21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_CONCURRENTGCPHASEMANAGER_HPP
  26 #define SHARE_VM_GC_CONCURRENTGCPHASEMANAGER_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 
  30 // Manage concurrent phase information, to support WhiteBox testing.
  31 // Managers are stack allocated.  Managers may be nested, to support
  32 // nested subphases.
  33 class ConcurrentGCPhaseManager : public StackObj {
  34 public:
  35 
  36   // Special phase ids used by all GC's that use this facility.
  37   static const int UNCONSTRAINED_PHASE = 0; // Unconstrained or no request.
  38   static const int IDLE_PHASE = 1;          // Concurrent processing is idle.
  39 
  40   // Stack of phase managers.
  41   class Stack VALUE_OBJ_CLASS_SPEC {
  42     friend class ConcurrentGCPhaseManager;
  43 
  44   public:
  45     // Create an empty stack of phase managers.
  46     Stack();
  47 
  48   private:
  49     int _requested_phase;
  50     ConcurrentGCPhaseManager* _top;
  51 
  52     // Non-copyable - never defined.
  53     Stack(const Stack&);
  54     Stack& operator=(const Stack&);
  55   };
  56 
  57   // Construct and push a new manager on the stack, activating phase.
  58   // Notifies callers in wait_for_phase of the phase change.
  59   //
  60   // Preconditions:
  61   // - Calling thread must be a ConcurrentGC thread

  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_CONCURRENTGCPHASEMANAGER_HPP
  26 #define SHARE_VM_GC_CONCURRENTGCPHASEMANAGER_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 
  30 // Manage concurrent phase information, to support WhiteBox testing.
  31 // Managers are stack allocated.  Managers may be nested, to support
  32 // nested subphases.
  33 class ConcurrentGCPhaseManager : public StackObj {
  34 public:
  35 
  36   // Special phase ids used by all GC's that use this facility.
  37   static const int UNCONSTRAINED_PHASE = 0; // Unconstrained or no request.
  38   static const int IDLE_PHASE = 1;          // Concurrent processing is idle.
  39 
  40   // Stack of phase managers.
  41   class Stack {
  42     friend class ConcurrentGCPhaseManager;
  43 
  44   public:
  45     // Create an empty stack of phase managers.
  46     Stack();
  47 
  48   private:
  49     int _requested_phase;
  50     ConcurrentGCPhaseManager* _top;
  51 
  52     // Non-copyable - never defined.
  53     Stack(const Stack&);
  54     Stack& operator=(const Stack&);
  55   };
  56 
  57   // Construct and push a new manager on the stack, activating phase.
  58   // Notifies callers in wait_for_phase of the phase change.
  59   //
  60   // Preconditions:
  61   // - Calling thread must be a ConcurrentGC thread