| -- track collections | |
| local M = {} | |
| -- import list | |
| local setmetatable, stderr, collectgarbage = | |
| setmetatable, io.stderr, collectgarbage | |
| _ENV = nil | |
| local active = false | |
| -- each time a table is collected, remark it for finalization on next | |
| -- cycle | |
| local mt = {} | |
| function mt.__gc (o) | |
| stderr:write'.' -- mark progress | |
| if active then | |
| setmetatable(o, mt) -- remark object for finalization | |
| end | |
| end | |
| function M.start () | |
| if not active then | |
| active = true | |
| setmetatable({}, mt) -- create initial object | |
| end | |
| end | |
| function M.stop () | |
| if active then | |
| active = false | |
| collectgarbage() -- call finalizer for the last time | |
| end | |
| end | |
| return M | |