1 /*
   2  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSTASKS_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSTASKS_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "utilities/growableArray.hpp"
  30 
  31 //
  32 // psTasks.hpp is a collection of GCTasks used by the
  33 // parallelScavenge collector.
  34 //
  35 
  36 class GCTask;
  37 class OopClosure;
  38 class OopStack;
  39 class ObjectStartArray;
  40 class ParallelTaskTerminator;
  41 class MutableSpace;
  42 class PSOldGen;
  43 class Thread;
  44 class VMThread;
  45 
  46 //
  47 // ScavengeRootsTask
  48 //
  49 // This task scans all the roots of a given type.
  50 //
  51 //
  52 
  53 class ScavengeRootsTask : public GCTask {
  54  public:
  55   enum RootType {
  56     universe              = 1,
  57     jni_handles           = 2,
  58     threads               = 3,
  59     object_synchronizer   = 4,
  60     flat_profiler         = 5,
  61     system_dictionary     = 6,
  62     management            = 7,
  63     jvmti                 = 8,
  64     code_cache            = 9
  65   };
  66  private:
  67   RootType _root_type;
  68  public:
  69   ScavengeRootsTask(RootType value) : _root_type(value) {}
  70 
  71   char* name() { return (char *)"scavenge-roots-task"; }
  72 
  73   virtual void do_it(GCTaskManager* manager, uint which);
  74 };
  75 
  76 //
  77 // ThreadRootsTask
  78 //
  79 // This task scans the roots of a single thread. This task
  80 // enables scanning of thread roots in parallel.
  81 //
  82 
  83 class ThreadRootsTask : public GCTask {
  84  private:
  85   JavaThread* _java_thread;
  86   VMThread* _vm_thread;
  87  public:
  88   ThreadRootsTask(JavaThread* root) : _java_thread(root), _vm_thread(NULL) {}
  89   ThreadRootsTask(VMThread* root) : _java_thread(NULL), _vm_thread(root) {}
  90 
  91   char* name() { return (char *)"thread-roots-task"; }
  92 
  93   virtual void do_it(GCTaskManager* manager, uint which);
  94 };
  95 
  96 //
  97 // StealTask
  98 //
  99 // This task is used to distribute work to idle threads.
 100 //
 101 
 102 class StealTask : public GCTask {
 103  private:
 104    ParallelTaskTerminator* const _terminator;
 105  public:
 106   char* name() { return (char *)"steal-task"; }
 107 
 108   StealTask(ParallelTaskTerminator* t);
 109 
 110   ParallelTaskTerminator* terminator() { return _terminator; }
 111 
 112   virtual void do_it(GCTaskManager* manager, uint which);
 113 };
 114 
 115 //
 116 // SerialOldToYoungRootsTask
 117 //
 118 // This task is used to scan for roots in the perm gen
 119 
 120 class SerialOldToYoungRootsTask : public GCTask {
 121  private:
 122   PSOldGen* _gen;
 123   HeapWord* _gen_top;
 124 
 125  public:
 126   SerialOldToYoungRootsTask(PSOldGen *gen, HeapWord* gen_top) :
 127     _gen(gen), _gen_top(gen_top) { }
 128 
 129   char* name() { return (char *)"serial-old-to-young-roots-task"; }
 130 
 131   virtual void do_it(GCTaskManager* manager, uint which);
 132 };
 133 
 134 //
 135 // OldToYoungRootsTask
 136 //
 137 // This task is used to scan old to young roots in parallel
 138 
 139 class OldToYoungRootsTask : public GCTask {
 140  private:
 141   PSOldGen* _gen;
 142   HeapWord* _gen_top;
 143   uint _stripe_number;
 144 
 145  public:
 146   OldToYoungRootsTask(PSOldGen *gen, HeapWord* gen_top, uint stripe_number) :
 147     _gen(gen), _gen_top(gen_top), _stripe_number(stripe_number) { }
 148 
 149   char* name() { return (char *)"old-to-young-roots-task"; }
 150 
 151   virtual void do_it(GCTaskManager* manager, uint which);
 152 };
 153 
 154 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSTASKS_HPP