src/hotspot/share/utilities/waitBarrier_generic.cpp

*** 46,56 ****
      return 0;
    }
    assert(w > 0, "Bad counting");
    // We need an exact count which never goes below zero,
    // otherwise the semaphore may be signalled too many times.
!   if (Atomic::cmpxchg(w - 1, &_waiters, w) == w) {
      _sem_barrier.signal();
      return w - 1;
    }
    return w;
  }
--- 46,56 ----
      return 0;
    }
    assert(w > 0, "Bad counting");
    // We need an exact count which never goes below zero,
    // otherwise the semaphore may be signalled too many times.
!   if (Atomic::cmpxchg(&_waiters, w, w - 1) == w) {
      _sem_barrier.signal();
      return w - 1;
    }
    return w;
  }