ConcurrentQueueSemaphore.NetStandard.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System.Threading;
using System.Threading.Tasks;

namespace Microsoft.Data.SqlClient.SNI
{
    internal sealed partial class ConcurrentQueueSemaphore
    {
        public Task WaitAsync(CancellationToken cancellationToken)
        {
            var tcs = new TaskCompletionSource<bool>();
            _queue.Enqueue(tcs);
            _semaphore.WaitAsync().ContinueWith(
                continuationAction: s_continuePop,
                state: _queue,
                cancellationToken: cancellationToken
            );
            return tcs.Task;
        }
    }
}