src/hotspot/share/runtime/vmThread.hpp

rev 52955 : 8181143: Introduce diagnostic flag to abort VM on too long VM operations
Reviewed-by: XXX

*** 25,34 ****
--- 25,35 ----
  #ifndef SHARE_VM_RUNTIME_VMTHREAD_HPP
  #define SHARE_VM_RUNTIME_VMTHREAD_HPP
  
  #include "runtime/perfData.hpp"
  #include "runtime/thread.hpp"
+ #include "runtime/task.hpp"
  #include "runtime/vmOperations.hpp"
  
  //
  // Prioritized queue of VM operations.
  //
*** 82,91 ****
--- 83,112 ----
  
    void verify_queue(int prio) PRODUCT_RETURN;
  };
  
  
+ // VM operation timeout handling: warn or abort the VM when VM operation takes
+ // too long. Periodic tasks do not participate in safepoint protocol, and therefore
+ // can fire when application threads are stopped.
+ 
+ class VMOperationTimeoutTask : public PeriodicTask {
+ private:
+   volatile int _armed;
+   jlong _arm_time;
+ 
+ public:
+   VMOperationTimeoutTask(size_t interval_time) :
+           PeriodicTask(interval_time), _armed(0), _arm_time(0) {}
+ 
+   virtual void task();
+ 
+   bool is_armed();
+   void arm();
+   void disarm();
+ };
+ 
  //
  // A single VMThread (the primordial thread) spawns all other threads
  // and is itself used by other threads to offload heavy vm operations
  // like scavenge, garbage_collect etc.
  //
*** 99,108 ****
--- 120,131 ----
    static Monitor * _terminate_lock;
    static PerfCounter* _perf_accumulated_vm_operation_time;
  
    static const char* _no_op_reason;
  
+   static VMOperationTimeoutTask* _timeout_task;
+ 
    static bool no_op_safepoint_needed(bool check_time);
  
    void evaluate_operation(VM_Operation* op);
  
   public: