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bpo-36888: Add multiprocessing.parent_process() (GH-13247)

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Thomas Moreau 2019-05-20 21:37:05 +02:00 • committed by Antoine Pitrou
parent 5ae1c84bcd
commit c09a9f56c0
12 changed files with 155 additions and 20 deletions
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19
Lib/multiprocessing/spawn.py
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@ -100,25 +100,24 @@ def spawn_main(pipe_handle, parent_pid=None, tracker_fd=None):
if parent_pid is not None:
source_process = _winapi.OpenProcess(
_winapi.PROCESS_DUP_HANDLE, False, parent_pid)
_winapi.SYNCHRONIZE | _winapi.PROCESS_DUP_HANDLE,
False, parent_pid)
else:
source_process = None
try:
new_handle = reduction.duplicate(pipe_handle,
source_process=source_process)
finally:
if source_process is not None:
_winapi.CloseHandle(source_process)
new_handle = reduction.duplicate(pipe_handle,
source_process=source_process)
fd = msvcrt.open_osfhandle(new_handle, os.O_RDONLY)
parent_sentinel = source_process
else:
from . import resource_tracker
resource_tracker._resource_tracker._fd = tracker_fd
fd = pipe_handle
exitcode = _main(fd)
parent_sentinel = os.dup(pipe_handle)
exitcode = _main(fd, parent_sentinel)
sys.exit(exitcode)
def _main(fd):
def _main(fd, parent_sentinel):
with os.fdopen(fd, 'rb', closefd=True) as from_parent:
process.current_process()._inheriting = True
try:
@ -127,7 +126,7 @@ def _main(fd):
self = reduction.pickle.load(from_parent)
finally:
del process.current_process()._inheriting
return self._bootstrap()
return self._bootstrap(parent_sentinel)
def _check_not_importing_main():