關于“GUI 博士的忠告：切勿鎖定類型對象！”的實驗
1
using System;
2using System.Threading;
3
4namespace TestLab.System.Threading
5
{
6
//在遇到線程類問題的時候，我們需要注意：
7 //a線程在執(zhí)行“代碼中連續(xù)的語句”a1、a2時，并不代表他們在實際執(zhí)行時也是連續(xù)了(也許是連續(xù)的也許不是)
8 //也就是說此時b線程完全有可能在a1、a2之間做“小三”，這是上帝（CPU）的意思
9 internal class LowThread1
10
{
11 private static int _data;
12 private static object _lockObj = new object();
13 private string _name;
14
15 public int Data
16 {
17 get { return _data; }
18
}
19
20 public LowThread1(string name)
21 {
22 this._name = name;
23 Console.WriteLine("{1}創(chuàng)建新的LowLevel1對象:{0}", name, DateTime.Now);
24 }
25
26 public void FightOver1()
27 {
28 Console.WriteLine("{1}方法名:FightOver1------{0}", this._name, DateTime.Now);
29 Console.WriteLine("{2}線程名:{0}------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);
30 Console.WriteLine("{1}正在搶奪操作
------{0}", this._name, DateTime.Now);
31
32 lock (_lockObj)
33 {
34 Console.WriteLine("{2}線程名:{0} 開始操作資源.------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);
35 _data++;
36 Console.WriteLine("{2}操作完畢，現(xiàn)在的數(shù)據(jù)值:{0}------{1}", _data, this._name, DateTime.Now);
37 Console.WriteLine("{1}開始Sleep 5 秒------{0}", this._name, DateTime.Now);
38 Thread.Sleep(5000);
39 }
40
41 Console.WriteLine("{2}線程名:{0} 已經(jīng)離開操作------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);
42 }
43 public void FightOver2()
44 {
45 Console.WriteLine("{1}方法名:FightOver1------{0}", this._name, DateTime.Now);
46 Console.WriteLine("{2}線程名:{0}------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);
47 Console.WriteLine("{1}正在搶奪操作------{0}", this._name, DateTime.Now);
48
49 lock(typeof(LowThread1))
50 {
51 Console.WriteLine("{2}線程:{0} 在LowLevel1.FightOver2()中開始睡 5 秒------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);
52 Thread.Sleep(5000);
53 }
54 Console.WriteLine("{2}線程名:{0} 已經(jīng)離開操作------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);
55 }
56 public void FightOver3_1()
57 {
58 Console.WriteLine("{1}方法名:FightOver1------{0}", this._name, DateTime.Now);
59 Console.WriteLine("{2}線程名:{0}------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);
60 Console.WriteLine("{1}正在搶奪操作------{0}", this._name, DateTime.Now);
61
62 lock (this)
63 {
64 Console.WriteLine("{2}線程:{0} 在LowLevel1.FightOver2()中開始睡 5 秒------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);
65 Thread.Sleep(5000);
66 }
67 Console.WriteLine("{2}線程名:{0} 已經(jīng)離開操作------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);
68 }
69 public void FightOver3_2()
70 {
71 Console.WriteLine("{1}方法名:FightOver1------{0}", this._name, DateTime.Now);
72 Console.WriteLine("{2}線程名:{0}------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);
73 Console.WriteLine("{1}正在搶奪操作------{0}", this._name, DateTime.Now);
74
75 lock (this)
76 {
77 Console.WriteLine("{2}線程:{0} 在LowLevel1.FightOver2()中開始睡 1 秒------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);
78 Thread.Sleep(1000);
79 }
80 Console.WriteLine("{2}線程名:{0} 已經(jīng)離開操作------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);
81 }
82 }
83 public class LowThreadDrive1
84 {
85 public void Drive1()
86 {
87 LowThread1 ll1 = new LowThread1("name1");
88 LowThread1 ll2 = new LowThread1("name2");
89
90 Thread th1 = new Thread(ll1.FightOver1);
91 Thread th2 = new Thread(ll2.FightOver2);
92
93 th1.Name = "線程1";
94 th2.Name = "線程2";
95
96 th1.Start();
97 th2.Start();
98
99 }
100 public void Drive2()
101 {
102 LowThread1 ll1 = new LowThread1("ll1");
103 LowThreadHelp1 llh = new LowThreadHelp1("llh");
104
105 Thread th1 = new Thread(ll1.FightOver2);
106 Thread th2 = new Thread(llh.FightHelp2);
107
108 th1.Name = "線程1";
109 th2.Name = "線程2";
110
111 th1.Start();
112 Thread.Sleep(1000);
113 th2.Start();
114 }
115 public void Drive3()
116 {
117 LowThread1 ll1 = new LowThread1("ll1");
118 LowThreadHelp1 llh = new LowThreadHelp1("llh");
119
120 Thread th1 = new Thread(ll1.FightOver3_1);
121 Thread th2 = new Thread(llh.FightHelp3);
122
123 th1.Name = "線程1";
124 th2.Name = "線程2";
125
126 th1.Start();
127 Thread.Sleep(500);
128 th2.Start(ll1);
129 }
130 //注意 FightOver3和FightOver3_2()的不同之處在于lock塊中，線程的sleep的時間前者5s后者1s
131 //此處只是鎖住了LowThread1的一個實例，并不是所有的實例。不同實例調用lock(this)并不相關。
132 public void Drive4()
133 {
134 LowThread1 ll1 = new LowThread1("ll1");
135 LowThread1 ll2 = new LowThread1("ll2");
136
137 Thread th1 = new Thread(ll1.FightOver3_1);
138 Thread th2 = new Thread(ll2.FightOver3_2);
139
140 th1.Name = "線程1";
141 th2.Name = "線程2";
142
143 th1.Start();
144 Thread.Sleep(500);
145 th2.Start();
146 }
147 }
148 internal class LowThreadHelp1
149 {
150 private string _name;
151
152 public LowThreadHelp1(string name)
153 {
154 this._name = name;
155 Console.WriteLine("{1}創(chuàng)建新的LowLevel1Help對象:{0}", name, DateTime.Now);
156 }
157
158 //這個方法對應的是LowLevel1.FightOver2()
159 //當有線程調用LowLevel1.FightOver2()時,LowLevel1的Type對象被鎖了,需要在Lock中睡5s
160 //如果在5s內有線程調用這個FightHelp2()方法時,這個線程將被阻塞,進入線程列隊
161 //等到5s過后才能調用FightHelp2()中Lock里面的東西
162 public void FightHelp2()
163 {
164 lock (typeof(LowThread1))
165 {
166 Console.WriteLine("{1}執(zhí)行LowLevel1Help.FightHelp2():{0}", this._name, DateTime.Now);
167 }
168 }
169 //這個方法對象的是LowLevel1.FightOver3()
170 //當有線程執(zhí)行LowLevel1.FightOver2()時,執(zhí)行這個方法的對象被鎖了,需要在Lock中睡5s
171 //如果5s內有線程調用這個FightHelp3()方法時,這個線程將被阻塞,進入線程列隊
172 //等待5s過后才能調用FightHelp3()中Lock里的東西
173 public void FightHelp3(object obj)
174 {
175 LowThread1 ll1 = (LowThread1)obj;
176 lock (ll1)
177 {
178 Console.WriteLine("{1}執(zhí)行LowLevel1Help.FightHelp3()------{0}", this._name, DateTime.Now);
179 Console.WriteLine("{2}得到LowLevel1.Data:{0}------{1}", ll1.Data, this._name, DateTime.Now);
180 }
181 }
182 }
183
}
184
using System;2
using System.Threading;3
4
namespace TestLab.System.Threading5
{
6
//在遇到線程類問題的時候，我們需要注意：7
//a線程在執(zhí)行“代碼中連續(xù)的語句”a1、a2時，并不代表他們在實際執(zhí)行時也是連續(xù)了(也許是連續(xù)的也許不是)8
//也就是說此時b線程完全有可能在a1、a2之間做“小三”，這是上帝（CPU）的意思9
internal class LowThread110
{
11
private static int _data;12
private static object _lockObj = new object();13
private string _name;14
15
public int Data16
{17
get { return _data; }18
}19
20
public LowThread1(string name)21
{22
this._name = name;23
Console.WriteLine("{1}創(chuàng)建新的LowLevel1對象:{0}", name, DateTime.Now);24
}25
26
public void FightOver1()27
{28
Console.WriteLine("{1}方法名:FightOver1------{0}", this._name, DateTime.Now);29
Console.WriteLine("{2}線程名:{0}------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);30
Console.WriteLine("{1}正在搶奪操作------{0}", this._name, DateTime.Now);31
32
lock (_lockObj)33
{34
Console.WriteLine("{2}線程名:{0} 開始操作資源.------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);35
_data++;36
Console.WriteLine("{2}操作完畢，現(xiàn)在的數(shù)據(jù)值:{0}------{1}", _data, this._name, DateTime.Now);37
Console.WriteLine("{1}開始Sleep 5 秒------{0}", this._name, DateTime.Now);38
Thread.Sleep(5000);39
}40
41
Console.WriteLine("{2}線程名:{0} 已經(jīng)離開操作------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);42
}43
public void FightOver2()44
{45
Console.WriteLine("{1}方法名:FightOver1------{0}", this._name, DateTime.Now);46
Console.WriteLine("{2}線程名:{0}------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);47
Console.WriteLine("{1}正在搶奪操作------{0}", this._name, DateTime.Now);48
49
lock(typeof(LowThread1))50
{51
Console.WriteLine("{2}線程:{0} 在LowLevel1.FightOver2()中開始睡 5 秒------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);52
Thread.Sleep(5000);53
}54
Console.WriteLine("{2}線程名:{0} 已經(jīng)離開操作------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);55
}56
public void FightOver3_1()57
{58
Console.WriteLine("{1}方法名:FightOver1------{0}", this._name, DateTime.Now);59
Console.WriteLine("{2}線程名:{0}------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);60
Console.WriteLine("{1}正在搶奪操作------{0}", this._name, DateTime.Now);61
62
lock (this)63
{64
Console.WriteLine("{2}線程:{0} 在LowLevel1.FightOver2()中開始睡 5 秒------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);65
Thread.Sleep(5000);66
}67
Console.WriteLine("{2}線程名:{0} 已經(jīng)離開操作------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);68
}69
public void FightOver3_2()70
{71
Console.WriteLine("{1}方法名:FightOver1------{0}", this._name, DateTime.Now);72
Console.WriteLine("{2}線程名:{0}------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);73
Console.WriteLine("{1}正在搶奪操作------{0}", this._name, DateTime.Now);74
75
lock (this)76
{77
Console.WriteLine("{2}線程:{0} 在LowLevel1.FightOver2()中開始睡 1 秒------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);78
Thread.Sleep(1000);79
}80
Console.WriteLine("{2}線程名:{0} 已經(jīng)離開操作------{1}", Thread.CurrentThread.Name, this._name, DateTime.Now);81
}82
}83
public class LowThreadDrive184
{85
public void Drive1()86
{87
LowThread1 ll1 = new LowThread1("name1");88
LowThread1 ll2 = new LowThread1("name2");89
90
Thread th1 = new Thread(ll1.FightOver1);91
Thread th2 = new Thread(ll2.FightOver2);92
93
th1.Name = "線程1";94
th2.Name = "線程2";95
96
th1.Start();97
th2.Start();98
99
}100
public void Drive2()101
{102
LowThread1 ll1 = new LowThread1("ll1");103
LowThreadHelp1 llh = new LowThreadHelp1("llh");104
105
Thread th1 = new Thread(ll1.FightOver2);106
Thread th2 = new Thread(llh.FightHelp2);107
108
th1.Name = "線程1";109
th2.Name = "線程2";110
111
th1.Start();112
Thread.Sleep(1000);113
th2.Start();114
}115
public void Drive3()116
{117
LowThread1 ll1 = new LowThread1("ll1");118
LowThreadHelp1 llh = new LowThreadHelp1("llh");119
120
Thread th1 = new Thread(ll1.FightOver3_1);121
Thread th2 = new Thread(llh.FightHelp3);122
123
th1.Name = "線程1";124
th2.Name = "線程2";125
126
th1.Start();127
Thread.Sleep(500);128
th2.Start(ll1);129
}130
//注意 FightOver3和FightOver3_2()的不同之處在于lock塊中，線程的sleep的時間前者5s后者1s131
//此處只是鎖住了LowThread1的一個實例，并不是所有的實例。不同實例調用lock(this)并不相關。132
public void Drive4()133
{134
LowThread1 ll1 = new LowThread1("ll1");135
LowThread1 ll2 = new LowThread1("ll2");136
137
Thread th1 = new Thread(ll1.FightOver3_1);138
Thread th2 = new Thread(ll2.FightOver3_2);139
140
th1.Name = "線程1";141
th2.Name = "線程2";142
143
th1.Start();144
Thread.Sleep(500);145
th2.Start();146
}147
}148
internal class LowThreadHelp1149
{150
private string _name;151
152
public LowThreadHelp1(string name)153
{154
this._name = name;155
Console.WriteLine("{1}創(chuàng)建新的LowLevel1Help對象:{0}", name, DateTime.Now);156
}157
158
//這個方法對應的是LowLevel1.FightOver2()159
//當有線程調用LowLevel1.FightOver2()時,LowLevel1的Type對象被鎖了,需要在Lock中睡5s160
//如果在5s內有線程調用這個FightHelp2()方法時,這個線程將被阻塞,進入線程列隊161
//等到5s過后才能調用FightHelp2()中Lock里面的東西162
public void FightHelp2()163
{164
lock (typeof(LowThread1))165
{166
Console.WriteLine("{1}執(zhí)行LowLevel1Help.FightHelp2():{0}", this._name, DateTime.Now);167
}168
}169
//這個方法對象的是LowLevel1.FightOver3()170
//當有線程執(zhí)行LowLevel1.FightOver2()時,執(zhí)行這個方法的對象被鎖了,需要在Lock中睡5s171
//如果5s內有線程調用這個FightHelp3()方法時,這個線程將被阻塞,進入線程列隊172
//等待5s過后才能調用FightHelp3()中Lock里的東西173
public void FightHelp3(object obj)174
{175
LowThread1 ll1 = (LowThread1)obj;176
lock (ll1)177
{178
Console.WriteLine("{1}執(zhí)行LowLevel1Help.FightHelp3()------{0}", this._name, DateTime.Now);179
Console.WriteLine("{2}得到LowLevel1.Data:{0}------{1}", ll1.Data, this._name, DateTime.Now);180
}181
}182
}183
}184
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