Hello,
Our app runs properly when run directly on an iPod Touch, but it crashes when I
run it in the MonoDevelop debugger. I've tracked it down to starting a thread
by calling System.Threading.Thread.Start(). The new thread just has a
Debug.WriteLine() in it. With the Thread.Start() call active, the app crashes
in the debugger; with the Thread.Start() commented out, the app runs in the
debugger. Specifically, in the AppDelegate::FinishedLaunching() routine, I am
creating a thread and calling Start() on it:
public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
initThread = new System.Threading.Thread(Initialize);
initThread.IsBackground = true;
initThread.Start();
}
private void Initialize()
{
Debug.WriteLine("testing");
}
If instead I use BeginInvokeOnMainThread(Initialize), the Initialize routine
(the real version, not just the Debug.WriteLine() version) will run but then a
subsequent thread create and Start() causes the same crash.
The crash report (from Xcode-Organizer, below) says that the exception type is
EXC_BAD_ACCESS / KERN_PROTECTION_FAILURE. I also get a nearly identical crash
if I set a breakpoint on any line of C# code in the case where the code does
run.
Other possibly relevant information:
1. MonoDevelop v2.6.0.1, Mono v2.10.5, MonoTouch v4.0.7
2. I've written a HelloWorld app that similarly creates a Thread and calls
Thread.Start() on it. It runs as expected and I see the Debug.WriteLine output.
I can also set Breakpoints and step through code. I doubt the issue is with the
actual thread or threading mechanism; it just seems like a trigger or we're
reaching some threshold (perhaps memory?).
3. Our app is large. The core part of our app is a large C++ DLL, and we use C#
for the UI and non-core support functionality. Right now the amount of C# code
is small but growing as we continue to port our existing Windows/WinCE app. Are
there issues with having a large application? Right now, the app is 29.5MB for
Debug and about 14MB for Release.
Has anyone seen similar behaviour? Does anyone have ideas or things to try?
Thanks,
Conway
Crash Log:
---------------------------------------------------------------
Exception Type: EXC_BAD_ACCESS (SIGSYS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x01cfc000
Crashed Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 Main 0x00dd0a5c process_single_step
(debugger-agent.c:3993)
1 ??? 0x01cfbff8 0 + 30392312
2 Main 0x008ed92c
wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr
+ 192
3 Main 0x00da9412 mono_jit_runtime_invoke
(mini.c:5754)
4 Main 0x00e53d5a mono_runtime_invoke
(object.c:2756)
5 Main 0x00ebfcac monotouch_trampoline
(monotouch-glue.m:652)
6 UIKit 0x30a1781a -[UIApplication
_callInitializationDelegatesForURL:payload:suspended:] + 766
7 UIKit 0x30a11b5e -[UIApplication
_runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 266
8 UIKit 0x309e67d0 -[UIApplication
handleEvent:withNewEvent:] + 1108
9 UIKit 0x309e620e -[UIApplication sendEvent:] + 38
10 UIKit 0x309e5c4c _UIApplicationHandleEvent + 5084
11 GraphicsServices 0x30269e70 PurpleEventCallback + 660
12 CoreFoundation 0x30957a90
__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 20
13 CoreFoundation 0x30959838 __CFRunLoopDoSource1 + 160
14 CoreFoundation 0x3095a606 __CFRunLoopRun + 514
15 CoreFoundation 0x308eaebc CFRunLoopRunSpecific + 224
16 CoreFoundation 0x308eadc4 CFRunLoopRunInMode + 52
17 UIKit 0x30a10d42 -[UIApplication _run] + 366
18 UIKit 0x30a0e800 UIApplicationMain + 664
19 Main 0x0063da8c
wrapper_managed_to_native_MonoTouch_UIKit_UIApplication_UIApplicationMain_int_string___intptr_intptr
+ 232
20 Main 0x0068a4c4 methods + 75556
21 Main 0x008ed92c
wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr
+ 192
22 Main 0x00da9412 mono_jit_runtime_invoke
(mini.c:5754)
23 Main 0x00e53d5a mono_runtime_invoke
(object.c:2756)
24 Main 0x00e55be4 mono_runtime_exec_main
(object.c:3939)
25 Main 0x00e55214 mono_runtime_run_main
(object.c:3561)
26 Main 0x00db0bac mono_jit_exec (driver.c:1102)
27 Main 0x00da2f9e main (main.m:2110)
28 Main 0x005caba0 start + 32
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