Weird and rather worrying. I cannot explain this stacktrace at all as the
UserLog class is thread safe as far as I can see and in fact has been in
production across multiple platforms for years.
Sorry, I don't have the actual exception message, there did not appear to be
one in the logcat output.
It looks to me like the string got trashed in some way. At first I thought
it might be a problem with locking on static variables, so I knocked up a
sample app with 50 threads sleeping randomly and writing to UserLog class,
but I couldn't replicate the crash...
Deployed on a Motorola Xoom, built in release mode, built with both armeabi
and armeab-v7a selected for supported architectures.
Only slightly nonstandard thing I can think of is that UserLog is in a
library dll which is built with a minimum target platform version of 1.6
whereas the app was built to target 2.2.
Any ideas anyone?
Cheers
Iain
I/mono ( 1743): Stacktrace:
I/mono ( 1743):
I/mono ( 1743): at string.Remove (int,int) <0x0003f>
I/mono ( 1743): at *****.UserLog.ClipLogText () <0x00053>
I/mono ( 1743): at *****.UserLog.WriteLine (string) <0x00163>
I/mono ( 1743): at *****.ControlPoint.Upnp.DeviceListUpnp.Rescan ()
<0x00123>
I/mono ( 1743): at *****.Library.Rescan () <0x00023>
I/mono ( 1743): at *****.Stack.<InitialiseStack>b__1
(object,System.Timers.ElapsedEventArgs) <0x0007f>
I/mono ( 1743): at System.Timers.Timer.Callback (object) <0x00423>
I/mono ( 1743): at System.Threading.Timer/Scheduler.TimerCB (object)
<0x0019f>
I/mono ( 1743): at (wrapper runtime-invoke)
<Module>.runtime_invoke_void__this___object (object,intptr,intptr,intpt
r) <0xffffffff>
public class UserLog
{
public static void Write(string aMessage)
{
lock (iLock)
{
foreach (IUserLogListener listener in iListenerList)
{
try
{
listener.Write(aMessage);
}
catch (Exception) { }
}
iLogText += aMessage;
ClipLogText();
}
}
public static void WriteLine(string aMessage)
{
lock (iLock)
{
foreach (IUserLogListener listener in iListenerList)
{
try
{
listener.WriteLine(aMessage);
}
catch (Exception) { }
}
iLogText += aMessage + Environment.NewLine;
ClipLogText();
}
}
public static void AddListener(IUserLogListener aListener)
{
lock (iLock)
{
iListenerList.Add(aListener);
}
}
public static void RemoveListener(IUserLogListener aListener)
{
lock (iLock)
{
iListenerList.Remove(aListener);
}
}
public static string Text
{
get
{
lock (iLock)
{
return iLogText;
}
}
}
private static void ClipLogText()
{
if (iLogText.Length >= kMaxTextLength)
{
iLogText = iLogText.Remove(0, iLogText.Length -
kMaxTextLength);
}
}
private static readonly int kMaxTextLength = 32767;
private static string iLogText = "";
private static object iLock = new object();
private static List<IUserLogListener> iListenerList = new
List<IUserLogListener>();
}
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