refactor parallel code

openos/dmesg.lua

@@ -0,0 +1,33 @@
+local tty = require("openos.tty")
+
+local args = {...}
+local gpu = tty.gpu()
+io.write("Press 'Ctrl-C' to exit\n")
+local events = { }
+for _, e in pairs(args) do
+  events[e] = true
+end
+--pcall(function()
+  repeat
+    local evt = table.pack(os.pullEventRaw())
+    if #args == 0 or events[evt[1]] then
+      gpu.setForeground(0xCC2200)
+      io.write("[" .. math.floor(os.clock("utc")) .. "] ")
+      gpu.setForeground(0x44CC00)
+      io.write(tostring(evt[1]) .. string.rep(" ", math.max(12 - #tostring(evt[1]), 0) + 1))
+      gpu.setForeground(0xB0B00F)
+      io.write(tostring(evt[2]) .. string.rep(" ", 37 - #tostring(evt[2])))
+      gpu.setForeground(0xFFFFFF)
+      if evt.n > 2 then
+        for i = 3, evt.n do
+          io.write("  " .. tostring(evt[i]))
+        end
+      end
+
+      io.write("\n")
+    end
+  until evt[1] == "terminate"
+--end)
+
+gpu.setForeground(0xFFFFFF)
+