Hallo,
Das folgende Console-Program läuft als Release und AnyCPU kompiliert unter x64 in einer Endlosschleife wenn man es ohne Debugger startet. Mit Debugger oder auf x86 läuft es einwandfrei. Es scheint als ob der Runtime-Optimizer von x64 einen Bug
hat. Das Probem ist mit .NET 2.0 und .NET 4.0 nachstellbar.
Program flow:
·
locale variable switchNextUrl in Test() will be initialized with false
·
before calling the function Login(), the variable will be set to true (will be written in the console output)
·
the function Login throws a socket exception
·
after executing the exception handler for SocketException, the variable is false! The only place
where the code set the variable back to false is the BusyException handle, which will not be executed!
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Net;
using System.Threading;
namespace TestLoop
{
class Program
{
static void Main(string[] args)
{
try
{
new Program().Test();
}
catch (Exception e)
{
Console.WriteLine("Function fails: {0}", e);
}
Console.WriteLine("Finished");
Console.WriteLine("Press enter to exit");
Console.ReadLine();
}
void Test()
{
try
{
Console.WriteLine("(c) Michael Geramb");
bool switchNextUrl = false;
// Loop through all urls, if one fails
int urlIndex = 1;
while (urlIndex <= 2)
{
Console.WriteLine("Try index {0}", urlIndex);
try
{
switchNextUrl =
true;
Console.WriteLine("switchNextUrl={0} (before Login)", switchNextUrl);
Login();
// throws socket exception
return;
}
catch (SocketException exception)
{
Console.WriteLine("SocketException: {0}", exception.Message);
}
catch (BusyException exception)
{
Console.WriteLine("OpwsException {0}", exception.Message);
Console.WriteLine("set
switchNextUrl to false");
switchNextUrl =
false; // Try again same url
}
Console.WriteLine("switchNextUrl={0} (before check)", switchNextUrl);
if (switchNextUrl)
{
urlIndex++;
}
}
throw new
Exception("Error");
}
catch (Exception e)
{
Console.WriteLine("Execute fails: {0}", e);
throw;
}
}
void Login()
{
Thread.Sleep(500);
throw new
SocketException((int)SocketError.HostNotFound);
}
class BusyException :
Exception
{
}
}
}
Grüße,
michi!
