Sync with 8 months of Google-internal development.

Many things have changed and been simplified.
The memory-management story for upb_def and upb_handlers
is much more robust; upb_def and upb_handlers should be
fairly stable interfaces now.  There is still much work
to do for the runtime component (upb_sink).

1 files changed, 32 insertions, 0 deletions

diff --git a/bindings/lua/lunitx/atexit.lua b/bindings/lua/lunitx/atexit.lua
new file mode 100644
index 0000000..c3cdddc
--- /dev/null
+++ b/bindings/lua/lunitx/atexit.lua
@@ -0,0 +1,32 @@
+
+local actions = {}
+
+local atexit
+
+if _VERSION >= 'Lua 5.2' then 
+
+    atexit = function (fn)
+        actions[#actions+1] = setmetatable({}, { __gc = fn })
+    end
+    
+else
+
+    local newproxy = newproxy
+    local debug = debug
+    local assert = assert
+    local setmetatable = setmetatable
+
+    local function gc(fn)
+        local p = assert(newproxy())
+        assert(debug.setmetatable(p, { __gc = fn }))
+        return p
+    end
+
+    atexit = function (fn)
+        actions[#actions+1] = gc(fn)
+    end
+    
+end
+
+return atexit
+