Sleep for unused tick time & optional realtime

- Optional luasocket dependency for realtime measurements (instead of CPU time)
- lua_async.run() will wait for the time to be ready

1 files changed, 19 insertions, 2 deletions

diff --git a/util.lua b/util.lua
index 7061c06..dbef0b5 100644
--- a/util.lua
+++ b/util.lua
@@ -27,13 +27,30 @@ function lua_async.resume(co)
 end
 
 function lua_async.run()
-	local last_time = os.clock()
+	assert(lua_async.socket)
+	local last_time = lua_async.clock()
 
 	while true do
-		local current_time = os.clock()
+		local current_time = lua_async.clock()
 		local dtime = current_time - last_time
 		last_time = current_time
 
 		lua_async.step(dtime)
+
+		local next = math.huge
+
+		for _, timeout in pairs(lua_async.timeouts.pool)
+			next = math.min(next, timeout.time_left)
+		end
+
+		for _, interval in pairs(lua_async.intervals.pool)
+			next = math.min(next, interval.time_left)
+		end
+
+		if next == math.huge then
+			return
+		end
+
+		lua_async.socket.sleep(next)
 	end
 end