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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*
A --> B --> C --> D --> E --> A
3 threads: Thread T1 starts initialization at A, thread T2 starts initialization at C, and thread T3 starts initialization at E.
This should form a three thread deadlock, which we will detect and allow one of the three threads to proceed, breaking the deadlock.
*/
using System;
using System.Threading;
using System.Runtime.CompilerServices;
public class A
{
public static int i;
static A()
{
Console.WriteLine("In A.cctor: thread {0}: B.i {1}",Thread.CurrentThread.Name,B.i);
A.i = 5;
}
// invoking this should trigger the cctor
[MethodImpl(MethodImplOptions.NoInlining)]
public static void SomeMethod()
{
Console.WriteLine("In MyClass.SomeMethod(): thread {0}",Thread.CurrentThread.Name);
}
}
public class B
{
public static int i;
static B()
{
Console.WriteLine("In B.cctor: thread {0}: C.i {1}",Thread.CurrentThread.Name,C.i);
B.i = 6;
}
// invoking this should trigger the cctor
[MethodImpl(MethodImplOptions.NoInlining)]
public static void SomeMethod()
{
Console.WriteLine("In MyClass.SomeMethod(): thread {0}",Thread.CurrentThread.Name);
}
}
public class C
{
public static int i;
static C()
{
Console.WriteLine("In C.cctor: thread {0}: D.i {1}",Thread.CurrentThread.Name,D.i);
C.i = 7;
}
// invoking this should trigger the cctor
[MethodImpl(MethodImplOptions.NoInlining)]
public static void SomeMethod()
{
Console.WriteLine("In MyClass.SomeMethod(): thread {0}",Thread.CurrentThread.Name);
}
}
public class D
{
public static int i;
static D()
{
Console.WriteLine("In D.cctor: thread {0}: E.i {1}",Thread.CurrentThread.Name,E.i);
D.i = 8;
}
// invoking this should trigger the cctor
[MethodImpl(MethodImplOptions.NoInlining)]
public static void SomeMethod()
{
Console.WriteLine("In MyClass.SomeMethod(): thread {0}",Thread.CurrentThread.Name);
}
}
public class E
{
public static int i;
static E()
{
Console.WriteLine("In E.cctor: thread {0}: A.i {1}",Thread.CurrentThread.Name,A.i);
E.i = 9;
}
// invoking this should trigger the cctor
[MethodImpl(MethodImplOptions.NoInlining)]
public static void SomeMethod()
{
Console.WriteLine("In MyClass.SomeMethod(): thread {0}",Thread.CurrentThread.Name);
}
}
public class Test
{
public static void RunGetA()
{
A.SomeMethod();
}
public static void RunGetC()
{
C.SomeMethod();
}
public static void RunGetE()
{
E.SomeMethod();
}
public static int Main()
{
Thread t1 = new Thread(RunGetA);
t1.Name = "T1";
Thread t2 = new Thread(RunGetC);
t2.Name = "T2";
Thread t3 = new Thread(RunGetE);
t3.Name = "T3";
t1.Start();
Thread.Sleep(1000*1); // 1 second
t2.Start();
Thread.Sleep(1000*1); // 1 second
t3.Start();
t3.Join();
t2.Join();
t1.Join();
// make sure that statics were set correctly
if ( A.i == 5 && B.i == 6 && C.i == 7 && D.i == 8 && E.i == 9 )
{
Console.WriteLine("PASS");
return 100;
}
else
{
Console.WriteLine("FAIL");
return 101;
}
}
}
|
