/*

 * Copyright (c) 2002, 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

 * questions.

 *

 */

#ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSTASKS_HPP

#define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSTASKS_HPP

#include "memory/allocation.hpp"

#include "utilities/growableArray.hpp"

//

// psTasks.hpp is a collection of GCTasks used by the

// parallelScavenge collector.

//

class GCTask;

class OopClosure;

class OopStack;

class ObjectStartArray;

class ParallelTaskTerminator;

class MutableSpace;

class PSOldGen;

class Thread;

class VMThread;

//

// ScavengeRootsTask

//

// This task scans all the roots of a given type.

//

//

class ScavengeRootsTask : public GCTask {

 public:

  enum RootType {

    universe              = 1,

    jni_handles           = 2,

    threads               = 3,

    object_synchronizer   = 4,

    flat_profiler         = 5,

    system_dictionary     = 6,

    management            = 7,

    jvmti                 = 8,

    code_cache            = 9

  };

 private:

  RootType _root_type;

 public:

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

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

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

};

//

// ThreadRootsTask

//

// This task scans the roots of a single thread. This task

// enables scanning of thread roots in parallel.

//

class ThreadRootsTask : public GCTask {

 private:

  JavaThread* _java_thread;

  VMThread* _vm_thread;

 public:

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

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

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

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

};

//

// StealTask

//

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

//

class StealTask : public GCTask {

 private:

   ParallelTaskTerminator* const _terminator;

 public:

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

  StealTask(ParallelTaskTerminator* t);

  ParallelTaskTerminator* terminator() { return _terminator; }

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

};

//

// SerialOldToYoungRootsTask

//

// This task is used to scan for roots in the perm gen

class SerialOldToYoungRootsTask : public GCTask {

 private:

  PSOldGen* _gen;

  HeapWord* _gen_top;

 public:

  SerialOldToYoungRootsTask(PSOldGen *gen, HeapWord* gen_top) :

    _gen(gen), _gen_top(gen_top) { }

  char* name() { return (char *)"serial-old-to-young-roots-task"; }

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

};

//

// OldToYoungRootsTask

//

// This task is used to scan old to young roots in parallel

class OldToYoungRootsTask : public GCTask {

 private:

  PSOldGen* _gen;

  HeapWord* _gen_top;

  uint _stripe_number;

 public:

  OldToYoungRootsTask(PSOldGen *gen, HeapWord* gen_top, uint stripe_number) :

    _gen(gen), _gen_top(gen_top), _stripe_number(stripe_number) { }

  char* name() { return (char *)"old-to-young-roots-task"; }

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

};

#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSTASKS_HPP