internal void Swap()
{
while (Interlocked.CompareExchange(ref pendingSlot, 1, 0) != 0)
{
;
}
//inactive = Interlocked.Exchange(ref active, inactive);
ResourceProperties temp = active;
active = inactive;
inactive = temp;
Interlocked.Decrement(ref pendingSlot);
}
public void Unload(IEvent evt)
{
while ((Interlocked.CompareExchange(ref pendingOperation, 1, 0) == 1))
{
;
}
switch (inactive.state)
{
case ResourceState.Ready:
while (inactive.resource.IsAcquired)
{
;
}
inactive.state = ResourceState.Unloading;
resourceLoader.Unload(this, evt);
return;
case ResourceState.Empty:
switch (active.state)
{
case ResourceState.Ready:
while (Interlocked.CompareExchange(ref pendingSlot, 1, 0) != 0)
{
;
}
while (active.resource.IsAcquired)
{
;
}
ResourceProperties temp = active;
active = inactive;
inactive = temp;
Interlocked.Decrement(ref pendingSlot);
inactive.state = ResourceState.Unloading;
resourceLoader.Unload(this, evt);
return;
case ResourceState.Empty:
Interlocked.Decrement(ref pendingOperation);
evt.Finish();
return;
case ResourceState.Loading:
throw new NotSupportedException("tried to unload resource while loading");
case ResourceState.Unloading:
throw new NotSupportedException("tried to unload resource while unloading");
default:
throw new NotSupportedException("this should never occur!");
}
case ResourceState.Loading:
throw new NotSupportedException("tried to unload resource while loading");
case ResourceState.Unloading:
throw new NotSupportedException("tried to unload resource while unloading");
default:
throw new NotSupportedException("this should never occur!");
}
}
public void Unload()
{
if ((Interlocked.CompareExchange(ref pendingOperation, 1, 0) == 0))
{
switch (inactive.state)
{
case ResourceState.Ready:
if (inactive.resource.IsAcquired)
{
Interlocked.Decrement(ref pendingOperation);
}
else
{
inactive.state = ResourceState.Unloading;
resourceLoader.Unload(this);
}
return;
case ResourceState.Empty:
switch (active.state)
{
case ResourceState.Ready:
bool swapped = false;
while (Interlocked.CompareExchange(ref pendingSlot, 1, 0) != 0)
{
;
}
if (!active.resource.IsAcquired)
{
ResourceProperties temp = active;
active = inactive;
inactive = temp;
swapped = true;
}
Interlocked.Decrement(ref pendingSlot);
if (swapped)
{
inactive.state = ResourceState.Unloading;
resourceLoader.Unload(this);
}
else
{
Interlocked.Decrement(ref pendingOperation);
}
return;
case ResourceState.Empty:
Interlocked.Decrement(ref pendingOperation);
return;
case ResourceState.Loading:
throw new NotSupportedException("tried to unload resource while loading");
case ResourceState.Unloading:
throw new NotSupportedException("tried to unload resource while unloading");
default:
throw new NotSupportedException("this should never occur!");
}
case ResourceState.Loading:
throw new NotSupportedException("tried to unload resource while loading");
case ResourceState.Unloading:
throw new NotSupportedException("tried to unload resource while unloading");
default:
throw new NotSupportedException("this should never occur!");
}
}
}