58 };
  59 
  60 class VM_Handshake: public VM_Operation {
  61   HandshakeThreadsOperation* const _op;
  62   const jlong _handshake_timeout;
  63  public:
  64   bool evaluate_at_safepoint() const { return false; }
  65 
  66   bool evaluate_concurrently() const { return false; }
  67 
  68  protected:
  69 
  70   VM_Handshake(HandshakeThreadsOperation* op) :
  71       _op(op),
  72       _handshake_timeout(TimeHelper::millis_to_counter(HandshakeTimeout)) {}
  73 
  74   void set_handshake(JavaThread* target) {
  75     target->set_handshake_operation(_op);
  76   }
  77 



  78   bool poll_for_completed_thread() { return _op->thread_has_completed(); }
  79 
  80   bool handshake_has_timed_out(jlong start_time);
  81   static void handle_timeout();
  82 };
  83 
  84 bool VM_Handshake::handshake_has_timed_out(jlong start_time) {
  85   // Check if handshake operation has timed out
  86   if (_handshake_timeout > 0) {
  87     return os::elapsed_counter() >= (start_time + _handshake_timeout);
  88   }
  89   return false;
  90 }
  91 
  92 void VM_Handshake::handle_timeout() {
  93   LogStreamHandle(Warning, handshake) log_stream;
  94   MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag);
  95   ALL_JAVA_THREADS(thr) {
  96     if (thr->has_handshake()) {
  97       log_stream.print("Thread " PTR_FORMAT " has not cleared its handshake op", p2i(thr));

  58 };
  59 
  60 class VM_Handshake: public VM_Operation {
  61   HandshakeThreadsOperation* const _op;
  62   const jlong _handshake_timeout;
  63  public:
  64   bool evaluate_at_safepoint() const { return false; }
  65 
  66   bool evaluate_concurrently() const { return false; }
  67 
  68  protected:
  69 
  70   VM_Handshake(HandshakeThreadsOperation* op) :
  71       _op(op),
  72       _handshake_timeout(TimeHelper::millis_to_counter(HandshakeTimeout)) {}
  73 
  74   void set_handshake(JavaThread* target) {
  75     target->set_handshake_operation(_op);
  76   }
  77 
  78   // This method returns true for threads completed their operation
  79   // and true for threads canceled their operation.
  80   // A cancellation can happen if the thread is exiting.
  81   bool poll_for_completed_thread() { return _op->thread_has_completed(); }
  82 
  83   bool handshake_has_timed_out(jlong start_time);
  84   static void handle_timeout();
  85 };
  86 
  87 bool VM_Handshake::handshake_has_timed_out(jlong start_time) {
  88   // Check if handshake operation has timed out
  89   if (_handshake_timeout > 0) {
  90     return os::elapsed_counter() >= (start_time + _handshake_timeout);
  91   }
  92   return false;
  93 }
  94 
  95 void VM_Handshake::handle_timeout() {
  96   LogStreamHandle(Warning, handshake) log_stream;
  97   MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag);
  98   ALL_JAVA_THREADS(thr) {
  99     if (thr->has_handshake()) {
 100       log_stream.print("Thread " PTR_FORMAT " has not cleared its handshake op", p2i(thr));