1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
#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);
private CompletionQueueSafeHandle()
{
}
public static CompletionQueueSafeHandle Create()
{
return Native.grpcsharp_completion_queue_create();
}
public CompletionQueueEvent Next()
{
return Native.grpcsharp_completion_queue_next(this);
}
public CompletionQueueEvent Pluck(IntPtr tag)
{
using (Profilers.ForCurrentThread().NewScope("CompletionQueueSafeHandle.Pluck"))
{
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();
}
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();
}
}
}
}
|
