mirror of
https://github.com/python/cpython.git
synced 2025-10-31 10:26:02 +00:00
998c3856c1
Use atexit for all multiprocessing start methods to cleanup. See the GH-114279 PR discussion and related issue for details as to why.
87 lines
2.5 KiB
Python
87 lines
2.5 KiB
Python
import atexit
|
|
import os
|
|
import signal
|
|
|
|
from . import util
|
|
|
|
__all__ = ['Popen']
|
|
|
|
#
|
|
# Start child process using fork
|
|
#
|
|
|
|
class Popen(object):
|
|
method = 'fork'
|
|
|
|
def __init__(self, process_obj):
|
|
util._flush_std_streams()
|
|
self.returncode = None
|
|
self.finalizer = None
|
|
self._launch(process_obj)
|
|
|
|
def duplicate_for_child(self, fd):
|
|
return fd
|
|
|
|
def poll(self, flag=os.WNOHANG):
|
|
if self.returncode is None:
|
|
try:
|
|
pid, sts = os.waitpid(self.pid, flag)
|
|
except OSError:
|
|
# Child process not yet created. See #1731717
|
|
# e.errno == errno.ECHILD == 10
|
|
return None
|
|
if pid == self.pid:
|
|
self.returncode = os.waitstatus_to_exitcode(sts)
|
|
return self.returncode
|
|
|
|
def wait(self, timeout=None):
|
|
if self.returncode is None:
|
|
if timeout is not None:
|
|
from multiprocessing.connection import wait
|
|
if not wait([self.sentinel], timeout):
|
|
return None
|
|
# This shouldn't block if wait() returned successfully.
|
|
return self.poll(os.WNOHANG if timeout == 0.0 else 0)
|
|
return self.returncode
|
|
|
|
def _send_signal(self, sig):
|
|
if self.returncode is None:
|
|
try:
|
|
os.kill(self.pid, sig)
|
|
except ProcessLookupError:
|
|
pass
|
|
except OSError:
|
|
if self.wait(timeout=0.1) is None:
|
|
raise
|
|
|
|
def terminate(self):
|
|
self._send_signal(signal.SIGTERM)
|
|
|
|
def kill(self):
|
|
self._send_signal(signal.SIGKILL)
|
|
|
|
def _launch(self, process_obj):
|
|
code = 1
|
|
parent_r, child_w = os.pipe()
|
|
child_r, parent_w = os.pipe()
|
|
self.pid = os.fork()
|
|
if self.pid == 0:
|
|
try:
|
|
atexit._clear()
|
|
atexit.register(util._exit_function)
|
|
os.close(parent_r)
|
|
os.close(parent_w)
|
|
code = process_obj._bootstrap(parent_sentinel=child_r)
|
|
finally:
|
|
atexit._run_exitfuncs()
|
|
os._exit(code)
|
|
else:
|
|
os.close(child_w)
|
|
os.close(child_r)
|
|
self.finalizer = util.Finalize(self, util.close_fds,
|
|
(parent_r, parent_w,))
|
|
self.sentinel = parent_r
|
|
|
|
def close(self):
|
|
if self.finalizer is not None:
|
|
self.finalizer()
|