docs: def get_ec_index(self, ec_handle):
          '''Get the index of the execution context with the given handle.
  
          @param ec_handle The handle of the execution context to look for.
          @type ec_handle str
          @return The index into the owned + participated arrays, suitable for
          use in methods such as @ref activate_in_ec, or -1 if the EC was not
          found.
          @raises NoECWithHandleError
  
          '''
          with self._mutex:
              for ii, ec in enumerate(self.owned_ecs):
                  if ec.handle == ec_handle:
                      return ii
              for ii, ec in enumerate(self.participating_ecs):
                  if ec.handle == ec_handle:
                      return ii + len(self.owned_ecs)
              raise exceptions.NoECWithHandleError