问在Pythonnet中，BeginAllowThreads在从Python调用C#对象时崩溃。

EN

// In the main thread Pythonnet is initialised like this:
public void Initialise() 
{
    PythonEngine.Initialize();
    m_outerScope = Py.CreateScope( "outerscope" )
    ...
    m_mainThreadState = PythonEngine.BeginAllowThreads();
}

...
// A python script is run on a worker thread like this. 
// pyObj is a CLR object with methods the script can call, created 
// with clrobj.ToPython():
void runScript( string script, PyObject pyObj, string objName)
{
    using( Py.GIL() ) {
        using( PyScope scope = m_outerScope.NewScope() ) {
            try {
                scope.Set( objName, pyObj );
                scope.Exec( script );
            } catch( Exception exc ) {
                ...
            }
        }
    }
}
...
// Within the Python script we have something like:
objName.SomeMethod( 'message')
...

// The callback method on the CLR object looks like:
public void SomeMethod( string msg )
{
    var state = PythonEngine.BeginAllowThreads();
    someLongRunningFunction( msg );
    PythonEngine.EndAllowThreads( state );
}