1. Jian, can you convert your code to simplified interface using Py.GIL() calls? If not possible, please let us know why. https://github.com/pythonnet/pythonnet/blob/master/README.md 2. Your first code sample (unit test) is self-contained, but in second code sample (UI) it is not clear where you acquire and release the GIL? 3. Finally can you post this as an issue on github? https://github.com/pythonnet/pythonnet/issues/new Thanks, Denis On Thu, Jul 28, 2016 at 8:51 AM, Jian Wang <wjchicago@gmail.com> wrote:

Dear PythonNet group,

I am working on a c# project which would like to access functions written in python from time to time. Below is a wrapper function.

I have a unittest setup for this function. Everytime I run this unittest, it will get information from python world as I desired.

public ScriptContext GetContextFromScript() { ScriptContext scriptContext; try { if (!PythonEngine.IsInitialized) PythonEngine.Initialize(); var threadState = PythonEngine.BeginAllowThreads(); var gilState = PythonEngine.AcquireLock();

PyObject mod = PythonEngine.ImportModule(this.GetModuleName()); PyObject instance = mod.InvokeMethod("Strategy", new PyTuple()); scriptContext =(ScriptContext)instance.InvokeMethod("SetContext", new PyTuple()).AsManagedObject(typeof (ScriptContext));

PythonEngine.ReleaseLock(gilState); PythonEngine.EndAllowThreads(threadState); PythonEngine.Shutdown(); } catch (Exception ex) { throw; } return scriptContext; }

However, when I launch the UI and call this function by clicking some button, the program hangs at PythonEngine.Initialize().

After debugging into the PythonNet source code, I found when calling through UI, the RunTime.Initialize() will return true for Runtime.Py_IsInitialized().

internal static void Initialize() { is32bit = IntPtr.Size == 4;

if (0 == Runtime.Py_IsInitialized()) { Runtime.Py_Initialize(); }

if (0 == Runtime.PyEval_ThreadsInitialized()) { Runtime.PyEval_InitThreads(); } }

And the whole initialize process will hang when result.Dispose() is called. It actually trying to acquire lock but cannot get it.

using (StreamReader reader = new StreamReader(stream)) { // add the contents of clr.py to the module string clr_py = reader.ReadToEnd(); PyObject result = RunString(clr_py, module_globals, locals.Handle); if (null == result) throw new PythonException(); result.Dispose(); }

It looks like something happend before code reaching this pythong wrapper function. PythonEninge is partially initialized with Runtime.Py_IsInitialized() = true and Runtime.PyEval_ThreadsInitialized() = false.

Questions 1. what could be the possible cause for this situation? 2. If I cannot find the root cause and put BegineAllowThreads() there, what could be a solution for it?

Many thanks!

Jian

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