---- Reported by zealy@freemail.hu 2004-02-04 16:49:06 MST ----

Description of Problem:
The followings apply both to mono 0.30 built from source and the official 
debian package mono 0.29.999. 
When using libmono to call methods of .NET classes from within C, on the 
first attempt to use globalisation (using the type System.String in my 
case), an exception NullReferenceException is thrown in 
System.Globalization.CultureInfo. (See the section Actual output below for 
details).
The "equivalent" C# code works as expected.

Steps to reproduce the problem:
1. Compile the following C code
#include <glib.h>
#include <mono/jit/jit.h>
#include <mono/metadata/object.h>
#include <mono/metadata/debug-helpers.h>
#include <mono/metadata/appdomain.h>

extern void *mono_jit_trace_calls;

int main(int argc, char **argv)
{
  gchar* str = "What bug?";
  gpointer params[1];

  MonoDomain *domain = NULL;
  domain = mono_jit_init ("gotbug");

  MonoAssembly *assembly = NULL;
  assembly = mono_domain_assembly_open (domain, "/usr/lib/mscorlib.dll");

// uncomment to enable tracing
//  mono_jit_trace_calls=mono_trace_parse_options(assembly, "");
// 

  MonoClass *class;
  class = (MonoClass*) mono_class_from_name (assembly-
>image, "System", "Console");
  mono_class_init (class);

  static MonoMethod *method;
  MonoMethodDesc *desc = mono_method_desc_new (":WriteLine(string)", 
FALSE);
  method = mono_method_desc_search_in_class (desc, class);

  params[0] = (gpointer*) mono_string_new (domain, str);

  mono_runtime_invoke (method, NULL, params, NULL);
  return 0;
}


2. Compile the following .cs code
using System;

public class GotBug
{
    static int Main(string[] args)
    {
	Console.WriteLine("What bug?");
	return 0;
    }
}



3. Compare the outputs of the above programs

Actual Results:

Unhandled Exception: System.TypeInitializationException: An exception was 
thrown by the type initializer for System.Console ---> 
System.NullReferenceException: A null value was found where an object 
instance was required
in <0x0000f> System.Globalization.CultureInfo:get_CurrentCulture ()
in <0x00010> System.String:ToUpper ()
in <0x0003f> System.Console:.cctor ()
--- End of inner exception stack trace ---

Expected Results:
"What bug?" echoed on the tty

How often does this happen? 
Always

Additional Information:



---- Additional Comments From vargaz@freemail.hu 2004-02-05 07:02:57 MST ----

You need to call mono_thread_attach (domain) before calling 
mono_runtime_invoke so the runtime can create its per-thread data
structures.




---- Additional Comments From vargaz@freemail.hu 2004-02-05 07:04:11 MST ----

*** https://bugzilla.novell.com/show_bug.cgi?id=MONO52375 has been marked as a duplicate of this bug. ***



---- Additional Comments From zealy@freemail.hu 2004-02-05 10:06:18 MST ----

And the documentation mentions it so, but I quite missed that it 
applies to me as well, having no threads created by me but having 
threads created by the system quietly :)

(The documentation my make good use of some revising anyway)


Unknown bug field "cf_op_sys_details" encountered while moving bug
   <cf_op_sys_details>dist-upgraded to sid</cf_op_sys_details>