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 /*

  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

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 // Tasks for parallel compaction of the old generation

 //

 // Tasks are created and enqueued on a task queue. The

 // tasks for parallel old collector for marking objects

 // are MarkFromRootsTask and ThreadRootsMarkingTask.

 //

 // MarkFromRootsTask's are created

 // with a root group (e.g., jni_handles) and when the do_it()

 // method of a MarkFromRootsTask is executed, it starts marking

 // form it's root group.

 //

 // ThreadRootsMarkingTask's are created for each Java thread.  When

 // the do_it() method of a ThreadRootsMarkingTask is executed, it

 // starts marking from the thread's roots.

 //

 // The enqueuing of the MarkFromRootsTask and ThreadRootsMarkingTask

 // do little more than create the task and put it on a queue.  The

 // queue is a GCTaskQueue and threads steal tasks from this GCTaskQueue.

 //

 // In addition to the MarkFromRootsTask and ThreadRootsMarkingTask

 // tasks there are StealMarkingTask tasks.  The StealMarkingTask's

 // steal a reference from the marking stack of another

 // thread and transitively marks the object of the reference

 // and internal references.  After successfully stealing a reference

 // and marking it, the StealMarkingTask drains its marking stack

 // stack before attempting another steal.

 //

 // ThreadRootsMarkingTask

 //

 // This task marks from the roots of a single thread. This task

 // enables marking of thread roots in parallel.

 //

 class ParallelTaskTerminator;

 class ThreadRootsMarkingTask : public GCTask {

  private:

   JavaThread* _java_thread;

   VMThread* _vm_thread;

  public:

   ThreadRootsMarkingTask(JavaThread* root) : _java_thread(root), _vm_thread(NULL) {}

   ThreadRootsMarkingTask(VMThread* root) : _java_thread(NULL), _vm_thread(root) {}

   char* name() { return (char *)"thread-roots-marking-task"; }

   virtual void do_it(GCTaskManager* manager, uint which);

 };

 //

 // MarkFromRootsTask

 //

 // This task marks from all the roots to all live

 // objects.

 //

 //

 class MarkFromRootsTask : public GCTask {

  public:

   enum RootType {

     universe              = 1,

     jni_handles           = 2,

     threads               = 3,

     object_synchronizer   = 4,

     flat_profiler         = 5,

     management            = 6,

     jvmti                 = 7,

     system_dictionary     = 8,

     vm_symbols            = 9,

     reference_processing  = 10,

     code_cache            = 11

   };

  private:

   RootType _root_type;

  public:

   MarkFromRootsTask(RootType value) : _root_type(value) {}

   char* name() { return (char *)"mark-from-roots-task"; }

   virtual void do_it(GCTaskManager* manager, uint which);

 };

 //

 // RefProcTaskProxy

 //

 // This task is used as a proxy to parallel reference processing tasks .

 //

 class RefProcTaskProxy : public GCTask {

   typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask;

   ProcessTask & _rp_task;

   uint          _work_id;

 public:

   RefProcTaskProxy(ProcessTask & rp_task, uint work_id)

     : _rp_task(rp_task),

       _work_id(work_id)

   { }

 private:

   virtual char* name() { return (char *)"Process referents by policy in parallel"; }

   virtual void do_it(GCTaskManager* manager, uint which);

 };

 //

 // RefEnqueueTaskProxy

 //

 // This task is used as a proxy to parallel reference processing tasks .

 //

 class RefEnqueueTaskProxy: public GCTask {

   typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask;

   EnqueueTask& _enq_task;

   uint         _work_id;

 public:

   RefEnqueueTaskProxy(EnqueueTask& enq_task, uint work_id)

     : _enq_task(enq_task),

       _work_id(work_id)

   { }

   virtual char* name() { return (char *)"Enqueue reference objects in parallel"; }

   virtual void do_it(GCTaskManager* manager, uint which)

   {

     _enq_task.work(_work_id);

   }

 };

 //

 // RefProcTaskExecutor

 //

 // Task executor is an interface for the reference processor to run

 // tasks using GCTaskManager.

 //

 class RefProcTaskExecutor: public AbstractRefProcTaskExecutor {

   virtual void execute(ProcessTask& task);

   virtual void execute(EnqueueTask& task);

 };

 //

 // StealMarkingTask

 //

 // This task is used to distribute work to idle threads.

 //

 class StealMarkingTask : public GCTask {

  private:

    ParallelTaskTerminator* const _terminator;

  private:

  public:

   char* name() { return (char *)"steal-marking-task"; }

   StealMarkingTask(ParallelTaskTerminator* t);

   ParallelTaskTerminator* terminator() { return _terminator; }

   virtual void do_it(GCTaskManager* manager, uint which);

 };

 //

 // StealRegionCompactionTask

 //

 // This task is used to distribute work to idle threads.

 //

 class StealRegionCompactionTask : public GCTask {

  private:

    ParallelTaskTerminator* const _terminator;

  public:

   StealRegionCompactionTask(ParallelTaskTerminator* t);

   char* name() { return (char *)"steal-region-task"; }

   ParallelTaskTerminator* terminator() { return _terminator; }

   virtual void do_it(GCTaskManager* manager, uint which);

 };

 //

 // UpdateDensePrefixTask

 //

 // This task is used to update the dense prefix

 // of a space.

 //

 class UpdateDensePrefixTask : public GCTask {

  private:

   PSParallelCompact::SpaceId _space_id;

   size_t _region_index_start;

   size_t _region_index_end;

  public:

   char* name() { return (char *)"update-dense_prefix-task"; }

   UpdateDensePrefixTask(PSParallelCompact::SpaceId space_id,

                         size_t region_index_start,

                         size_t region_index_end);

   virtual void do_it(GCTaskManager* manager, uint which);

 };

 //

 // DrainStacksCompactionTask

 //

 // This task processes regions that have been added to the stacks of each

 // compaction manager.

 //

 // Trying to use one draining thread does not work because there are no

 // guarantees about which task will be picked up by which thread.  For example,

 // if thread A gets all the preloaded regions, thread A may not get a draining

 // task (they may all be done by other threads).

 //

 class DrainStacksCompactionTask : public GCTask {

  uint _stack_index;

  uint stack_index() { return _stack_index; }

  public:

   DrainStacksCompactionTask(uint stack_index) : GCTask(),

                                                 _stack_index(stack_index) {};

   char* name() { return (char *)"drain-region-task"; }

   virtual void do_it(GCTaskManager* manager, uint which);

 };