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code/controllers/subsystem/processing/processing.dm

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+//Used to process objects. Fires once every second.
+
+SUBSYSTEM_DEF(processing)
+	name = "Processing"
+	priority = FIRE_PRIORITY_PROCESS
+	flags = SS_BACKGROUND|SS_POST_FIRE_TIMING|SS_NO_INIT
+	wait = 10
+
+	var/stat_tag = "P" //Used for logging
+	var/list/processing = list()
+	var/list/currentrun = list()
+
+/datum/controller/subsystem/processing/stat_entry()
+	..("[stat_tag]:[processing.len]")
+
+/datum/controller/subsystem/processing/fire(resumed = 0)
+	if (!resumed)
+		currentrun = processing.Copy()
+	//cache for sanic speed (lists are references anyways)
+	var/list/current_run = currentrun
+
+	while(current_run.len)
+		var/datum/thing = current_run[current_run.len]
+		current_run.len--
+		if(QDELETED(thing))
+			processing -= thing
+		else if(thing.process(wait) == PROCESS_KILL)
+			// fully stop so that a future START_PROCESSING will work
+			STOP_PROCESSING(src, thing)
+		if (MC_TICK_CHECK)
+			return
+
+/datum/proc/process()
+	set waitfor = 0
+	return PROCESS_KILL