code: def release(self, num_instances: int = 1) -> None:
          
          proc = Process.current()
          error_format = "Process %s holds %s instances, but requests to release more (%s)"
          if self._usage.get(proc, 0) > 0:
              if num_instances > self._usage[proc]:
                  raise ValueError(
                      error_format % (proc.local.name, self._usage[proc], num_instances)
                  )
              self._usage[proc] -= num_instances
              self._num_instances_free += num_instances
              if _logger is not None:
                  self._log(
                      INFO,
                      "release",
                      num_instances=num_instances,
                      keeping=self._usage[proc],
                      free=self.num_instances_free
                  )
              if self._usage[proc] <= 0:
                  del self._usage[proc]
              if not self._waiting.is_empty():
                  num_instances_next = cast(int, self._waiting.peek().local.__num_instances_required)
                  if num_instances_next <= self.num_instances_free:
                      self._waiting.pop()
                  elif _logger is not None:
                      self._log(DEBUG, "release-nopop", next_requires=num_instances_next, free=self.num_instances_free)
              elif _logger is not None:
                  self._log(DEBUG, "release-queueempty")
          else:
              raise RuntimeError(
                  f"Process {proc.local.name} tries to release {num_instances} instances, but is holding none.)"
              )
docs: The current process releases instances it has previously taken. It may thus release less than it has taken.
          These released instances become free. If the total number of free instances then satisfy the request of the top
          process of the waiting queue, it is popped off the queue and resumed.