The extended interface

• counter_create — Creates a counter which maintains a single numeric value.
• counter_get_value — Get the current value of a counter resource.
• counter_bump_value — Change the current value of a counter resource.
• counter_reset_value — Reset the current value of a counter resource.
• counter_get_meta — Return a piece of metainformation about a counter resource.
• counter_get_named — Retrieve an existing named counter as a resource.