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#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
{
AtomicCounter shutdownRefcount = new AtomicCounter(1);
[DllImport("grpc_csharp_ext.dll")]
static extern CompletionQueueSafeHandle grpcsharp_completion_queue_create();
[DllImport("grpc_csharp_ext.dll")]
static extern void grpcsharp_completion_queue_shutdown(CompletionQueueSafeHandle cq);
[DllImport("grpc_csharp_ext.dll")]
static extern CompletionQueueEvent grpcsharp_completion_queue_next(CompletionQueueSafeHandle cq);
[DllImport("grpc_csharp_ext.dll")]
static extern CompletionQueueEvent grpcsharp_completion_queue_pluck(CompletionQueueSafeHandle cq, IntPtr tag);
[DllImport("grpc_csharp_ext.dll")]
static extern void grpcsharp_completion_queue_destroy(IntPtr cq);
private CompletionQueueSafeHandle()
{
}
public static CompletionQueueSafeHandle Create()
{
return grpcsharp_completion_queue_create();
}
public CompletionQueueEvent Next()
{
return grpcsharp_completion_queue_next(this);
}
public CompletionQueueEvent Pluck(IntPtr tag)
{
using (Profilers.ForCurrentThread().NewScope("CompletionQueueSafeHandle.Pluck"))
{
return 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();
}
protected override bool ReleaseHandle()
{
grpcsharp_completion_queue_destroy(handle);
return true;
}
private void DecrementShutdownRefcount()
{
if (shutdownRefcount.Decrement() == 0)
{
grpcsharp_completion_queue_shutdown(this);
}
}
private void BeginOp()
{
bool success = false;
shutdownRefcount.IncrementIfNonzero(ref success);
Preconditions.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();
}
}
}
}
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