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  1. using System;
  2. using System.Threading;
  3. using System.Runtime.InteropServices;
  4.  
  5. static class Program
  6. {
  7.     [DllImport("libc.so.6")]
  8.     private static extern int sched_getcpu();
  9.  
  10.     [DllImport("libc.so.6", SetLastError = true)]
  11.     private static extern int sched_setaffinity(int pid, IntPtr cpusetsize, ulong[] cpuset);
  12.  
  13.     private static void SetAffinity(int processorID)
  14.     {
  15.         ulong processorMask = 1UL << processorID;
  16.         sched_setaffinity(0, new IntPtr(sizeof(ulong)), new[] { processorMask });
  17.     }
  18.  
  19.     static void Main(string[] args)
  20.     {
  21.         int processorCount = Environment.ProcessorCount;
  22.         Console.WriteLine("Processor count: " + processorCount);                
  23.         Random random = new Random();
  24.         Thread[] threads = new Thread[100];
  25.  
  26.         for (int i = 0; i < 100; i++)
  27.         {
  28.             int target = random.Next(0, processorCount);
  29.  
  30.             threads[i] = new Thread(new ThreadStart(() =>
  31.             {
  32.                 Thread.BeginThreadAffinity();
  33.                 try
  34.                 {
  35.                     SetAffinity(target);
  36.                     int actual = sched_getcpu();
  37.                     if (actual == target)
  38.                         Console.WriteLine("* Running correctly on " + actual);
  39.                     else
  40.                         Console.WriteLine("* Running on " + actual + "; should be on " + target);
  41.                 }
  42.                 finally
  43.                 {
  44.                     Thread.EndThreadAffinity();
  45.                 }
  46.             }));
  47.  
  48.             threads[i].Start();
  49.         }
  50.  
  51.         for (int i = 0; i < 100; i++)
  52.             threads[i].Join();
  53.     }
  54. }
  55.  
Success #stdin #stdout 0.05s 45440KB
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stdin
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stdout
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Processor count: 4
* Running correctly on 2
* Running correctly on 2
* Running correctly on 2
* Running correctly on 1
* Running correctly on 0
* Running correctly on 2
* Running correctly on 3
* Running correctly on 1
* Running correctly on 1
* Running correctly on 3
* Running correctly on 1
* Running correctly on 3
* Running correctly on 0
* Running correctly on 1
* Running correctly on 0
* Running correctly on 2
* Running correctly on 2
* Running correctly on 0
* Running correctly on 0
* Running correctly on 2
* Running correctly on 2
* Running correctly on 3
* Running correctly on 1
* Running correctly on 2
* Running correctly on 1
* Running correctly on 2
* Running correctly on 2
* Running correctly on 3
* Running correctly on 0
* Running correctly on 2
* Running correctly on 0
* Running correctly on 3
* Running correctly on 0
* Running correctly on 2
* Running correctly on 3
* Running correctly on 1
* Running correctly on 1
* Running correctly on 2
* Running correctly on 2
* Running correctly on 0
* Running correctly on 1
* Running correctly on 0
* Running correctly on 2
* Running correctly on 3
* Running correctly on 2
* Running correctly on 0
* Running correctly on 2
* Running correctly on 1
* Running correctly on 3
* Running correctly on 0
* Running correctly on 0
* Running correctly on 2
* Running correctly on 3
* Running correctly on 3
* Running correctly on 2
* Running correctly on 3
* Running correctly on 1
* Running correctly on 0
* Running correctly on 1
* Running correctly on 0
* Running correctly on 0
* Running correctly on 0
* Running correctly on 2
* Running correctly on 1
* Running correctly on 1
* Running correctly on 1
* Running correctly on 1
* Running correctly on 1
* Running correctly on 2
* Running correctly on 3
* Running correctly on 3
* Running correctly on 1
* Running correctly on 0
* Running correctly on 0
* Running correctly on 2
* Running correctly on 0
* Running correctly on 0
* Running correctly on 2
* Running correctly on 3
* Running correctly on 1
* Running correctly on 1
* Running correctly on 2
* Running correctly on 1
* Running correctly on 3
* Running correctly on 2
* Running correctly on 3
* Running correctly on 0
* Running correctly on 2
* Running correctly on 0
* Running correctly on 1
* Running correctly on 0
* Running correctly on 0
* Running correctly on 3
* Running correctly on 2
* Running correctly on 0
* Running correctly on 0
* Running correctly on 3
* Running correctly on 1
* Running correctly on 0
* Running correctly on 1
https://ideone.com/oFxDRV
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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