Open fadyosman opened 1 week ago
The plan to solve the bug involves ensuring that the C++ kernel is correctly configured and compatible with VS Code. The issue seems to stem from a combination of environment configuration problems, subprocess management issues, and potential compatibility gaps between the Jupyter extension in VS Code and the jupyter-cpp-kernel
. The solution will involve verifying the installation and configuration of the kernel, improving subprocess management, and ensuring compatibility with VS Code.
The bug is likely caused by a combination of factors:
Environment Configuration: The jupyter-cpp-kernel
might not be installed in the Python environment that VS Code is using, leading to issues when attempting to invoke the kernel.
Subprocess Management: The RealTimeSubprocess
class might not be handling the output streams correctly, leading to deadlocks or race conditions that prevent output from being displayed.
File Management: Temporary files used for compiling and executing C++ code might not be managed correctly, leading to execution failures.
VS Code Compatibility: There might be specific configurations or extensions required for the kernel to work with VS Code that are not currently set up.
Error Handling: Lack of informative error messages might make it difficult to diagnose and resolve issues when the kernel fails to execute code.
Here are some implementation details and code snippets to address the issues:
Verify Kernel Installation:
Ensure that the jupyter-cpp-kernel
is installed in the correct Python environment. You can do this by running:
pip install jupyter-cpp-kernel
Improve Subprocess Management:
Modify the RealTimeSubprocess
class to ensure proper handling of output streams. For example, ensure that threads are correctly managed and that there are no deadlocks:
class RealTimeSubprocess(subprocess.Popen):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.stdout_thread = threading.Thread(target=self._read_stdout)
self.stderr_thread = threading.Thread(target=self._read_stderr)
self.stdout_thread.start()
self.stderr_thread.start()
def _read_stdout(self):
for line in iter(self.stdout.readline, b''):
# Process stdout line
pass
def _read_stderr(self):
for line in iter(self.stderr.readline, b''):
# Process stderr line
pass
Ensure File Management: Verify that temporary files are created and deleted correctly, and handle any permission issues:
with tempfile.NamedTemporaryFile(delete=False) as source_file:
source_file.write(code.encode('utf-8'))
Check VS Code Compatibility:
Ensure that the kernel.json
file is correctly configured and that the Jupyter extension in VS Code is up-to-date.
Improve Error Handling:
Add more informative error messages in the do_execute
method to help diagnose issues:
def do_execute(self, code, silent, store_history=True, user_expressions=None, allow_stdin=False):
try:
# Compile and execute code
pass
except Exception as e:
self._write_to_stderr(f"Error executing code: {str(e)}")
To replicate the bug, follow these steps:
By addressing the identified issues, the kernel should work correctly with VS Code, and the bug should be resolved.
Click here to create a Pull Request with the proposed solution
Files used for this task:
Describe the bug When using the kernel in notebook, it works without any issues, however, inside VS Code there's no output when clicking the run button.
To Reproduce Steps to reproduce the behavior:
- Install VS Code, install the jupyter plugin.
- Create a notebook and choose the C++ kernel.
- Run the block, nothing happens.
Expected behavior The code should run and display the output, it used to work with the past versions.
Desktop (please complete the following information):
- OS: Tested both on Ubuntu 22.04 and macOS.
Additional context Clicking the run button many times, eventually causes the OS to hang.
Thanks for your report. I am currently working on this issue.
However, it may take some weeks to be completed, thanks for your patience.
Describe the bug When using the kernel in notebook, it works without any issues, however, inside VS Code there's no output when clicking the run button.
To Reproduce Steps to reproduce the behavior:
Expected behavior The code should run and display the output, it used to work with the past versions.
Desktop (please complete the following information):
Additional context Clicking the run button many times, eventually causes the OS to hang.