public Task RegisterSources(IEnumerable <IConfigurationSource> sources)
{
List <IConfigurationSource> initial;
List <IConfigurationSource> tmp;
var latch = new Latch();
do
{
initial = _sources;
tmp = new List <IConfigurationSource>(initial);
foreach (var source in sources)
{
if (tmp.Contains(source))
{
break;
}
source.OnInitialized = () => latch.Decrement();
tmp.Add(source);
latch.Increment();
}
}while (Interlocked.CompareExchange(ref _sources, tmp, initial) != initial);
EnsuresPolling();
return(latch.Task);
}
