Memory Barrier by lock statement
- by jalalaldeen
I read recently about memory barrier and the reordaring issue and now I have some confusion about it.
Let us have a following senario:
private object _object1 = null;
private object _object2 = null;
private bool _usingObject1 = false;
private object MyObject
{
get
{
if (_usingObject1)
{
return _object1;
}
else
{
return _object2;
}
}
set
{
if (_usingObject1)
{
_object1 = value;
}
else
{
_object2 = value;
}
}
}
private void Update()
{
_usingMethod1 = true;
SomeProperty = FooMethod();
//..
_usingMethod1 = false;
}
1- At Update method; is it always _usingMethod1 = true statement excecuted before getting or setting the property? or due reordaring issue we can not garantee that?
2- Should we use volitle like.
private volitle bool _usingMethod1 = false;
3- If we use lock; can we garantee then every statement within the lock will be excecuted in order like:
private void FooMethod()
{
object locker = new object();
lock (locker)
{
x = 1;
y = a;
i++;
}
}
Thanks in advanced..
