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开源中国 2018 年度最后一场技术盛会邀你来约~错过就要等明年啦!点此立即预约
语言: C#
分类: 编程语言基础
最后更新于 2018-12-09 10:08
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创建线程
原始数据 复制代码
using System;
using System.Threading;
namespace MulityThreadNote
{
class Program
{
static void Main(string[] args)
{
Thread t1 = new Thread(new ThreadStart(PrintNumbers));//无参数的委托
t1.Start();
Thread t2 = new Thread(new ParameterizedThreadStart(PrintNumbers));//有参数的委托
t2.Start(10);
Console.ReadLine();
}
static void PrintNumbers()
{
Console.WriteLine("Starting...");
for (int i = 0; i < 10; i++)
{
Console.WriteLine(i);
}
}
//注意:要使用ParameterizedThreadStart,定义的参数必须为object
static void PrintNumbers(object count)
{
Console.WriteLine("Starting...");
for (int i = 0; i < Convert.ToInt32(count); i++)
{
Console.WriteLine(i);
}
}
}
}
暂停线程
原始数据 复制代码
using System;
using System.Threading;
namespace MulityThreadNote
{
class Program
{
static void Main(string[] args)
{
Thread t1 = new Thread(PrintNumbersWithDelay);
t1.Start();
PrintNumbers();
Console.ReadLine();
}
static void PrintNumbers()
{
Console.WriteLine("Starting...");
for (int i = 0; i < 10; i++)
{
Console.WriteLine(i);
}
}
static void PrintNumbersWithDelay()
{
Console.WriteLine("Starting...");
for (int i = 0; i < 10; i++)
{
Thread.Sleep(TimeSpan.FromSeconds(2));
Console.WriteLine(i);
}
}
}
}
线程等待
原始数据 复制代码
using System;
using System.Threading;
namespace MulityThreadNote
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Starting...");
Thread t = new Thread(PrintNumbersWithDelay);
t.Start();
t.Join(); //使用Join等待t完成
PrintNumbers();
Console.WriteLine("THread Complete");
Console.ReadLine();
}
static void PrintNumbers()
{
Console.WriteLine("Starting...");
for (int i = 0; i < 10; i++)
{
Console.WriteLine(i);
}
}
static void PrintNumbersWithDelay()
{
Console.WriteLine("Starting...");
for (int i = 0; i < 10; i++)
{
Thread.Sleep(TimeSpan.FromSeconds(2));
Console.WriteLine(i);
}
}
}
}
终止线程
原始数据 复制代码
using System;
using System.Threading;
namespace MulityThreadNote
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Starting Program...");
Thread t1 = new Thread(PrintNumbersWithDelay);
t1.Start();
Thread.Sleep(TimeSpan.FromSeconds(6));
t1.Abort(); //使用Abort()终止线程
Console.WriteLine("Thread t1 has been aborted");
Thread t2 = new Thread(PrintNumbers);
PrintNumbers();
Console.ReadLine();
}
static void PrintNumbers()
{
Console.WriteLine("Starting...");
for (int i = 0; i < 10; i++)
{
Console.WriteLine(i);
}
}
static void PrintNumbersWithDelay()
{
Console.WriteLine("Starting...");
for (int i = 0; i < 10; i++)
{
Thread.Sleep(TimeSpan.FromSeconds(2));
Console.WriteLine(i);
}
}
}
}
检测线程状态
原始数据 复制代码
using System;
using System.Threading;
namespace MulityThreadNote
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Start Program...");
Thread t1 = new Thread(PrintNumbersWithStatus);
Thread t2 = new Thread(DoNothing);
Console.WriteLine(t1.ThreadState.ToString());//获取实例线程状态
t2.Start();
t1.Start();
for (int i = 0; i < 30; i++)
{
Console.WriteLine(t1.ThreadState.ToString());
}
Thread.Sleep(TimeSpan.FromSeconds(6));
t1.Abort();
Console.WriteLine("thread t1 has been aborted");
Console.WriteLine(t1.ThreadState.ToString());
Console.WriteLine(t2.ThreadState.ToString());
Console.ReadLine();
}
private static void PrintNumbersWithStatus()
{
Console.WriteLine("Starting...");
Console.WriteLine(Thread.CurrentThread.ThreadState.ToString());//获取当前线程状态
for (int i = 0; i < 10; i++)
{
Thread.Sleep(TimeSpan.FromSeconds(2));
Console.WriteLine(i);
}
}
private static void DoNothing()
{
Thread.Sleep(TimeSpan.FromSeconds(2));
}
}
}
线程优先级
原始数据 复制代码
using System;
using System.Diagnostics;
using System.Threading;
namespace MulityThreadNote
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine($"Current thread priority: {Thread.CurrentThread.Priority}");
Console.WriteLine("Running on all cores available");//获取实例线程状态
RunThreads();
Thread.Sleep(TimeSpan.FromSeconds(2));
Console.WriteLine("Running on a single Core");
//让操作系统的所有线程运行在单个CPU核心上
Process.GetCurrentProcess().ProcessorAffinity = new IntPtr(1);
RunThreads();
Console.ReadLine();
}
private static void RunThreads()
{
var sample = new ThreadSample();
var t1 = new Thread(sample.CountNumbers);
t1.Name = "Thread One";
var t2 = new Thread(sample.CountNumbers);
t2.Name = "Thread Two";
t1.Priority = ThreadPriority.Highest;//使用Priority设置线程的优先级
t2.Priority = ThreadPriority.Lowest;
t1.Start();
t2.Start();
Thread.Sleep(TimeSpan.FromSeconds(2));
sample.Stop();
}
}
class ThreadSample
{
private bool _isStopped = false;
public void Stop()
{
_isStopped = true;
}
public void CountNumbers()
{
long counter = 0;
while (!_isStopped)
{
counter++;
}
Console.WriteLine($"{Thread.CurrentThread.Name} with {Thread.CurrentThread.Priority} priority has a count={counter.ToString("N0")}");
}
}
}
前后台线程
原始数据 复制代码
using System;
using System.Diagnostics;
using System.Threading;
namespace MulityThreadNote
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine($"Current thread priority: {Thread.CurrentThread.Priority}");
Console.WriteLine("Running on all cores available");//获取实例线程状态
RunThreads();
Thread.Sleep(TimeSpan.FromSeconds(2));
Console.WriteLine("Running on a single Core");
//让操作系统的所有线程运行在单个CPU核心上
Process.GetCurrentProcess().ProcessorAffinity = new IntPtr(1);
RunThreads();
Console.ReadLine();
}
private static void RunThreads()
{
var sample = new ThreadSample();
var t1 = new Thread(sample.CountNumbers);
t1.Name = "Thread One";
var t2 = new Thread(sample.CountNumbers);
t2.Name = "Thread Two";
t1.Priority = ThreadPriority.Highest;//使用Priority设置线程的优先级
t2.Priority = ThreadPriority.Lowest;
t1.Start();
t2.Start();
Thread.Sleep(TimeSpan.FromSeconds(2));
sample.Stop();
}
}
class ThreadSample
{
private bool _isStopped = false;
public void Stop()
{
_isStopped = true;
}
public void CountNumbers()
{
long counter = 0;
while (!_isStopped)
{
counter++;
}
Console.WriteLine($"{Thread.CurrentThread.Name} with {Thread.CurrentThread.Priority} priority has a count={counter.ToString("N0")}");
}
}
}
向线程传递参数
原始数据 复制代码
using System;
using System.Diagnostics;
using System.Threading;
namespace MulityThreadNote
{
class Program
{
static void Main(string[] args)
{
ThreadSample sample = new ThreadSample(5);
Thread t1 = new Thread(sample.CountNumbers);
t1.Name = "ThreadOne";
t1.Start();
t1.Join();
Console.WriteLine("--------------------------");
Thread t2 = new Thread(Count);
t2.Name = "ThreadTwo";
t2.Start(3);
t2.Join();
Console.WriteLine("--------------------------");
//使用lambda表达式引用另一个C#对方的方式被称为闭包。当在lambda表达式中使用任何局部变量时,C#会生成一个类,并将该变量作为该类的一个属性,但是我们无须定义该类,C#编译器会自动帮我们实现
Thread t3 = new Thread(()=> CountNumbers(5));
t3.Name = "ThreadThree";
t3.Start();
t3.Join();
Console.WriteLine("--------------------------");
int i = 10;
Thread t4 = new Thread(() => PrintNumber(i));
i = 20;
Thread t5 = new Thread(() => PrintNumber(i));
t4.Start();
t5.Start();
//t4, t5都会输出20, 因为t4,t5没有Start之前i已经变成20了
Console.ReadKey();
}
static void Count(object iterations)
{
CountNumbers((int)iterations);
}
static void CountNumbers(int iterations)
{
for (int i = 1; i <= iterations; i++)
{
Thread.Sleep(TimeSpan.FromSeconds(0.5));
Console.WriteLine($"{Thread.CurrentThread.Name} prints {i}");
}
}
static void PrintNumber(int number)
{
Console.WriteLine(number);
}
}
class ThreadSample
{
private readonly int _iteration;
public ThreadSample(int iteration)
{
_iteration = iteration;
}
public void CountNumbers()
{
for (int i = 1; i <= _iteration; i++)
{
Thread.Sleep(TimeSpan.FromSeconds(0.5));
Console.WriteLine($"{Thread.CurrentThread.Name} prints {i}");
}
}
}
}
lock 关键字
原始数据 复制代码
using System;
using System.Diagnostics;
using System.Threading;
namespace MulityThreadNote
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Incorrect Counter");
Counter c1 = new Counter();
var t1 = new Thread(() => TestCounter(c1));
var t2 = new Thread(() => TestCounter(c1));
var t3 = new Thread(() => TestCounter(c1));
t1.Start();
t2.Start();
t3.Start();
t1.Join();
t2.Join();
t3.Join();
Console.WriteLine($"Total Count: {c1.Count}");
Console.WriteLine("------------------------");
Console.WriteLine("Correct counter");
CounterWithLock c2 = new CounterWithLock();
t1 = new Thread(() => TestCounter(c2));
t2 = new Thread(() => TestCounter(c2));
t3 = new Thread(() => TestCounter(c2));
t1.Start();
t2.Start();
t3.Start();
t1.Join();
t2.Join();
t3.Join();
Console.WriteLine($"Total count:{c2.Count}");
Console.ReadLine();
}
static void TestCounter(CounterBase c)
{
for (int i = 0; i < 100000; i++)
{
c.Increment();
c.Decrement();
}
}
class Counter : CounterBase
{
public int Count { get; private set; }
public override void Decrement()
{
Count--;
}
public override void Increment()
{
Count++;
}
}
class CounterWithLock : CounterBase
{
private readonly object _asyncRoot = new object();
public int Count { get; private set; }
public override void Decrement()
{
lock (_asyncRoot)
{
Count--;
}
}
public override void Increment()
{
lock (_asyncRoot)
{
Count++;
}
}
}
abstract class CounterBase
{
public abstract void Increment();
public abstract void Decrement();
}
}
class ThreadSample
{
private readonly int _iteration;
public ThreadSample(int iteration)
{
_iteration = iteration;
}
public void CountNumbers()
{
for (int i = 1; i <= _iteration; i++)
{
Thread.Sleep(TimeSpan.FromSeconds(0.5));
Console.WriteLine($"{Thread.CurrentThread.Name} prints {i}");
}
}
}
}
monitor类锁定资源
原始数据 复制代码
using System;
using System.Diagnostics;
using System.Threading;
namespace MulityThreadNote
{
class Program
{
static void Main(string[] args)
{
object lock1 = new object();
object lock2 = new object();
new Thread(() => LockTooMuch(lock1, lock2)).Start();
lock (lock2)
{
Thread.Sleep(1000);
Console.WriteLine("Monitor.TryEnter allows not to get stuck, returning false after a specified timeout is elapsed");
//直接使用Monitor.TryEnter, 如果在第二个参数之前还未获取到lock保护的资源会返回false
if (Monitor.TryEnter(lock1, TimeSpan.FromSeconds(5)))
{
Console.WriteLine("Acquired a protected resource successfully");
}
else
{
Console.WriteLine("Timeout acquiring a resource");
}
}
new Thread(() => LockTooMuch(lock1, lock2)).Start();
Console.WriteLine("-----------------------------");
/* 下面代码会造成死锁, 所以注释掉
lock (lock2)
{
Console.WriteLine("This will be a deadlock!");
Thread.Sleep(1000);
lock (lock1)
{
Console.WriteLine("Acquired a protected resource successfully");
}
}
*/
}
static void LockTooMuch(object lock1, object lock2)
{
lock (lock1)
{
Thread.Sleep(1000);
lock (lock2);
}
}
}
}
异常处理
原始数据 复制代码
using System;
using System.Diagnostics;
using System.Threading;
namespace MulityThreadNote
{
class Program
{
static void Main(string[] args)
{
Thread t = new Thread(FaultyThread);
t.Start();
t.Join();
try
{
t = new Thread(BadFaultyThread);
t.Start();
}
catch (Exception ex)
{
Console.WriteLine("We won't get here");
}
}
static void BadFaultyThread()
{
Console.WriteLine("Starting a faulty thread.....");
Thread.Sleep(TimeSpan.FromSeconds(2));
//这个异常主线程无法捕捉到,因为是在子线程抛出的异常。需要在子线程中加入try...catch捕获异常
throw new Exception("Boom!");
}
static void FaultyThread()
{
try
{
Console.WriteLine("Starting a faulty thread...");
Thread.Sleep(TimeSpan.FromSeconds(1));
throw new Exception("Boom");
}
catch (Exception ex)
{
Console.WriteLine($"Exception handled: {ex.Message}");
}
}
}
}

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