https://nalar.dev/tags/finalizers/ Recent content in Finalizers on Nalar Hugo en-us Wed, 16 Sep 2026 00:00:00 +0700 https://nalar.dev/go-runtime-finalizers-delay-object-reclamation/ Wed, 16 Sep 2026 00:00:00 +0700 https://nalar.dev/go-runtime-finalizers-delay-object-reclamation/ <p>A Go object with a finalizer is not reclaimed when the garbage collector first determines that it is unreachable. The runtime must retain the object for the finalizer call, and reclamation can occur only after a later collection finds the object unreachable again.</p> <p>That behavior makes <code>runtime.SetFinalizer</code> materially different from ordinary garbage collection. It adds an asynchronous lifecycle phase between loss of application reachability and memory reclamation.</p> <h2 id="finalization-temporarily-restores-reachability">Finalization temporarily restores reachability</h2> <p><code>runtime.SetFinalizer(obj, f)</code> associates <code>f</code> with <code>obj</code>. When the collector detects an unreachable object with that association, it clears the association and arranges a call to <code>f(obj)</code>.</p>