109   //
 110   // The idea is that objects representing fine-grained tasks, such as
 111   // threads, will contain a "parity" field.  A task will is claimed in the
 112   // current "process_roots" call only if its parity field is the
 113   // same as the "strong_roots_parity"; task claiming is accomplished by
 114   // updating the parity field to the strong_roots_parity with a CAS.
 115   //
 116   // If the client meats this spec, then strong_roots_parity() will have
 117   // the following properties:
 118   //   a) to return a different value than was returned before the last
 119   //      call to change_strong_roots_parity, and
 120   //   c) to never return a distinguished value (zero) with which such
 121   //      task-claiming variables may be initialized, to indicate "never
 122   //      claimed".
 123  public:
 124 
 125   // Call these in sequential code around process_roots.
 126   // strong_roots_prologue calls change_strong_roots_parity, if
 127   // parallel tasks are enabled.
 128   class StrongRootsScope : public MarkingCodeBlobClosure::MarkScope {
 129     SharedHeap*   _sh;
 130 
 131    public:
 132     StrongRootsScope(SharedHeap* heap, bool activate = true);
 133     ~StrongRootsScope();
 134   };
 135  };
 136 
 137 #endif // SHARE_VM_MEMORY_SHAREDHEAP_HPP

 109   //
 110   // The idea is that objects representing fine-grained tasks, such as
 111   // threads, will contain a "parity" field.  A task will is claimed in the
 112   // current "process_roots" call only if its parity field is the
 113   // same as the "strong_roots_parity"; task claiming is accomplished by
 114   // updating the parity field to the strong_roots_parity with a CAS.
 115   //
 116   // If the client meats this spec, then strong_roots_parity() will have
 117   // the following properties:
 118   //   a) to return a different value than was returned before the last
 119   //      call to change_strong_roots_parity, and
 120   //   c) to never return a distinguished value (zero) with which such
 121   //      task-claiming variables may be initialized, to indicate "never
 122   //      claimed".
 123  public:
 124 
 125   // Call these in sequential code around process_roots.
 126   // strong_roots_prologue calls change_strong_roots_parity, if
 127   // parallel tasks are enabled.
 128   class StrongRootsScope : public MarkingCodeBlobClosure::MarkScope {


 129    public:
 130     StrongRootsScope(bool activate = true);
 131     ~StrongRootsScope();
 132   };
 133  };
 134 
 135 #endif // SHARE_VM_MEMORY_SHAREDHEAP_HPP