release method

void release(T resource)

Returns resource to the pool. A waiting borrower (if any) receives it directly; otherwise it becomes idle. After close, the resource is simply dropped from the count (not disposed here — see close). Audited: 2026-06-12 11:26 EDT

Implementation

void release(T resource) {
  if (_isClosed) {
    // Pool is shut down: drop the resource from the live count. Disposal is
    // not performed here because this method is synchronous and cannot await a
    // disposer. The close method disposes the idle resources it holds, while a
    // resource still checked out at shutdown belongs to the caller — return
    // resources before closing, or dispose that one directly.
    _created--;
    return;
  }
  if (_waiters.isNotEmpty) {
    _waiters.removeAt(0).complete(resource);
    return;
  }
  _idle.add(resource);
}