[Mono-bugs] [Bug 605092] New: System.Timers.Timer.TimerComparer fails to compare arguments

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http://bugzilla.novell.com/show_bug.cgi?id=605092

http://bugzilla.novell.com/show_bug.cgi?id=605092#c0


           Summary: System.Timers.Timer.TimerComparer fails to compare
                    arguments
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.6.x
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: aenomoto at novell.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


This is a forwarded report from https://gist.github.com/21ab0a6c1015f96f9c19

Our System.Timers.Timer.TimerComparer (which is used by the scheduler) does not
look at instance differences and hence it may fail to compare instances.

Copying the repro from the link above:

using System;
using System.IO;
using System.Threading;
using System.Collections.Generic;

public class Test {
    private static Timer t1;
    private static Timer t2;
    private static Timer t3;
    public static void Main () {
        t1 = new Timer(Callback1, null, 0, 1000);
        t2 = new Timer(Callback2, null, 0, 1000);
        t3 = new Timer(Callback3, null, 0, 1000);
        Console.ReadLine();
    }

    private static void Callback1(Object o) { Console.Write('1'); }
    private static void Callback2(Object o) { Console.Write('2'); }
    private static void Callback3(Object o) { Console.Write('3'); }
}

ran on .net:
$ ./x.exe
213132132123132132132123132132132132

ran on mono:
$ mono ./x.exe
3333333333333333333333

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