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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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13
Lib/multiprocessing/popen_spawn_posix.py
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@ -2,7 +2,7 @@ import fcntl
import io
import os
from . import popen
from . import context
from . import popen_fork
from . import reduction
from . import spawn
@ -41,16 +41,16 @@ class Popen(popen_fork.Popen):
def _launch(self, process_obj):
from . import semaphore_tracker
tracker_fd = semaphore_tracker._semaphore_tracker_fd
tracker_fd = semaphore_tracker.getfd()
self._fds.append(tracker_fd)
prep_data = spawn.get_preparation_data(process_obj._name)
fp = io.BytesIO()
popen.set_spawning_popen(self)
context.set_spawning_popen(self)
try:
reduction.dump(prep_data, fp)
reduction.dump(process_obj, fp)
finally:
popen.set_spawning_popen(None)
context.set_spawning_popen(None)
parent_r = child_w = child_r = parent_w = None
try:
@ -70,8 +70,3 @@ class Popen(popen_fork.Popen):
for fd in (child_r, child_w, parent_w):
if fd is not None:
os.close(fd)
@staticmethod
def ensure_helpers_running():
from . import semaphore_tracker
semaphore_tracker.ensure_running()