Synchronize<TSource>
using System.Runtime.CompilerServices;
namespace System.Reactive.Concurrency
{
    [System.Runtime.CompilerServices.NullableContext(1)]
    [System.Runtime.CompilerServices.Nullable(new byte[] {
        0,
        1,
        1,
        1
    })]
    internal sealed class Synchronize<[System.Runtime.CompilerServices.Nullable(2)] TSource> : Producer<TSource, Synchronize<TSource>._>
    {
        [System.Runtime.CompilerServices.Nullable(new byte[] {
            0,
            1
        })]
        internal sealed class _ : IdentitySink<TSource>
        {
            private readonly object _gate;
            public _(Synchronize<TSource> parent, IObserver<TSource> observer)
                : base(observer)
            {
                _gate = (parent._gate ?? new object());
            }
            public override void OnNext(TSource value)
            {
                lock (_gate) {
                    ForwardOnNext(value);
                }
            }
            public override void OnError(Exception error)
            {
                lock (_gate) {
                    ForwardOnError(error);
                }
            }
            public override void OnCompleted()
            {
                lock (_gate) {
                    ForwardOnCompleted();
                }
            }
        }
        private readonly IObservable<TSource> _source;
        [System.Runtime.CompilerServices.Nullable(2)]
        private readonly object _gate;
        public Synchronize(IObservable<TSource> source, object gate)
        {
            _source = source;
            _gate = gate;
        }
        public Synchronize(IObservable<TSource> source)
        {
            _source = source;
        }
        [return: System.Runtime.CompilerServices.Nullable(new byte[] {
            1,
            0
        })]
        protected override _ CreateSink(IObserver<TSource> observer)
        {
            return new _(this, observer);
        }
        protected override void Run([System.Runtime.CompilerServices.Nullable(new byte[] {
            1,
            0
        })] _ sink)
        {
            sink.Run(_source);
        }
    }
}