"Writing high-quality Code C #" recommendation 72: Using semaphores in thread synchronization

1. Use the signaling mechanism to provide a simple example of thread synchronization

        AutoResetEvent AutoResetEvent = new AutoResetEvent (false);        private void Button1_Click (object sender, EventArgs e)        {            control.checkforillegalcrossthreadcalls = false;            Thread twork = new Thread (() =            {                Label1. Text = "Thread start ..." + Environment.NewLine;                Label1. Text + = "start to deal with some actual work" + Environment.NewLine;                Omit work code                Label1. Text + = "I began to wait for another thread to give me a signal before I was willing to go on" + Environment.NewLine;                Autoresetevent.waitone ();                Label1. Text + = "I'm going to do some work, and then it's over!" ";                Omit work Code            });            Twork.isbackground = true;            Twork.start ();        }        private void Button2_Click (object sender, EventArgs e)        {            //Set event status to signaled state, allowing one or more waiting threads to continue            AutoResetEvent.Set ();        }

In the above example, click on button 1 to execute to Autoresetevent.waitone () no longer down, click on the button 2 will continue to execute down.

The difference between 2.AutoResetEvent and ManualResetEvent:

Using Autoresetevent,autoresetevent.set () allows only one thread to continue, while Manualresetevent,manualresetevent.set () allows multiple threads to continue executing.

Examples are as follows:

　　　　  private void Button2_Click (object sender, EventArgs e) {//Set event status to signaled state, allowing one or more waiting threads to continue/            /autoresetevent.set ();         Manualresetevent.set (); private void Button3_Click (object sender, EventArgs e) {Control.checkforillegalcrossthreadcall            s = false;            StartThread1 ();        StartThread2 (); } private void StartThread1 () {Thread tWork1 = new Thread (() = {L Abel1.                Text = "Thread 1 start ..." + Environment.NewLine; Label1.                Text + = "start to deal with some actual work" + Environment.NewLine; Omit work code Label1.                Text + = "I began to wait for another thread to give me a signal before I was willing to go on" + Environment.NewLine;                Autoresetevent.waitone ();                Manualresetevent.waitone (); Label1. Text + = "I'm going to do some work, and then it's over!"                ";            Omit work code});            Twork1.isbackground = true;        Twork1.start (); } private void StartThread2() {Thread tWork2 = new Thread (() = {Label2.                Text = "Thread 2 start ..." + Environment.NewLine; Label2.                Text + = "start to deal with some actual work" + Environment.NewLine; Omit work code LABEL2.                Text + = "I began to wait for another thread to give me a signal before I was willing to go on" + Environment.NewLine;                Autoresetevent.waitone ();                Manualresetevent.waitone (); Label2. Text + = "I'm going to do some work, and then it's over!"                ";            Omit work code});            Twork2.isbackground = true;        Twork2.start (); }

3. Analog network communication

        private void Button4_Click (object sender, EventArgs e)        {            control.checkforillegalcrossthreadcalls = false;            Thread t = new Thread (() = {while                (true)                {
Principle: No 3 seconds to detect the reception, if not received a. Set (), the offline                    bool Re=a.waitone (+);                    if (re)                    {                        label3. Text = string. Format ("Time: {0},{1}", DateTime.Now.ToString (), "online");                    }                    else                    {                        label3. Text = string. Format ("Time: {0},{1}", DateTime.Now.ToString (), "Offline");}}                        );            T.isbackground = true;            T.start ();        }        private void Button5_click (object sender, EventArgs e)        {            a.set ();        }

　　

"Writing high-quality Code C #" recommendation 72: Using semaphores in thread synchronization