C # Semaphore Usage Simple Example _c# tutorial

The example in this article describes the C # semaphore usage. Share to everyone for your reference, specific as follows:

Using System;
Using System.Collections.Generic;
Using System.Linq;
Using System.Text;
Using System.Threading;
 * * Title: How to use the Semaphore sample code * Author:kagula * date:2015-6-16 * environment:vs2010sp1,. NET Framework 4 Client Profile, C #.
 * Note:[1] "semaphore" can be considered as "authorization (card) pool".
 * One authorization (card) pool has 0 or more authorizations (certificates).
 * [2] The following sample SEM of semaphore is equivalent to a maximum of one authorization (certificate) pool. * [3] Every time the SEM is called.
 Release to add an authorization (certificate). * Connection calls multiple SEM.
 Release causes an exception to be thrown that exceeds the number of authorizations (certificates) that can be accommodated by the authorization pool. * [4] Every time the SEM is called.
 WaitOne Use an Authorization (certificate).
    * */namespace Kagula {class Mysemaphore {///first parameter, representing the current authorization count.
    0 indicates that there is no authorization (certificate).
    The second parameter, representing the semaphore instance, holds a maximum of several licenses.
    1 indicates a maximum authorized number of 1 times. exceeds the allowable number of authorizations, such as SEM.
    Release is called two consecutive times and throws an exception.
    public static semaphore sem = new semaphore (0, 1);
      public static void Main () {//Add one authorization. Release a SEM.
      Blocking of WaitOne (). Sem.
      Release ();
      Mythread mythrd1 = new Mythread ("Thrd #1");
      Mythread mythrd2 = new Mythread ("Thrd #2");
      Mythread mythrd3 = new Mythread ("Thrd #3"); Mythread MythrD4 = new Mythread ("Thrd #4");
      Mythrd1.thrd.Join ();
      Mythrd2.thrd.Join ();
      Mythrd3.thrd.Join ();
      Mythrd4.thrd.Join ();
      Input any key to continue ...
    Console.readkey ();
    }//end Main function}//end main class class Mythread {public Thread thrd;
      Public Mythread (string name) {thrd = new Thread (This.run); Thrd.
      name = name; Thrd.
    Start (); } void Run () {Console.WriteLine (THRD).
      Name + "is waiting for a license (card) ...");
      If you do not add a parameter, it can cause infinite wait. if (MySemaphore.sem.WaitOne (1000)) {Console.WriteLine (THRD).
        Name + "Apply to license (certificate) ...");
        Thread.Sleep (500);
        Although the license is added below, other threads may not have permission to exit the timeout. Console.WriteLine (THRD.
        Name + "Add a license (card) ...");
      MySemaphore.sem.Release (); else {Console.WriteLine (THRD).
      Name + "Timeout (waiting for a period of time or not getting a license) to exit ...");

 }}}//end class}//end namespace

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