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bpo-35491: Enhance multiprocessing.BaseProcess.__repr__() (GH-11138)

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* Add the pid and parent pid to multiprocessing.BaseProcess.__repr__().
* Add negative sign (ex: "-SIGTERM") to exitcode (process killed
  by a signal)
* Only call _popen.poll() once.

Example:
  <ForkProcess(ForkPoolWorker-1, started daemon)>
becomes:
  <ForkProcess name='ForkPoolWorker-1' pid=12449 parent=12448 started daemon>

Example:
  <ForkProcess(ForkPoolWorker-1, stopped[SIGTERM] daemon)>
becomes:
  <ForkProcess name='ForkPoolWorker-1' pid=12960 parent=12959 stopped exitcode=-SIGTERM daemon>
This commit is contained in:
Victor Stinner 2018-12-14 12:58:52 +01:00 • committed by GitHub
parent cb0f5e29e3
commit 7acd50ad8b
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 23 additions and 14 deletions
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27
Lib/multiprocessing/process.py
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@ -248,6 +248,7 @@ class BaseProcess(object):
raise ValueError("process not started") from None
def __repr__(self):
exitcode = None
if self is _current_process:
status = 'started'
elif self._closed:
@ -257,19 +258,23 @@ class BaseProcess(object):
elif self._popen is None:
status = 'initial'
else:
if self._popen.poll() is not None:
status = self.exitcode
exitcode = self._popen.poll()
if exitcode is not None:
status = 'stopped'
else:
status = 'started'
if type(status) is int:
if status == 0:
status = 'stopped'
else:
status = 'stopped[%s]' % _exitcode_to_name.get(status, status)
return '<%s(%s, %s%s)>' % (type(self).__name__, self._name,
status, self.daemon and ' daemon' or '')
info = [type(self).__name__, 'name=%r' % self._name]
if self._popen is not None:
info.append('pid=%s' % self._popen.pid)
info.append('parent=%s' % self._parent_pid)
info.append(status)
if exitcode is not None:
exitcode = _exitcode_to_name.get(exitcode, exitcode)
info.append('exitcode=%s' % exitcode)
if self.daemon:
info.append('daemon')
return '<%s>' % ' '.join(info)
##
@ -373,7 +378,7 @@ _exitcode_to_name = {}
for name, signum in list(signal.__dict__.items()):
if name[:3]=='SIG' and '_' not in name:
_exitcode_to_name[-signum] = name
_exitcode_to_name[-signum] = f'-{name}'
# For debug and leak testing
_dangling = WeakSet()