T InitValue()
{
Func <T> init_factory;
T v;
switch (mode)
{
case LazyThreadSafetyMode.None:
init_factory = factory;
if (init_factory == null)
{
throw exception = new InvalidOperationException("The initialization function tries to access Value on this instance");
}
try
{
factory = null;
v = init_factory();
value = v;
Thread.MemoryBarrier();
inited = true;
}
catch (Exception ex)
{
exception = ex;
throw;
}
break;
case LazyThreadSafetyMode.PublicationOnly:
init_factory = factory;
//exceptions are ignored
if (init_factory != null)
{
v = init_factory();
}
else
{
v = default(T);
}
lock (monitor)
{
if (inited)
{
return(value);
}
value = v;
Thread.MemoryBarrier();
inited = true;
factory = null;
}
break;
case LazyThreadSafetyMode.ExecutionAndPublication:
lock (monitor)
{
if (inited)
{
return(value);
}
if (factory == null)
{
throw exception = new InvalidOperationException("The initialization function tries to access Value on this instance");
}
init_factory = factory;
try
{
factory = null;
v = init_factory();
value = v;
Thread.MemoryBarrier();
inited = true;
}
catch (Exception ex)
{
exception = ex;
throw;
}
}
break;
default:
throw new InvalidOperationException("Invalid LazyThreadSafetyMode " + mode);
}
return(value);
}