/
Locker.cs
173 lines (147 loc) · 4.18 KB
/
Locker.cs
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
164
165
166
167
168
169
170
171
172
173
using System;
using System.Collections.Generic;
using System.Threading;
namespace Locker
{
public class Locker
{
#region Locks
private static Object _masterLock = new object();
private static Dictionary<String, Object> _locks;
private static Dictionary<String, Object> Locks
{
get
{
if (_locks == null)
_locks = new Dictionary<String, Object>();
return _locks;
}
}
#endregion
#region Keys
private static List<String> _keys;
private static List<String> Keys
{
get
{
if (_keys == null)
_keys = new List<String>();
return _keys;
}
}
#endregion
#region Methods
public static void AddLock(String name)
{
lock (_masterLock)
{
if (Locks.ContainsKey(name))
{
throw new Exception(String.Format("Specified lock with name {0} already exists", name));
}
else
{
for (int i = 0; i < Keys.Count; i++)
{
if (name.CompareTo(Keys[i]) < 0)
{
lock (Locks[Keys[i]])
{
Keys.Insert(i, name);
}
break;
}
}
if (!Keys.Contains(name))
{
Keys.Add(name);
}
Locks.Add(name, new object());
}
}
}
public static void RemoveLock(String name)
{
lock (_masterLock)
{
if (Locks.ContainsKey(name))
{
lock (Locks[name])
{
Keys.Remove(name);
Locks.Remove(name);
}
}
else
{
throw new Exception(String.Format("Specified lock with name {0} does not exist", name));
}
}
}
private static Boolean Lock(String name)
{
Boolean locked = false;
int index = 0;
lock (_masterLock)
{
if (Locks.ContainsKey(name))
{
index = Keys.IndexOf(name);
for (int i = 0; i < index; i++)
{
Monitor.Enter(Locks[Keys[i]]);
}
Monitor.Enter(Locks[name]);
locked = true;
}
else
{
locked = false;
throw new Exception(String.Format("Specified lock with name {0} does not exist", name));
}
}
return locked;
}
private static void Unlock(String name)
{
int index = 0;
lock (_masterLock)
{
if (Locks.ContainsKey(name))
{
index = Keys.IndexOf(name);
for (int i = 0; i < index; i++)
{
Monitor.Exit(Locks[Keys[i]]);
}
Monitor.Exit(Locks[name]);
}
else
{
throw new Exception(String.Format("Specified lock with name {0} does not exist", name));
}
}
}
public static void Lock(String name, Action work)
{
try
{
if (Lock(name))
work();
}
finally
{
Unlock(name);
}
}
public static void Reset()
{
lock (_masterLock)
{
Locks.Clear();
Keys.Clear();
}
}
#endregion
}
}