public static object CompareExchange(system.Reference data, object update, object expect)
{
// the real CompareExchange takes a 'ref object' first parameter,
// but we take system.Reference so we can access its CompareAndSwap method.
// this depends on CilMethod::IsInterlockedOrVolatile() -- see there.
object current = data.VolatileGet();
data.CompareAndSwap(expect, update);
return(current);
}
public static object Exchange(system.Reference data, object update)
{
for (;;)
{
object current = data.VolatileGet();
if (data.CompareAndSwap(current, update))
{
return(current);
}
}
}