Name
fence_is_signaled_locked — 
     Return an indication if the fence is signaled yet.
 
Arguments
- fence
- 
     [in]	the fence to check
     
Description
   Returns true if the fence was already signaled, false if not. Since this
   function doesn't enable signaling, it is not guaranteed to ever return
   true if fence_add_callback, fence_wait or fence_enable_sw_signaling
   haven't been called before.
   
   This function requires fence->lock to be held.