在 C# 中连接线程
原文:https://www.geeksforgeeks.org/joining-threads-in-c-sharp/
在 C# 中，Thread 类提供了 Join() 方法，该方法允许一个线程等待另一个线程完成其执行。如果 t 是其线程当前正在执行的线程对象，则 t.Join() 会导致当前线程暂停其执行，直到其加入的线程完成其执行。 如果有多个线程调用 join()方法，这意味着 Join 上的重载允许程序员指定等待时间。但是，与睡眠一样，join 依赖于操作系统的计时，因此您不应该假设 Join 会等待您指定的时间。
Thread.Join()方法重载列表中有 三个 方法如下:
-
Join() Method: This method blocks the calling thread until the thread represented by this instance terminates while continuing to perform standard COM and SendMessage pumping.
语法:
cs public void Join (); -
Join(Int32) Method: This method blocks the calling thread until the thread represented by this instance terminates or the specified time elapses while continuing to perform standard COM and SendMessage pumping.
语法:
cs public bool Join (int millisecondsTimeout); -
Join(TimeSpan) Method: This method blocks the calling thread until the thread represented by this instance terminates or the specified time elapses while continuing to perform standard COM and SendMessage pumping.
语法:
cs public bool Join (TimeSpan timeout);
例 1:
// C# program to illustrate the
// concept of Join() method
using System;
using System.Threading;
public class ExThread
{
// Non-Static method
public void mythread()
{
for (int x = 0; x < 4; x++)
{
Console.WriteLine(x);
Thread.Sleep(100);
}
}
// Non-Static method
public void mythread1()
{
Console.WriteLine("2nd thread is Working..");
}
}
// Driver Class
public class ThreadExample
{
// Main method
public static void Main()
{
// Creating instance for
// mythread() method
ExThread obj = new ExThread();
// Creating and initializing threads
Thread thr1 = new Thread(new ThreadStart(obj.mythread));
Thread thr2 = new Thread(new ThreadStart(obj.mythread1));
thr1.Start();
// Join thread
thr1.Join();
thr2.Start();
}
}
输出:
0
1
2
3
2nd thread is Working..
说明:在上面的例子中，我们有一个名为 ExThread 的类，这个类包含一个非静态的方法，即mythread()和mythread1()。所以我们创建一个实例，即 ExThread 类的 obj ，并在 ThreadStart 类的构造函数中引用它。使用Thread thr1 = new Thread(new ThreadStart(obj.mythread));语句，我们创建一个名为 thr1 的线程，并初始化该线程的工作，类似于线程 thr2 。使用thr1.Join();语句，我们将 thr2 的调用发送到等待中，直到 thr1 线程的工作完成。之后线程执行。
例 2:
// C# program to illustrate the
// concept of Join() method
using System;
using System.Threading;
class GFG {
// Creating TimeSpan for thread
static TimeSpan mytime = new TimeSpan(0, 0, 1);
// Main method
public static void Main()
{
// Creating and initializing new thread
Thread thr = new Thread(mywork);
thr.Start();
if (thr.Join(mytime + mytime)) {
Console.WriteLine("New thread is terminated");
}
else {
Console.WriteLine("Join timed out");
}
}
static void mywork()
{
Thread.Sleep(mytime);
}
}
输出:
New thread is terminated
参考:
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