| #region Copyright notice and license |
| // Copyright 2015 gRPC authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| #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; |
| 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; |
| cq.shutdownRefcount = new AtomicCounter(1); |
| 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 == null || shutdownRefcount.Decrement() == 0) |
| { |
| Native.grpcsharp_completion_queue_shutdown(this); |
| } |
| } |
| |
| private void BeginOp() |
| { |
| if (shutdownRefcount != null) |
| { |
| bool success = false; |
| shutdownRefcount.IncrementIfNonzero(ref success); |
| GrpcPreconditions.CheckState(success, "Shutdown has already been called"); |
| } |
| } |
| |
| private void EndOp() |
| { |
| if (shutdownRefcount != null) |
| { |
| 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(); |
| } |
| } |
| } |
| } |