772   // We check with locking because another thread that has not yet

   772   // We check to see if this thread is suspended without locking to

   773   // synchronized may be trying to suspend this one.

   773   // avoid deadlocking with a third thread that is waiting for this

   774   bool is_suspended = _thread->is_any_suspended_with_lock();

   774   // thread to be suspended. The third thread can notice the safepoint

   775   // that we're trying to start at the beginning of its SR_lock->wait()

   776   // call. If that happens, then the third thread will block on the

   777   // safepoint while still holding the underlying SR_lock. We won't be

   778   // able to get the SR_lock and we'll deadlock.

   779   //

   780   // We don't need to grab the SR_lock here for two reasons:

   781   // 1) The suspend flags are both volatile and are set with an

   782   //    Atomic::cmpxchg() call so we should see the suspended

   783   //    state right away.

   784   // 2) We're being called from the safepoint polling loop; if

   785   //    we don't see the suspended state on this iteration, then

   786   //    we'll come around again.

   787   //

   788   bool is_suspended = _thread->is_ext_suspended();