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Issue #18999: Make multiprocessing use context objects.

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This allows different parts of a program to use different methods for
starting processes without interfering with each other.
This commit is contained in:
Richard Oudkerk 2013-10-16 16:41:56 +01:00
parent 3e4b52875e
commit b1694cf588
20 changed files with 733 additions and 611 deletions
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12
Lib/multiprocessing/popen_forkserver.py
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@ -4,8 +4,8 @@ import os
from . import reduction
if not reduction.HAVE_SEND_HANDLE:
raise ImportError('No support for sending fds between processes')
from . import context
from . import forkserver
from . import popen
from . import popen_fork
from . import spawn
from . import util
@ -42,12 +42,12 @@ class Popen(popen_fork.Popen):
def _launch(self, process_obj):
prep_data = spawn.get_preparation_data(process_obj._name)
buf = io.BytesIO()
popen.set_spawning_popen(self)
context.set_spawning_popen(self)
try:
reduction.dump(prep_data, buf)
reduction.dump(process_obj, buf)
finally:
popen.set_spawning_popen(None)
context.set_spawning_popen(None)
self.sentinel, w = forkserver.connect_to_new_process(self._fds)
util.Finalize(self, os.close, (self.sentinel,))
@ -67,9 +67,3 @@ class Popen(popen_fork.Popen):
# The process ended abnormally perhaps because of a signal
self.returncode = 255
return self.returncode
@staticmethod
def ensure_helpers_running():
from . import semaphore_tracker
semaphore_tracker.ensure_running()
forkserver.ensure_running()