diff --git a/lib/isc/include/isc/quota.h b/lib/isc/include/isc/quota.h
index a16e0964ae..079a5c9cc8 100644
--- a/lib/isc/include/isc/quota.h
+++ b/lib/isc/include/isc/quota.h
@@ -87,6 +87,21 @@ isc_quota_release(isc_quota_t *quota);
  * Release one unit of quota.
  */
 
+isc_result_t
+isc_quota_attach(isc_quota_t *quota, isc_quota_t **p);
+/*
+ * Like isc_quota_reserve, and also attaches '*p' to the
+ * quota if successful.
+ */
+
+void
+isc_quota_detach(isc_quota_t **p);
+/*
+ * Like isc_quota_release, and also detaches '*p' from the
+ * quota.
+ */
+
+
 ISC_LANG_ENDDECLS
 
 #endif /* ISC_QUOTA_H */
diff --git a/lib/isc/quota.c b/lib/isc/quota.c
index add4d6eb86..69a6ef1703 100644
--- a/lib/isc/quota.c
+++ b/lib/isc/quota.c
@@ -55,4 +55,22 @@ isc_quota_release(isc_quota_t *quota) {
 	UNLOCK(&quota->lock);	
 }
 
+isc_result_t
+isc_quota_attach(isc_quota_t *quota, isc_quota_t **p)
+{
+	isc_result_t result;
+	INSIST(p != NULL && *p == NULL);
+	result = isc_quota_reserve(quota);
+	if (result != ISC_R_SUCCESS)
+		return (result);
+	*p = quota;
+	return (ISC_R_SUCCESS);
+}
 
+void
+isc_quota_detach(isc_quota_t **p)
+{
+	INSIST(p != NULL && *p != NULL);
+	isc_quota_release(*p);
+	*p = NULL;
+}