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
|
#if NET_4_0
//
// TaskScheduler.cs
//
// Author:
// Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
//
// Copyright (c) 2009 Jérémie "Garuma" Laval
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Threading;
using System.Collections.Generic;
namespace System.Threading.Tasks
{
public abstract class TaskScheduler
{
static TaskScheduler defaultScheduler = new Scheduler ();
[ThreadStatic]
static TaskScheduler currentScheduler;
int id;
static int lastId = int.MinValue;
protected TaskScheduler ()
{
this.id = Interlocked.Increment (ref lastId);
}
// FIXME: Probably not correct
public static TaskScheduler FromCurrentSynchronizationContext ()
{
return Current;
}
public static TaskScheduler Default {
get {
return defaultScheduler;
}
}
public static TaskScheduler Current {
get {
if (Task.Current != null && currentScheduler != null)
return currentScheduler;
return defaultScheduler;
}
internal set {
currentScheduler = value;
}
}
public int Id {
get {
return id;
}
}
public virtual int MaximumConcurrencyLevel {
get {
return Environment.ProcessorCount;
}
}
protected abstract IEnumerable<Task> GetScheduledTasks ();
protected internal abstract void QueueTask (Task task);
protected internal virtual bool TryDequeue (Task task)
{
throw new NotSupportedException ();
}
internal protected bool TryExecuteTask (Task task)
{
throw new NotSupportedException ();
}
protected abstract bool TryExecuteTaskInline (Task task, bool taskWasPreviouslyQueued);
}
}
#endif
|
