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Fix Re-initialization by filmor · Pull Request #343 · pythonnet/pythonnet · GitHub

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Fix Re-initialization #343

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Merged
vmuriart merged 2 commits into from
Jan 31, 2017
Conversation 14 Commits 2 Checks 0 Files changed
Merged

Fix Re-initialization #343

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9912712
Make RunString safer and more standard.
filmor Jan 26, 2017
af6d37f
Fix the shutdown issue by keeping PyMethodDef.
filmor Jan 26, 2017
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24 changes: 11 additions & 13 deletions src/runtime/importhook.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,13 @@ internal class ImportHook

#if PYTHON3
static IntPtr py_clr_module;
static IntPtr module_def;
static IntPtr module_def = IntPtr.Zero;

internal static void InitializeModuleDef()
{
if (module_def == IntPtr.Zero)
module_def = ModuleDefOffset.AllocModuleDef("clr");
}
#endif

//===================================================================
Expand Down Expand Up @@ -44,8 +50,8 @@ internal static void Initialize()
root = new CLRModule();

#if PYTHON3
// create a python module with the same methods as the clr module-like object
module_def = ModuleDefOffset.AllocModuleDef("clr");
// create a python module with the same methods as the clr module-like object
InitializeModuleDef();
py_clr_module = Runtime.PyModule_Create2(module_def, 3);

// both dicts are borrowed references
Expand All @@ -70,21 +76,13 @@ internal static void Initialize()

internal static void Shutdown()
{
#if PYTHON3
if (0 != Runtime.Py_IsInitialized()) {
#if PYTHON3
Runtime.XDecref(py_clr_module);
Runtime.XDecref(root.pyHandle);
}
ModuleDefOffset.FreeModuleDef(module_def);
#elif PYTHON2
if (0 != Runtime.Py_IsInitialized())
{
Runtime.XDecref(root.pyHandle);
Runtime.XDecref(root.pyHandle);
}
#endif
if (0 != Runtime.Py_IsInitialized())
{
Runtime.XDecref(root.pyHandle);
Runtime.XDecref(py_import);
}
}
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2 changes: 1 addition & 1 deletion src/runtime/interop.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -227,7 +227,7 @@ public static IntPtr AllocModuleDef(string modulename) {
byte[] ascii = Encoding.ASCII.GetBytes(modulename);
int size = name + ascii.Length + 1;
IntPtr ptr = Marshal.AllocHGlobal(size);
for (int i = 0; i <= m_free; i += IntPtr.Size)
for (int i = 0; i < m_free; i += IntPtr.Size)
Marshal.WriteIntPtr(ptr, i, IntPtr.Zero);
Marshal.Copy(ascii, 0, (IntPtr)(ptr + name), ascii.Length);
Marshal.WriteIntPtr(ptr, m_name, (IntPtr)(ptr + name));
Expand Down
59 changes: 40 additions & 19 deletions src/runtime/pythonengine.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -411,33 +411,54 @@ public static PyObject ModuleFromString(string name, string code)
/// executing the code string as a PyObject instance, or null if
/// an exception was raised.
/// </remarks>
public static PyObject RunString(string code)
public static PyObject RunString(
string code, IntPtr? globals = null, IntPtr? locals = null
)
{
IntPtr globals = Runtime.PyEval_GetGlobals();
IntPtr locals = Runtime.PyDict_New();

IntPtr builtins = Runtime.PyEval_GetBuiltins();
Runtime.PyDict_SetItemString(locals, "__builtins__", builtins);
bool borrowedGlobals = true;
if (globals == null)
{
globals = Runtime.PyEval_GetGlobals();
if (globals == IntPtr.Zero)
{
globals = Runtime.PyDict_New();
Runtime.PyDict_SetItemString(
globals.Value, "__builtins__",
Runtime.PyEval_GetBuiltins()
);
borrowedGlobals = false;
}
}

IntPtr flag = (IntPtr)257; /* Py_file_input */
IntPtr result = Runtime.PyRun_String(code, flag, globals, locals);
Runtime.XDecref(locals);
if (result == IntPtr.Zero)
bool borrowedLocals = true;
if (locals == null)
{
return null;
locals = Runtime.PyDict_New();
borrowedLocals = false;
}
return new PyObject(result);
}

public static PyObject RunString(string code, IntPtr globals, IntPtr locals)
{
IntPtr flag = (IntPtr)257; /* Py_file_input */
IntPtr result = Runtime.PyRun_String(code, flag, globals, locals);
if (result == IntPtr.Zero)

try
{
return null;
IntPtr result = Runtime.PyRun_String(
code, flag, globals.Value, locals.Value
);

if (Runtime.PyErr_Occurred() != 0)
{
throw new PythonException();
}

return new PyObject(result);

vmuriart Jan 31, 2017

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

The return within the try statement can get tricky.
http://stackoverflow.com/questions/3216046/does-the-c-sharp-finally-block-always-execute

filmor Jan 31, 2017

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

I don't really see the issue here.

filmor Jan 31, 2017

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

To elaborate, the link that you posted warns against relying on try {} finally {} as the finally may not be executed, but in such a case the problem has either exited already or is in the process of doing so, so we don't have to worry about dereferencing the Python resources anyhow.

vmuriart Jan 31, 2017

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

It was more of a caveat, return statements within try statements confuse me at times.
}
finally
{
if (!borrowedLocals)
Runtime.XDecref(locals.Value);
if (!borrowedGlobals)
Runtime.XDecref(globals.Value);
}
return new PyObject(result);
}
}

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