correction of several small bugs

pkg/obilua/mutex.go

@@ -0,0 +1,63 @@
+package obilua
+
+import (
+	lua "github.com/yuin/gopher-lua"
+
+	"sync"
+)
+
+const luaMutexTypeName = "Mutex"
+
+func registerMutexType(luaState *lua.LState) {
+	mutexType := luaState.NewTypeMetatable(luaMutexTypeName)
+	luaState.SetGlobal(luaMutexTypeName, mutexType)
+
+	luaState.SetField(mutexType, "new", luaState.NewFunction(newMutex))
+
+	luaState.SetField(mutexType, "__index",
+		luaState.SetFuncs(luaState.NewTable(),
+			mutexMethods))
+}
+
+func mutex2Lua(interpreter *lua.LState, mutex *sync.Mutex) lua.LValue {
+	ud := interpreter.NewUserData()
+	ud.Value = mutex
+	interpreter.SetMetatable(ud, interpreter.GetTypeMetatable(luaMutexTypeName))
+
+	return ud
+}
+
+func pushMutexToLua(luaState *lua.LState, mutex *sync.Mutex) {
+	luaState.Push(mutex2Lua(luaState, mutex))
+}
+func newMutex(luaState *lua.LState) int {
+	m := &sync.Mutex{}
+	pushMutexToLua(luaState, m)
+	return 1
+}
+
+var mutexMethods = map[string]lua.LGFunction{
+	"lock":   mutexLock,
+	"unlock": mutexUnlock,
+}
+
+func checkMutex(L *lua.LState) *sync.Mutex {
+	ud := L.CheckUserData(1)
+	if mutex, ok := ud.Value.(*sync.Mutex); ok {
+		return mutex
+	}
+	L.ArgError(1, "Mutex expected")
+	return nil
+}
+
+func mutexLock(L *lua.LState) int {
+	mutex := checkMutex(L)
+	mutex.Lock()
+	return 0
+}
+
+func mutexUnlock(L *lua.LState) int {
+	mutex := checkMutex(L)
+	mutex.Unlock()
+	return 0
+}