From e7659883cc6fca343785da2a1af3890ae273abbf Mon Sep 17 00:00:00 2001
From: sfan5 <sfan5@live.de>
Date: Mon, 2 May 2022 20:55:04 +0200
Subject: Async environment for mods to do concurrent tasks (#11131)

---
 builtin/game/misc.lua | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'builtin/game/misc.lua')

diff --git a/builtin/game/misc.lua b/builtin/game/misc.lua
index 18d5a7310..9f5e3312b 100644
--- a/builtin/game/misc.lua
+++ b/builtin/game/misc.lua
@@ -235,3 +235,32 @@ end
 
 -- Used for callback handling with dynamic_add_media
 core.dynamic_media_callbacks = {}
+
+
+-- Transfer of certain globals into async environment
+-- see builtin/async/game.lua for the other side
+
+local function copy_filtering(t, seen)
+	if type(t) == "userdata" or type(t) == "function" then
+		return true -- don't use nil so presence can still be detected
+	elseif type(t) ~= "table" then
+		return t
+	end
+	local n = {}
+	seen = seen or {}
+	seen[t] = n
+	for k, v in pairs(t) do
+		local k_ = seen[k] or copy_filtering(k, seen)
+		local v_ = seen[v] or copy_filtering(v, seen)
+		n[k_] = v_
+	end
+	return n
+end
+
+function core.get_globals_to_transfer()
+	local all = {
+		registered_items = copy_filtering(core.registered_items),
+		registered_aliases = core.registered_aliases,
+	}
+	return core.serialize(all)
+end
-- 
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