| #region Copyright notice and license |
| // Copyright 2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| #endregion |
| using System; |
| using System.Runtime.InteropServices; |
| using System.Threading.Tasks; |
| using Grpc.Core.Profiling; |
| |
| using Grpc.Core.Utils; |
| |
| namespace Grpc.Core.Internal |
| { |
| /// <summary> |
| /// grpc_completion_queue from <c>grpc/grpc.h</c> |
| /// </summary> |
| internal class CompletionQueueSafeHandle : SafeHandleZeroIsInvalid |
| { |
| static readonly NativeMethods Native = NativeMethods.Get(); |
| |
| AtomicCounter shutdownRefcount = new AtomicCounter(1); |
| CompletionRegistry completionRegistry; |
| |
| private CompletionQueueSafeHandle() |
| { |
| } |
| |
| /// <summary> |
| /// Create a completion queue that can only be used for Pluck operations. |
| /// </summary> |
| public static CompletionQueueSafeHandle CreateSync() |
| { |
| return Native.grpcsharp_completion_queue_create_sync(); |
| } |
| |
| /// <summary> |
| /// Create a completion queue that can only be used for Next operations. |
| /// </summary> |
| public static CompletionQueueSafeHandle CreateAsync(CompletionRegistry completionRegistry) |
| { |
| var cq = Native.grpcsharp_completion_queue_create_async(); |
| cq.completionRegistry = completionRegistry; |
| return cq; |
| } |
| |
| public CompletionQueueEvent Next() |
| { |
| return Native.grpcsharp_completion_queue_next(this); |
| } |
| |
| public CompletionQueueEvent Pluck(IntPtr tag) |
| { |
| return Native.grpcsharp_completion_queue_pluck(this, tag); |
| } |
| |
| /// <summary> |
| /// Creates a new usage scope for this completion queue. Once successfully created, |
| /// the completion queue won't be shutdown before scope.Dispose() is called. |
| /// </summary> |
| public UsageScope NewScope() |
| { |
| return new UsageScope(this); |
| } |
| |
| public void Shutdown() |
| { |
| DecrementShutdownRefcount(); |
| } |
| |
| /// <summary> |
| /// Completion registry associated with this completion queue. |
| /// Doesn't need to be set if only using Pluck() operations. |
| /// </summary> |
| public CompletionRegistry CompletionRegistry |
| { |
| get { return completionRegistry; } |
| } |
| |
| protected override bool ReleaseHandle() |
| { |
| Native.grpcsharp_completion_queue_destroy(handle); |
| return true; |
| } |
| |
| private void DecrementShutdownRefcount() |
| { |
| if (shutdownRefcount.Decrement() == 0) |
| { |
| Native.grpcsharp_completion_queue_shutdown(this); |
| } |
| } |
| |
| private void BeginOp() |
| { |
| bool success = false; |
| shutdownRefcount.IncrementIfNonzero(ref success); |
| GrpcPreconditions.CheckState(success, "Shutdown has already been called"); |
| } |
| |
| private void EndOp() |
| { |
| DecrementShutdownRefcount(); |
| } |
| |
| // Allows declaring BeginOp and EndOp of a completion queue with a using statement. |
| // Declared as struct for better performance. |
| public struct UsageScope : IDisposable |
| { |
| readonly CompletionQueueSafeHandle cq; |
| |
| public UsageScope(CompletionQueueSafeHandle cq) |
| { |
| this.cq = cq; |
| this.cq.BeginOp(); |
| } |
| |
| public void Dispose() |
| { |
| cq.EndOp(); |
| } |
| } |
| } |
| } |