в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:20:13Z

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==Lock Demo==

<p>The lock keyword is used when working with multiple threads.</p>
<p>Its general form is shown here:</p>

<source lang="csharp">lock(obj) {
// critical section
}</source>

==Multi Threaded Printing (Synchronizing Threads)==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
public class Printer {
public void PrintNumbers() {
lock (this) {
Console.WriteLine("-> {0} is executing PrintNumbers()", Thread.CurrentThread.Name);
Console.Write("Your numbers: ");
for (int i = 0; i < 10; i++) {
Random r = new Random();
Thread.Sleep(1000 * r.Next(5));
Console.Write(i + ", ");
}
Console.WriteLine();
}
}
}
class Program {
static void Main(string[] args) {
Printer p = new Printer();
Thread[] threads = new Thread[10];
for (int i = 0; i < 10; i++) {
threads[i] = new Thread(new ThreadStart(p.PrintNumbers));
threads[i].Name = string.Format("Worker thread #{0}", i);
}
foreach (Thread t in threads)
t.Start();
Console.ReadLine();
}
}</source>

==Shared resource without lock==

<source lang="csharp">using System;
using System.Threading;
class MainClass
{
private int Runs = 0;
public void CountUp()
{
while (Runs < 10)
{
int Temp = Runs;
Temp++;
Console.WriteLine(Thread.CurrentThread.Name + " " + Temp);
Thread.Sleep(1000);
Runs = Temp;
}
}
public void RunThreads()
{
Thread t2 = new Thread(new ThreadStart(CountUp));
t2.Name = "t2";
Thread t3 = new Thread(new ThreadStart(CountUp));
t3.Name = "t3";
t2.Start();
t3.Start();
}
public static void Main()
{
MainClass ex = new MainClass();
ex.RunThreads();
}
}</source>
<pre class=codeResult>t2 1
t3 1
t2 2
t3 2
t2 3
t3 3
t2 4
t3 4
t2 5
t3 5
t2 6
t3 6
t3 7
t2 7
^CTerminate batch job (Y/N)? n</pre>

==Use lock to synchronize access to an object==

<source lang="csharp">using System;
using System.Threading;

class MyThread {
public Thread thrd;

public MyThread(string name, int[] nums) {
thrd = new Thread(this.run);
thrd.Name = name;
thrd.Start();
}

void run() {
int answer = sumIt(10);
}
public int sumIt(int nums) {
lock(this) {
Console.WriteLine(Thread.CurrentThread.Name);
Thread.Sleep(100);
}
return 0;
}
}

class MainClass {
public static void Main() {
int[] a = {1, 2, 3, 4, 5};

MyThread mt1 = new MyThread("Child #1", a);
MyThread mt2 = new MyThread("Child #2", a);

mt1.thrd.Join();
mt2.thrd.Join();
}
}</source>
<pre class=codeResult>Child #1
Child #2</pre>

==Use of volatile: lock singleton==

<source lang="csharp">using System;
class Singleton
{
static object sync = new object();

static volatile Singleton singleton = null;

private Singleton()
{
}

public static Singleton GetSingleton()
{
if (singleton == null)
{
lock(sync)
{
if (singleton == null)
singleton = new Singleton();
}
}

return(singleton);
}
}</source>

==Use the lock object==

<source lang="csharp">using System;
using System.Threading;
class MainClass
{
private int Runs = 0;
public void CountUp()
{
while (Runs < 10)
{
lock(this)
{
int Temp = Runs;
Temp++;
Console.WriteLine(Thread.CurrentThread.Name + " " + Temp);
Thread.Sleep(1000);
Runs = Temp;
}
}
}
public void RunThreads()
{
Thread t2 = new Thread(new ThreadStart(CountUp));
t2.Name = "t2";
Thread t3 = new Thread(new ThreadStart(CountUp));
t3.Name = "t3";
t2.Start();
t3.Start();
}
public static void Main()
{
MainClass ex = new MainClass();
ex.RunThreads();
}
}</source>
<pre class=codeResult>t2 1
t3 2
t2 3
t3 4
t2 5
t3 6
t2 7
t3 8
t2 9
t3 10
t2 11</pre>

==Using Lock==

<source lang="csharp">using System;
using System.Threading;
class MainClass
{
static void Main(string[] args)
{
CounterWithLock me = new CounterWithLock();
Thread[] MyThreads = new Thread[10];
for (int i = 0; i > 100; i++)
{
MyThreads[i] = new Thread(new ThreadStart(me.Count));
MyThreads[i].Start();
}
}
}
class CounterWithLock
{
private int counter;

public void Count()
{
lock (this)
{
counter++;
}
}
}</source>

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Csharp/CSharp Tutorial/Thread/lock - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия