diff --git a/sys/apis/fs/netfs.lua b/sys/apis/fs/netfs.lua
index 58089a4..d7eb2eb 100644
--- a/sys/apis/fs/netfs.lua
+++ b/sys/apis/fs/netfs.lua
@@ -1,5 +1,5 @@
 local Socket       = require('socket')
-local synchronized = require('sync')
+local synchronized = require('sync').sync
 
 local fs = _G.fs
 
diff --git a/sys/apis/sync.lua b/sys/apis/sync.lua
index e0b841e..7987cb4 100644
--- a/sys/apis/sync.lua
+++ b/sys/apis/sync.lua
@@ -1,26 +1,61 @@
-local syncLocks = { }
+local Sync = {
+  syncLocks = { }
+}
 
 local os = _G.os
 
-return function(obj, fn)
+function Sync.sync(obj, fn)
   local key = tostring(obj)
-  if syncLocks[key] then
+  if Sync.syncLocks[key] then
     local cos = tostring(coroutine.running())
-    table.insert(syncLocks[key], cos)
+    table.insert(Sync.syncLocks[key], cos)
     repeat
       local _, co = os.pullEvent('sync_lock')
     until co == cos
   else
-    syncLocks[key] = { }
+    Sync.syncLocks[key] = { }
   end
   local s, m = pcall(fn)
-  local co = table.remove(syncLocks[key], 1)
+  local co = table.remove(Sync.syncLocks[key], 1)
   if co then
     os.queueEvent('sync_lock', co)
   else
-    syncLocks[key] = nil
+    Sync.syncLocks[key] = nil
   end
   if not s then
     error(m)
   end
 end
+
+function Sync.lock(obj)
+  local key = tostring(obj)
+  if Sync.syncLocks[key] then
+    local cos = tostring(coroutine.running())
+    table.insert(Sync.syncLocks[key], cos)
+    repeat
+      local _, co = os.pullEvent('sync_lock')
+    until co == cos
+  else
+    Sync.syncLocks[key] = { }
+  end
+end
+
+function Sync.release(obj)
+  local key = tostring(obj)
+  if not Sync.syncLocks[key] then
+    error('Sync.release: Lock was not obtained', 2)
+  end
+  local co = table.remove(Sync.syncLocks[key], 1)
+  if co then
+    os.queueEvent('sync_lock', co)
+  else
+    Sync.syncLocks[key] = nil
+  end
+end
+
+function Sync.isLocked(obj)
+  local key = tostring(obj)
+  return not not Sync.syncLocks[key]
+end
+
+return Sync
diff --git a/sys/apis/ui.lua b/sys/apis/ui.lua
index ead3543..fbc3f5c 100644
--- a/sys/apis/ui.lua
+++ b/sys/apis/ui.lua
@@ -2959,6 +2959,7 @@ UI.Chooser.defaults = {
 	choices = { },
 	nochoice = 'Select',
 	backgroundFocusColor = colors.lightGray,
+	textInactiveColor = colors.gray,
 	leftIndicator = '<',
 	rightIndicator = '>',
 	height = 1,
@@ -2981,13 +2982,14 @@ function UI.Chooser:draw()
 	if self.focused then
 		bg = self.backgroundFocusColor
 	end
+	local fg = self.inactive and self.textInactiveColor or self.textColor
 	local choice = Util.find(self.choices, 'value', self.value)
 	local value = self.nochoice
 	if choice then
 		value = choice.name
 	end
 	self:write(1, 1, self.leftIndicator, self.backgroundColor, colors.black)
-	self:write(2, 1, ' ' .. Util.widthify(tostring(value), self.width-4) .. ' ', bg)
+	self:write(2, 1, ' ' .. Util.widthify(tostring(value), self.width-4) .. ' ', bg, fg)
 	self:write(self.width, 1, self.rightIndicator, self.backgroundColor, colors.black)
 end
 
diff --git a/sys/extensions/6.tl3.lua b/sys/extensions/6.tl3.lua
index 3985dcf..d82930a 100644
--- a/sys/extensions/6.tl3.lua
+++ b/sys/extensions/6.tl3.lua
@@ -7,7 +7,7 @@ _G.requireInjector(_ENV)
 local Pathing      = require('turtle.pathfind')
 local GPS          = require('gps')
 local Point        = require('point')
-local synchronized = require('sync')
+local synchronized = require('sync').sync
 local Util         = require('util')
 
 local os         = _G.os
diff --git a/sys/kernel.lua b/sys/kernel.lua
index b130204..b686bd8 100644
--- a/sys/kernel.lua
+++ b/sys/kernel.lua
@@ -34,6 +34,12 @@ _G._debug = function(pattern, ...)
 	term.redirect(oldTerm)
 end
 
+if not _G.debug then -- don't clobber lua debugger
+	function _G.debug(...)
+		_G._debug(...)
+	end
+end
+
 -- any function that runs in a kernel hook does not run in
 -- a separate coroutine or have a window. an error in a hook
 -- function will crash the system.