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@@ -1,105 +1,107 b'' | |||
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1 | 1 | import io |
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2 | 2 | import json |
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3 | 3 | import os |
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4 | 4 | import sys |
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5 | 5 | |
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6 | 6 | pjoin = os.path.join |
|
7 | 7 | |
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8 | 8 | from IPython.utils.path import get_ipython_dir |
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9 | 9 | from IPython.utils.py3compat import PY3 |
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10 | 10 | from IPython.utils.traitlets import HasTraits, List, Unicode |
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11 | 11 | |
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12 | 12 | USER_KERNEL_DIR = pjoin(get_ipython_dir(), 'kernels') |
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13 | 13 | |
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14 | 14 | if os.name == 'nt': |
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15 | 15 | programdata = os.environ.get('PROGRAMDATA', None) |
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16 | 16 | if programdata: |
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17 | 17 | SYSTEM_KERNEL_DIR = pjoin(programdata, 'ipython', 'kernels') |
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18 | 18 | else: # PROGRAMDATA is not defined by default on XP. |
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19 | 19 | SYSTEM_KERNEL_DIR = None |
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20 | 20 | else: |
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21 | 21 | SYSTEM_KERNEL_DIR = "/usr/share/ipython/kernels" |
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22 | 22 | |
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23 | 23 | NATIVE_KERNEL_NAME = 'python3' if PY3 else 'python2' |
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24 | 24 | |
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25 | 25 | class KernelSpec(HasTraits): |
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26 | 26 | argv = List() |
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27 | 27 | display_name = Unicode() |
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28 | 28 | language = Unicode() |
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29 | 29 | codemirror_mode = Unicode() |
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30 | 30 | |
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31 | 31 | resource_dir = Unicode() |
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32 | 32 | |
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33 | 33 | def __init__(self, resource_dir, argv, display_name, language, |
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34 | 34 | codemirror_mode=None): |
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35 | 35 | super(KernelSpec, self).__init__(resource_dir=resource_dir, argv=argv, |
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36 | 36 | display_name=display_name, language=language, |
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37 | 37 | codemirror_mode=codemirror_mode) |
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38 | 38 | if not self.codemirror_mode: |
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39 | 39 | self.codemirror_mode = self.language |
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40 | 40 | |
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41 | 41 | @classmethod |
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42 | 42 | def from_resource_dir(cls, resource_dir): |
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43 | 43 | """Create a KernelSpec object by reading kernel.json |
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44 | 44 | |
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45 | 45 | Pass the path to the *directory* containing kernel.json. |
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46 | 46 | """ |
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47 | 47 | kernel_file = pjoin(resource_dir, 'kernel.json') |
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48 | 48 | with io.open(kernel_file, 'r', encoding='utf-8') as f: |
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49 | 49 | kernel_dict = json.load(f) |
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50 | 50 | return cls(resource_dir=resource_dir, **kernel_dict) |
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51 | 51 | |
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52 | 52 | def _is_kernel_dir(path): |
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53 | 53 | """Is ``path`` a kernel directory?""" |
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54 | 54 | return os.path.isdir(path) and os.path.isfile(pjoin(path, 'kernel.json')) |
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55 | 55 | |
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56 | 56 | def _list_kernels_in(dir): |
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57 | 57 | """Ensure dir exists, and return a mapping of kernel names to resource |
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58 | 58 | directories from it. |
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59 | 59 | """ |
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60 | 60 | if dir is None: |
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61 | 61 | return {} |
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62 | 62 | if not os.path.isdir(dir): |
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63 | 63 | os.makedirs(dir, mode=0o644) |
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64 | 64 | return {f.lower(): pjoin(dir, f) for f in os.listdir(dir) |
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65 | 65 | if _is_kernel_dir(pjoin(dir, f))} |
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66 | 66 | |
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67 | 67 | def _make_native_kernel_dir(): |
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68 | 68 | """Makes a kernel directory for the native kernel. |
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69 | 69 | |
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70 | 70 | The native kernel is the kernel using the same Python runtime as this |
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71 | 71 | process. This will put its informatino in the user kernels directory. |
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72 | 72 | """ |
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73 | 73 | path = pjoin(USER_KERNEL_DIR, NATIVE_KERNEL_NAME) |
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74 | 74 | os.mkdir(path) |
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75 | 75 | with io.open(pjoin(path, 'kernel.json'), 'w', encoding='utf-8') as f: |
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76 | 76 | json.dump({'argv':[NATIVE_KERNEL_NAME, '-c', |
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77 | 77 | 'from IPython.kernel.zmq.kernelapp import main; main()', |
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78 | 78 | '-f', '{connection_file}'], |
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79 | 79 | 'display_name': 'Python 3' if PY3 else 'Python 2', |
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80 | 80 | 'language': 'python', |
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81 | 81 | 'codemirror_mode': {'name': 'python', |
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82 | 82 | 'version': sys.version_info[0]}, |
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83 | 83 | }, |
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84 | 84 | f) |
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85 | 85 | # TODO: Copy icons into directory |
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86 | 86 | return path |
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87 | 87 | |
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88 | 88 | def list_kernel_specs(): |
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89 | 89 | """Returns a dict mapping kernel names to resource directories.""" |
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90 | 90 | d = _list_kernels_in(SYSTEM_KERNEL_DIR) |
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91 | 91 | d.update(_list_kernels_in(USER_KERNEL_DIR)) |
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92 | 92 | |
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93 | 93 | if NATIVE_KERNEL_NAME not in d: |
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94 | 94 | d[NATIVE_KERNEL_NAME] = _make_native_kernel_dir() |
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95 | 95 | return d |
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96 | 96 | # TODO: Caching? |
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97 | 97 | |
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98 | 98 | def get_kernel_spec(kernel_name): |
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99 | 99 | """Returns a :class:`KernelSpec` instance for the given kernel_name. |
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100 | 100 | |
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101 | 101 | Raises KeyError if the given kernel name is not found. |
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102 | 102 | """ |
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103 | if kernel_name == 'native': | |
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104 | kernel_name = NATIVE_KERNEL_NAME | |
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103 | 105 | d = list_kernel_specs() |
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104 | 106 | resource_dir = d[kernel_name.lower()] |
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105 | 107 | return KernelSpec.from_resource_dir(resource_dir) No newline at end of file |
@@ -1,389 +1,410 b'' | |||
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1 | 1 | """Base class to manage a running kernel""" |
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2 | 2 | |
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3 | 3 | #----------------------------------------------------------------------------- |
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4 | 4 | # Copyright (C) 2013 The IPython Development Team |
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5 | 5 | # |
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6 | 6 | # Distributed under the terms of the BSD License. The full license is in |
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7 | 7 | # the file COPYING, distributed as part of this software. |
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8 | 8 | #----------------------------------------------------------------------------- |
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9 | 9 | |
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10 | 10 | #----------------------------------------------------------------------------- |
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11 | 11 | # Imports |
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12 | 12 | #----------------------------------------------------------------------------- |
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13 | 13 | |
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14 | 14 | from __future__ import absolute_import |
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15 | 15 | |
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16 | 16 | # Standard library imports |
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17 | 17 | import re |
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18 | 18 | import signal |
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19 | 19 | import sys |
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20 | 20 | import time |
|
21 | import warnings | |
|
21 | 22 | |
|
22 | 23 | import zmq |
|
23 | 24 | |
|
24 | 25 | # Local imports |
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25 | 26 | from IPython.config.configurable import LoggingConfigurable |
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26 | 27 | from IPython.utils.importstring import import_item |
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27 | 28 | from IPython.utils.localinterfaces import is_local_ip, local_ips |
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28 | 29 | from IPython.utils.traitlets import ( |
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29 | 30 | Any, Instance, Unicode, List, Bool, Type, DottedObjectName |
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30 | 31 | ) |
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31 | 32 | from IPython.kernel import ( |
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32 | 33 | make_ipkernel_cmd, |
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33 | 34 | launch_kernel, |
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35 | kernelspec, | |
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34 | 36 | ) |
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35 | 37 | from .connect import ConnectionFileMixin |
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36 | 38 | from .zmq.session import Session |
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37 | 39 | from .managerabc import ( |
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38 | 40 | KernelManagerABC |
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39 | 41 | ) |
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40 | 42 | |
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41 | 43 | #----------------------------------------------------------------------------- |
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42 | 44 | # Main kernel manager class |
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43 | 45 | #----------------------------------------------------------------------------- |
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44 | 46 | |
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45 | 47 | class KernelManager(LoggingConfigurable, ConnectionFileMixin): |
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46 | 48 | """Manages a single kernel in a subprocess on this host. |
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47 | 49 | |
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48 | 50 | This version starts kernels with Popen. |
|
49 | 51 | """ |
|
50 | 52 | |
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51 | 53 | # The PyZMQ Context to use for communication with the kernel. |
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52 | 54 | context = Instance(zmq.Context) |
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53 | 55 | def _context_default(self): |
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54 | 56 | return zmq.Context.instance() |
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55 | 57 | |
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56 | 58 | # The Session to use for communication with the kernel. |
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57 | 59 | session = Instance(Session) |
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58 | 60 | def _session_default(self): |
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59 | 61 | return Session(parent=self) |
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60 | 62 | |
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61 | 63 | # the class to create with our `client` method |
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62 | 64 | client_class = DottedObjectName('IPython.kernel.blocking.BlockingKernelClient') |
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63 | 65 | client_factory = Type() |
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64 | 66 | def _client_class_changed(self, name, old, new): |
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65 | 67 | self.client_factory = import_item(str(new)) |
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66 | 68 | |
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67 | 69 | # The kernel process with which the KernelManager is communicating. |
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68 | 70 | # generally a Popen instance |
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69 | 71 | kernel = Any() |
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72 | ||
|
73 | kernel_name = Unicode('native') | |
|
74 | ||
|
75 | kernel_spec = Instance(kernelspec.KernelSpec) | |
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76 | ||
|
77 | def _kernel_spec_default(self): | |
|
78 | return kernelspec.get_kernel_spec(self.kernel_name) | |
|
79 | ||
|
80 | def _kernel_name_changed(self, name, old, new): | |
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81 | self.kernel_spec = kernelspec.get_kernel_spec(new) | |
|
82 | self.ipython_kernel = new in {'native', 'python2', 'python3'} | |
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70 | 83 | |
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71 | 84 | kernel_cmd = List(Unicode, config=True, |
|
72 | help="""The Popen Command to launch the kernel. | |
|
85 | help="""DEPRECATED: Use kernel_name instead. | |
|
86 | ||
|
87 | The Popen Command to launch the kernel. | |
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73 | 88 | Override this if you have a custom kernel. |
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74 | 89 | If kernel_cmd is specified in a configuration file, |
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75 | 90 | IPython does not pass any arguments to the kernel, |
|
76 | 91 | because it cannot make any assumptions about the |
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77 | 92 | arguments that the kernel understands. In particular, |
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78 | 93 | this means that the kernel does not receive the |
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79 | 94 | option --debug if it given on the IPython command line. |
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80 | 95 | """ |
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81 | 96 | ) |
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82 | 97 | |
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83 | 98 | def _kernel_cmd_changed(self, name, old, new): |
|
99 | warnings.warn("Setting kernel_cmd is deprecated, use kernel_spec to " | |
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100 | "start different kernels.") | |
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84 | 101 | self.ipython_kernel = False |
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85 | 102 | |
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86 | 103 | ipython_kernel = Bool(True) |
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87 | 104 | |
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88 | 105 | # Protected traits |
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89 | 106 | _launch_args = Any() |
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90 | 107 | _control_socket = Any() |
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91 | 108 | |
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92 | 109 | _restarter = Any() |
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93 | 110 | |
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94 | 111 | autorestart = Bool(False, config=True, |
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95 | 112 | help="""Should we autorestart the kernel if it dies.""" |
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96 | 113 | ) |
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97 | 114 | |
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98 | 115 | def __del__(self): |
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99 | 116 | self._close_control_socket() |
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100 | 117 | self.cleanup_connection_file() |
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101 | 118 | |
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102 | 119 | #-------------------------------------------------------------------------- |
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103 | 120 | # Kernel restarter |
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104 | 121 | #-------------------------------------------------------------------------- |
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105 | 122 | |
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106 | 123 | def start_restarter(self): |
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107 | 124 | pass |
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108 | 125 | |
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109 | 126 | def stop_restarter(self): |
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110 | 127 | pass |
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111 | 128 | |
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112 | 129 | def add_restart_callback(self, callback, event='restart'): |
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113 | 130 | """register a callback to be called when a kernel is restarted""" |
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114 | 131 | if self._restarter is None: |
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115 | 132 | return |
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116 | 133 | self._restarter.add_callback(callback, event) |
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117 | 134 | |
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118 | 135 | def remove_restart_callback(self, callback, event='restart'): |
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119 | 136 | """unregister a callback to be called when a kernel is restarted""" |
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120 | 137 | if self._restarter is None: |
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121 | 138 | return |
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122 | 139 | self._restarter.remove_callback(callback, event) |
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123 | 140 | |
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124 | 141 | #-------------------------------------------------------------------------- |
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125 | 142 | # create a Client connected to our Kernel |
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126 | 143 | #-------------------------------------------------------------------------- |
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127 | 144 | |
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128 | 145 | def client(self, **kwargs): |
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129 | 146 | """Create a client configured to connect to our kernel""" |
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130 | 147 | if self.client_factory is None: |
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131 | 148 | self.client_factory = import_item(self.client_class) |
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132 | 149 | |
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133 | 150 | kw = {} |
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134 | 151 | kw.update(self.get_connection_info()) |
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135 | 152 | kw.update(dict( |
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136 | 153 | connection_file=self.connection_file, |
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137 | 154 | session=self.session, |
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138 | 155 | parent=self, |
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139 | 156 | )) |
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140 | 157 | |
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141 | 158 | # add kwargs last, for manual overrides |
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142 | 159 | kw.update(kwargs) |
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143 | 160 | return self.client_factory(**kw) |
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144 | 161 | |
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145 | 162 | #-------------------------------------------------------------------------- |
|
146 | 163 | # Kernel management |
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147 | 164 | #-------------------------------------------------------------------------- |
|
148 | 165 | |
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149 | 166 | def format_kernel_cmd(self, **kw): |
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150 | 167 | """replace templated args (e.g. {connection_file})""" |
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151 | 168 | if self.kernel_cmd: |
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152 | 169 | cmd = self.kernel_cmd |
|
153 | else: | |
|
170 | elif self.kernel_name == 'native': | |
|
171 | # The native kernel gets special handling | |
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154 | 172 | cmd = make_ipkernel_cmd( |
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155 | 173 | 'from IPython.kernel.zmq.kernelapp import main; main()', |
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156 | 174 | **kw |
|
157 | 175 | ) |
|
176 | else: | |
|
177 | cmd = self.kernel_spec.argv | |
|
178 | ||
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158 | 179 | ns = dict(connection_file=self.connection_file) |
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159 | 180 | ns.update(self._launch_args) |
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160 | 181 | |
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161 | 182 | pat = re.compile(r'\{([A-Za-z0-9_]+)\}') |
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162 | 183 | def from_ns(match): |
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163 | 184 | """Get the key out of ns if it's there, otherwise no change.""" |
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164 | 185 | return ns.get(match.group(1), match.group()) |
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165 | 186 | |
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166 | 187 | return [ pat.sub(from_ns, arg) for arg in cmd ] |
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167 | 188 | |
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168 | 189 | def _launch_kernel(self, kernel_cmd, **kw): |
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169 | 190 | """actually launch the kernel |
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170 | 191 | |
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171 | 192 | override in a subclass to launch kernel subprocesses differently |
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172 | 193 | """ |
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173 | 194 | return launch_kernel(kernel_cmd, **kw) |
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174 | 195 | |
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175 | 196 | # Control socket used for polite kernel shutdown |
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176 | 197 | |
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177 | 198 | def _connect_control_socket(self): |
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178 | 199 | if self._control_socket is None: |
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179 | 200 | self._control_socket = self.connect_control() |
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180 | 201 | self._control_socket.linger = 100 |
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181 | 202 | |
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182 | 203 | def _close_control_socket(self): |
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183 | 204 | if self._control_socket is None: |
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184 | 205 | return |
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185 | 206 | self._control_socket.close() |
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186 | 207 | self._control_socket = None |
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187 | 208 | |
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188 | 209 | def start_kernel(self, **kw): |
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189 | 210 | """Starts a kernel on this host in a separate process. |
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190 | 211 | |
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191 | 212 | If random ports (port=0) are being used, this method must be called |
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192 | 213 | before the channels are created. |
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193 | 214 | |
|
194 | 215 | Parameters |
|
195 | 216 | ---------- |
|
196 | 217 | **kw : optional |
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197 | 218 | keyword arguments that are passed down to build the kernel_cmd |
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198 | 219 | and launching the kernel (e.g. Popen kwargs). |
|
199 | 220 | """ |
|
200 | 221 | if self.transport == 'tcp' and not is_local_ip(self.ip): |
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201 | 222 | raise RuntimeError("Can only launch a kernel on a local interface. " |
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202 | 223 | "Make sure that the '*_address' attributes are " |
|
203 | 224 | "configured properly. " |
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204 | 225 | "Currently valid addresses are: %s" % local_ips() |
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205 | 226 | ) |
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206 | 227 | |
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207 | 228 | # write connection file / get default ports |
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208 | 229 | self.write_connection_file() |
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209 | 230 | |
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210 | 231 | # save kwargs for use in restart |
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211 | 232 | self._launch_args = kw.copy() |
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212 | 233 | # build the Popen cmd |
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213 | 234 | kernel_cmd = self.format_kernel_cmd(**kw) |
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214 | 235 | # launch the kernel subprocess |
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215 | 236 | self.kernel = self._launch_kernel(kernel_cmd, |
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216 | 237 | ipython_kernel=self.ipython_kernel, |
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217 | 238 | **kw) |
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218 | 239 | self.start_restarter() |
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219 | 240 | self._connect_control_socket() |
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220 | 241 | |
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221 | 242 | def _send_shutdown_request(self, restart=False): |
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222 | 243 | """TODO: send a shutdown request via control channel""" |
|
223 | 244 | content = dict(restart=restart) |
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224 | 245 | msg = self.session.msg("shutdown_request", content=content) |
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225 | 246 | self.session.send(self._control_socket, msg) |
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226 | 247 | |
|
227 | 248 | def shutdown_kernel(self, now=False, restart=False): |
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228 | 249 | """Attempts to the stop the kernel process cleanly. |
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229 | 250 | |
|
230 | 251 | This attempts to shutdown the kernels cleanly by: |
|
231 | 252 | |
|
232 | 253 | 1. Sending it a shutdown message over the shell channel. |
|
233 | 254 | 2. If that fails, the kernel is shutdown forcibly by sending it |
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234 | 255 | a signal. |
|
235 | 256 | |
|
236 | 257 | Parameters |
|
237 | 258 | ---------- |
|
238 | 259 | now : bool |
|
239 | 260 | Should the kernel be forcible killed *now*. This skips the |
|
240 | 261 | first, nice shutdown attempt. |
|
241 | 262 | restart: bool |
|
242 | 263 | Will this kernel be restarted after it is shutdown. When this |
|
243 | 264 | is True, connection files will not be cleaned up. |
|
244 | 265 | """ |
|
245 | 266 | # Stop monitoring for restarting while we shutdown. |
|
246 | 267 | self.stop_restarter() |
|
247 | 268 | |
|
248 | 269 | # FIXME: Shutdown does not work on Windows due to ZMQ errors! |
|
249 | 270 | if now or sys.platform == 'win32': |
|
250 | 271 | if self.has_kernel: |
|
251 | 272 | self._kill_kernel() |
|
252 | 273 | else: |
|
253 | 274 | # Don't send any additional kernel kill messages immediately, to give |
|
254 | 275 | # the kernel a chance to properly execute shutdown actions. Wait for at |
|
255 | 276 | # most 1s, checking every 0.1s. |
|
256 | 277 | self._send_shutdown_request(restart=restart) |
|
257 | 278 | for i in range(10): |
|
258 | 279 | if self.is_alive(): |
|
259 | 280 | time.sleep(0.1) |
|
260 | 281 | else: |
|
261 | 282 | break |
|
262 | 283 | else: |
|
263 | 284 | # OK, we've waited long enough. |
|
264 | 285 | if self.has_kernel: |
|
265 | 286 | self._kill_kernel() |
|
266 | 287 | |
|
267 | 288 | if not restart: |
|
268 | 289 | self.cleanup_connection_file() |
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269 | 290 | self.cleanup_ipc_files() |
|
270 | 291 | else: |
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271 | 292 | self.cleanup_ipc_files() |
|
272 | 293 | |
|
273 | 294 | self._close_control_socket() |
|
274 | 295 | |
|
275 | 296 | def restart_kernel(self, now=False, **kw): |
|
276 | 297 | """Restarts a kernel with the arguments that were used to launch it. |
|
277 | 298 | |
|
278 | 299 | If the old kernel was launched with random ports, the same ports will be |
|
279 | 300 | used for the new kernel. The same connection file is used again. |
|
280 | 301 | |
|
281 | 302 | Parameters |
|
282 | 303 | ---------- |
|
283 | 304 | now : bool, optional |
|
284 | 305 | If True, the kernel is forcefully restarted *immediately*, without |
|
285 | 306 | having a chance to do any cleanup action. Otherwise the kernel is |
|
286 | 307 | given 1s to clean up before a forceful restart is issued. |
|
287 | 308 | |
|
288 | 309 | In all cases the kernel is restarted, the only difference is whether |
|
289 | 310 | it is given a chance to perform a clean shutdown or not. |
|
290 | 311 | |
|
291 | 312 | **kw : optional |
|
292 | 313 | Any options specified here will overwrite those used to launch the |
|
293 | 314 | kernel. |
|
294 | 315 | """ |
|
295 | 316 | if self._launch_args is None: |
|
296 | 317 | raise RuntimeError("Cannot restart the kernel. " |
|
297 | 318 | "No previous call to 'start_kernel'.") |
|
298 | 319 | else: |
|
299 | 320 | # Stop currently running kernel. |
|
300 | 321 | self.shutdown_kernel(now=now, restart=True) |
|
301 | 322 | |
|
302 | 323 | # Start new kernel. |
|
303 | 324 | self._launch_args.update(kw) |
|
304 | 325 | self.start_kernel(**self._launch_args) |
|
305 | 326 | |
|
306 | 327 | # FIXME: Messages get dropped in Windows due to probable ZMQ bug |
|
307 | 328 | # unless there is some delay here. |
|
308 | 329 | if sys.platform == 'win32': |
|
309 | 330 | time.sleep(0.2) |
|
310 | 331 | |
|
311 | 332 | @property |
|
312 | 333 | def has_kernel(self): |
|
313 | 334 | """Has a kernel been started that we are managing.""" |
|
314 | 335 | return self.kernel is not None |
|
315 | 336 | |
|
316 | 337 | def _kill_kernel(self): |
|
317 | 338 | """Kill the running kernel. |
|
318 | 339 | |
|
319 | 340 | This is a private method, callers should use shutdown_kernel(now=True). |
|
320 | 341 | """ |
|
321 | 342 | if self.has_kernel: |
|
322 | 343 | |
|
323 | 344 | # Signal the kernel to terminate (sends SIGKILL on Unix and calls |
|
324 | 345 | # TerminateProcess() on Win32). |
|
325 | 346 | try: |
|
326 | 347 | self.kernel.kill() |
|
327 | 348 | except OSError as e: |
|
328 | 349 | # In Windows, we will get an Access Denied error if the process |
|
329 | 350 | # has already terminated. Ignore it. |
|
330 | 351 | if sys.platform == 'win32': |
|
331 | 352 | if e.winerror != 5: |
|
332 | 353 | raise |
|
333 | 354 | # On Unix, we may get an ESRCH error if the process has already |
|
334 | 355 | # terminated. Ignore it. |
|
335 | 356 | else: |
|
336 | 357 | from errno import ESRCH |
|
337 | 358 | if e.errno != ESRCH: |
|
338 | 359 | raise |
|
339 | 360 | |
|
340 | 361 | # Block until the kernel terminates. |
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341 | 362 | self.kernel.wait() |
|
342 | 363 | self.kernel = None |
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343 | 364 | else: |
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344 | 365 | raise RuntimeError("Cannot kill kernel. No kernel is running!") |
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345 | 366 | |
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346 | 367 | def interrupt_kernel(self): |
|
347 | 368 | """Interrupts the kernel by sending it a signal. |
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348 | 369 | |
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349 | 370 | Unlike ``signal_kernel``, this operation is well supported on all |
|
350 | 371 | platforms. |
|
351 | 372 | """ |
|
352 | 373 | if self.has_kernel: |
|
353 | 374 | if sys.platform == 'win32': |
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354 | 375 | from .zmq.parentpoller import ParentPollerWindows as Poller |
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355 | 376 | Poller.send_interrupt(self.kernel.win32_interrupt_event) |
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356 | 377 | else: |
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357 | 378 | self.kernel.send_signal(signal.SIGINT) |
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358 | 379 | else: |
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359 | 380 | raise RuntimeError("Cannot interrupt kernel. No kernel is running!") |
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360 | 381 | |
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361 | 382 | def signal_kernel(self, signum): |
|
362 | 383 | """Sends a signal to the kernel. |
|
363 | 384 | |
|
364 | 385 | Note that since only SIGTERM is supported on Windows, this function is |
|
365 | 386 | only useful on Unix systems. |
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366 | 387 | """ |
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367 | 388 | if self.has_kernel: |
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368 | 389 | self.kernel.send_signal(signum) |
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369 | 390 | else: |
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370 | 391 | raise RuntimeError("Cannot signal kernel. No kernel is running!") |
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371 | 392 | |
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372 | 393 | def is_alive(self): |
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373 | 394 | """Is the kernel process still running?""" |
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374 | 395 | if self.has_kernel: |
|
375 | 396 | if self.kernel.poll() is None: |
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376 | 397 | return True |
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377 | 398 | else: |
|
378 | 399 | return False |
|
379 | 400 | else: |
|
380 | 401 | # we don't have a kernel |
|
381 | 402 | return False |
|
382 | 403 | |
|
383 | 404 | |
|
384 | 405 | #----------------------------------------------------------------------------- |
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385 | 406 | # ABC Registration |
|
386 | 407 | #----------------------------------------------------------------------------- |
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387 | 408 | |
|
388 | 409 | KernelManagerABC.register(KernelManager) |
|
389 | 410 |
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