables extension of the kinds of
 synchronization accommodated.

 <p>In addition to execution and lifecycle control methods, this
 class provides status check methods (for example
 {@link #getStealCount}) that are intended to aid in developing,
 tuning, and monitoring fork/join applications. Also, method
 {@link #toString} returns indications of pool state in a
 convenient form for informal monitoring.

 <p>As is the case with other ExecutorServices, there are three
 main task execution methods summarized in the following table.
 These are designed to be used primarily by clients not already
 engaged in fork/join computations in the current pool.  The main
 forms of these methods accept instances of {@code ForkJoinTask},
 but overloaded forms also allow mixed execution of plain {@code
 Runnable}- or {@code Callable}- based activities as well.  However,
 tasks that are already executing in a pool should normally instead
 use the within-computation forms listed in the table unless using
 async event-style tasks that are not usually joined, in which case
 there is little difference among choice of methods.

 <table BORDER CELLPADDING=3 CELLSPACING=1>
 <caption>Summary of task execution methods</caption>
  <tr>
    <td></td>
    <td ALIGN=CENTER> <b>Call from non-fork/join clients</b></td>
    <td ALIGN=CENTER> <b>Call from within fork/join computations</b></td>
  </tr>
  <tr>
    <td> <b>Arrange async execution</b></td>
    <td> {@link #execute}(ForkJoinTask)</td>
    <td> {@link java.util.concurrent.ForkJoinTask#fork}</td>
  </tr>
  <tr>
    <td> <b>Await and obtain result</b></td>
    <td> {@link #invoke}(ForkJoinTask)</td>
    <td> {@link java.util.concurrent.ForkJoinTask#invoke}</td>
  </tr>
  <tr>
    <td> <b>Arrange exec and obtain Future</b></td>
    <td> {@link #submit}(ForkJoinTask)</td>
    <td> {@link java.util.concurrent.ForkJoinTask#fork} (ForkJoinTasks <em>are</em> Futures)</td>
  </tr>
 </table>

 <p>The common pool is by default constructed with default
 parameters, but these may be controlled by setting three
 {@linkplain System#getProperty system properties}:
 <ul>
 <li>{@code java.util.concurrent.ForkJoinPool.common.parallelism}
 - the parallelism level, a non-negative integer
 <li>{@code java.util.concurrent.ForkJoinPool.common.threadFactory}
 - the class name of a {@link java.util.concurrent.ForkJoinPool.ForkJoinWorkerThreadFactory}
 <li>{@code java.util.concurrent.ForkJoinPool.common.exceptionHandler}
 - the class name of a {@link UncaughtExceptionHandler}
 <li>{@code java.util.concurrent.ForkJoinPool.common.maximumSpares}
 - the maximum number of allowed extra threads to maintain target
 parallelism (default 256).
 </ul>
 If a {@link SecurityManager} is present and no factory is
 specified, then the default pool uses a factory supplying
 threads that have no {@link Permissions} enabled.
 The system class loader is used to load these classes.
 Upon any error in establishing these settings, default parameters
 are used. It is possible to disable or limit the use of threads in
 the common pool by setting the parallelism property to zero, and/or
 using a factory that may return {@code null}. However doing so may
 cause unjoined tasks to never be executed.

 <p><b>Implementation notes</b>: This implementation restricts the
 maximum number of running threads to 32767. Attempts to create
 pools with greater than the maximum number result in
 {@code IllegalArgumentException}.

 <p>This implementation rejects submitted tasks (that is, by throwing
 {@link java.util.concurrent.RejectedExecutionException}) only when the pool is shut down
 or internal resources have been exhausted.

 @since 1.7
 @author Doug Lea
*/
var ForkJoinPool = {

/** Creates a new ForkJoinWorkerThread. This factory is used unless
 overridden in ForkJoinPool constructors.
*/
defaultForkJoinWorkerThreadFactory : "null",
/**Returns the common pool instance. This pool is statically
 constructed; its run state is unaffected by attempts to {@link #shutdown} or {@link #shutdownNow}. However this pool and any
 ongoing processing are automatically terminated upon program
 {@link System#exit}.  Any program that relies on asynchronous
 task processing to complete before program termination should
 invoke {@code commonPool().}{@link #awaitQuiescence awaitQuiescence},
 before exit.
@return {Object {java.util.concurrent.ForkJoinPool}} the common pool instance
@since 1.8
*/
commonPool : function(  ) {},

/**Performs the given task, returning its result upon completion.
 If the computation encounters an unchecked Exception or Error,
 it is rethrown as the outcome of this invocation.  Rethrown
 exceptions behave in the same way as regular exceptions, but,
 when possible, contain stack traces (as displayed for example
 using {@code ex.printStackTrace()}) of both the current thread
 as well as the thread actually encountering the exception;
 minimally only the latter.
@param {Object {java.util.concurrent.ForkJoinTask}} task the task
@param <T> the type of the task's result
@return {Object {java.lang.Object}} the task's result
@throws NullPointerException if the task is null
@throws RejectedExecutionException if the task cannot be
         scheduled for execution
*/
invoke : function(  ) {},

/**Arranges for (asynchronous) execution of the given task.
@param {Object {java.util.concurrent.ForkJoinTask}} task the task
@throws NullPointerException if the task is null
@throws RejectedExecutionException if the task cannot be
         scheduled for execution
*/
execute : function(  ) {},

/**
@throws NullPointerException if the task is null
@throws RejectedExecutionException if the task cannot be
         scheduled for execution
*/
execute : function(  ) {},

/**Submits a ForkJoinTask for execution.
@param {Object {java.util.concurrent.ForkJoinTask}} task the task to submit
@param <T> the type of the task's result
@return {Object {java.util.concurrent.ForkJoinTask}} the task
@throws NullPointerException if the task is null
@throws RejectedExecutionException if the task cannot be
         scheduled for execution
*/
submit : function(  ) {},

/**
@throws NullPointerException if the task is null
@throws RejectedExecutionException if the task cannot be
         scheduled for execution
*/
submit : function(  ) {},

/**
@throws NullPointerException if the task is null
@throws RejectedExecutionException if the task cannot be
         scheduled for execution
*/
submit : function(  ) {},

/**
@throws NullPointerException if the task is null
@throws RejectedExecutionException if the task cannot be
         scheduled for execution
*/
submit : function(  ) {},

/**
@throws NullPointerException       {@inheritDoc}
@throws RejectedExecutionException {@inheritDoc}
*/
invokeAll : function(  ) {},

/**Returns the factory used for constructing new workers.
@return {Object {java.util.concurrent.ForkJoinPool.ForkJoinWorkerThreadFactory}} the factory used for constructing new workers
*/
getFactory : function(  ) {},

/**Returns the handler for internal worker threads that terminate
 due to unrecoverable errors encountered while executing tasks.
@return {Object {java.lang.Thread.UncaughtExceptionHandler}} the handler, or {@code null} if none
*/
getUncaughtExceptionHandler : function(  ) {},

/**Returns the targeted parallelism level of this pool.
@return {Number} the targeted parallelism level of this pool
*/
getParallelism : function(  ) {},

/**Returns the targeted parallelism level of the common pool.
@return {Number} the targeted parallelism level of the common pool
@since 1.8
*/
getCommonPoolParallelism : function(  ) {},

/**Returns the number of worker threads that have started but not
 yet terminated.  The result returned by this method may differ
 from {@link #getParallelism} when threads are created to
 maintain parallelism when others are cooperatively blocked.
@return {Number} the number of worker threads
*/
getPoolSize : function(  ) {},

/**Returns {@code true} if this pool uses local first-in-first-out
 scheduling mode for forked tasks that are never joined.
@return {Boolean} {@code true} if this pool uses async mode
*/
getAsyncMode : function(  ) {},

/**Returns an estimate of the number of worker threads that are
 not blocked waiting to join tasks or for other managed
 synchronization. This method may overestimate the
 number of running threads.
@return {Number} the number of worker threads
*/
getRunningThreadCount : function(  ) {},

/**Returns an estimate of the number of threads that are currently
 stealing or executing tasks. This method may overestimate the
 number of active threads.
@return {Number} the number of active threads
*/
getActiveThreadCount : function(  ) {},

/**Returns {@code true} if all worker threads are currently idle.
 An idle worker is one that cannot obtain a task to execute
 because none are available to steal from other threads, and
 there are no pending submissions to the pool. This method is
 conservative; it might not return {@code true} immediately upon
 idleness of all threads, but will eventually become true if
 threads remain inactive.
@return {Boolean} {@code true} if all threads are currently idle
*/
isQuiescent : function(  ) {},

/**Returns an estimate of the total number of tasks stolen from
 one thread's work queue by another. The reported value
 underestimates the actual total number of steals when the pool
 is not quiescent. This value may be useful for monitoring and
 tuning fork/join programs: in general, steal counts should be
 high enough to keep threads busy, but low enough to avoid
 overhead and contention across threads.
@return {Number} the number of steals
*/
getStealCount : function(  ) {},

/**Returns an estimate of the total number of tasks currently held
 in queues by worker threads (but not including tasks submitted
 to the pool that have not begun executing). This value is only
 an approximation, obtained by iterating across all threads in
 the pool. This method may be useful for tuning task
 granularities.
@return {Number} the number of queued tasks
*/
getQueuedTaskCount : function(  ) {},

/**Returns an estimate of the number of tasks submitted to this
 pool that have not yet begun executing.  This method may take
 time proportional to the number of submissions.
@return {Number} the number of queued submissions
*/
getQueuedSubmissionCount : function(  ) {},

/**Returns {@code true} if there are any tasks submitted to this
 pool that have not yet begun executing.
@return {Boolean} {@code true} if there are any queued submissions
*/
hasQueuedSubmissions : function(  ) {},

/**Returns a string identifying this pool, as well as its state,
 including indications of run state, parallelism level, and
 worker and task counts.
@return {String} a string identifying this pool, as well as its state
*/
toString : function(  ) {},

/**Possibly initiates an orderly shutdown in which previously
 submitted tasks are executed, but no new tasks will be
 accepted. Invocation has no effect on execution state if this
 is the {@link #commonPool}(), and no additional effect if
 already shut down.  Tasks that are in the process of being
 submitted concurrently during the course of this method may or
 may not be rejected.
@throws SecurityException if a security manager exists and
         the caller is not permitted to modify threads
         because it does not hold {@link
         java.lang.RuntimePermission}{@code ("modifyThread")}
*/
shutdown : function(  ) {},

/**Possibly attempts to cancel and/or stop all tasks, and reject
 all subsequently submitted tasks.  Invocation has no effect on
 execution state if this is the {@link #commonPool}(), and no
 additional effect if already shut down. Otherwise, tasks that
 are in the process of being submitted or executed concurrently
 during the course of this method may or may not be
 rejected. This method cancels both existing and unexecuted
 tasks, in order to permit termination in the presence of task
 dependencies. So the method always returns an empty list
 (unlike the case for some other Executors).
@return {Object {java.util.List}} an empty list
@throws SecurityException if a security manager exists and
         the caller is not permitted to modify threads
         because it does not hold {@link
         java.lang.RuntimePermission}{@code ("modifyThread")}
*/
shutdownNow : function(  ) {},

/**Returns {@code true} if all tasks have completed following shut down.
@return {Boolean} {@code true} if all tasks have completed following shut down
*/
isTerminated : function(  ) {},

/**Returns {@code true} if the process of termination has
 commenced but not yet completed.  This method may be useful for
 debugging. A return of {@code true} reported a sufficient
 period after shutdown may indicate that submitted tasks have
 ignored or suppressed interruption, or are waiting for I/O,
 causing this executor not to properly terminate. (See the
 advisory notes for class {@link java.util.concurrent.ForkJoinTask} stating that
 tasks should not normally entail blocking operations.  But if
 they do, they must abort them on interrupt.)
@return {Boolean} {@code true} if terminating but not yet terminated
*/
isTerminating : function(  ) {},

/**Returns {@code true} if this pool has been shut down.
@return {Boolean} {@code true} if this pool has been shut down
*/
isShutdown : function(  ) {},

/**Blocks until all tasks have completed execution after a
 shutdown request, or the timeout occurs, or the current thread
 is interrupted, whichever happens first. Because the {@link #commonPool}() never terminates until program shutdown, when
 applied to the common pool, this method is equivalent to {@link #awaitQuiescence(long, java.util.concurrent.TimeUnit)} but always returns {@code false}.
@param {Number} timeout the maximum time to wait
@param {Object {TimeUnit}} unit the time unit of the timeout argument
@return {Boolean} {@code true} if this executor terminated and
         {@code false} if the timeout elapsed before termination
@throws InterruptedException if interrupted while waiting
*/
awaitTermination : function(  ) {},

/**If called by a ForkJoinTask operating in this pool, equivalent
 in effect to {@link java.util.concurrent.ForkJoinTask#helpQuiesce}. Otherwise,
 waits and/or attempts to assist performing tasks until this
 pool {@link #isQuiescent} or the indicated timeout elapses.
@param {Number} timeout the maximum time to wait
@param {Object {TimeUnit}} unit the time unit of the timeout argument
@return {Boolean} {@code true} if quiescent; {@code false} if the
 timeout elapsed.
*/
awaitQuiescence : function(  ) {},

/**Runs the given possibly blocking task.  When {@linkplain
 java.util.concurrent.ForkJoinTask#inForkJoinPool() running in a ForkJoinPool}, this
 method possibly arranges for a spare thread to be activated if
 necessary to ensure sufficient parallelism while the current
 thread is blocked in {@link java.util.concurrent.ForkJoinPool.ManagedBlocker#block blocker.block()}.

 <p>This method repeatedly calls {@code blocker.isReleasable()} and
 {@code blocker.block()} until either method returns {@code true}.
 Every call to {@code blocker.block()} is preceded by a call to
 {@code blocker.isReleasable()} that returned {@code false}.

 <p>If not running in a ForkJoinPool, this method is
 behaviorally equivalent to
 <pre> {@code
 while (!blocker.isReleasable())
   if (blocker.block())
     break;}</pre>

 If running in a ForkJoinPool, the pool may first be expanded to
 ensure sufficient parallelism available during the call to
 {@code blocker.block()}.
@param {Object {ForkJoinPool.ManagedBlocker}} blocker the blocker task
@throws InterruptedException if {@code blocker.block()} did so
*/
managedBlock : function(  ) {},


};