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Name	Size	Permission	Date
__pycache__	[ DIR ]	drwxr-xr-x	2022-03-20 10:37
dummy	[ DIR ]	drwxrwxrwx	2022-03-20 10:37
__init__.py	923 B	-rw-r--r--	2021-11-04 16:29
connection.py	30.13 KB	-rw-r--r--	2021-11-04 16:29
context.py	10.43 KB	-rw-r--r--	2021-11-04 16:29
forkserver.py	7.78 KB	-rw-r--r--	2021-11-04 16:29
heap.py	8.13 KB	-rw-r--r--	2021-11-04 16:29
managers.py	35.12 KB	-rw-r--r--	2021-11-04 16:29
pool.py	24.14 KB	-rw-r--r--	2021-11-04 16:29
popen_fork.py	2.27 KB	-rw-r--r--	2021-11-04 16:29
popen_forkserver.py	1.92 KB	-rw-r--r--	2021-11-04 16:29
popen_spawn_posix.py	1.87 KB	-rw-r--r--	2021-11-04 16:29
popen_spawn_win32.py	2.93 KB	-rw-r--r--	2021-11-04 16:29
process.py	8.75 KB	-rw-r--r--	2021-11-04 16:29
queues.py	10.9 KB	-rw-r--r--	2021-11-04 16:29
reduction.py	7.92 KB	-rw-r--r--	2021-11-04 16:29
resource_sharer.py	5.19 KB	-rw-r--r--	2021-11-04 16:29
semaphore_tracker.py	4.71 KB	-rw-r--r--	2021-11-04 16:29
sharedctypes.py	6.08 KB	-rw-r--r--	2021-11-04 16:29
spawn.py	8.65 KB	-rw-r--r--	2021-11-04 16:29
synchronize.py	11.77 KB	-rw-r--r--	2021-11-04 16:29
util.py	10.99 KB	-rw-r--r--	2021-11-04 16:29

Rename

import io
import os

from . import context
from . import popen_fork
from . import reduction
from . import spawn
from . import util

__all__ = ['Popen']

#
# Wrapper for an fd used while launching a process
#

class _DupFd(object):
    def __init__(self, fd):
        self.fd = fd
    def detach(self):
        return self.fd

#
# Start child process using a fresh interpreter
#

class Popen(popen_fork.Popen):
    method = 'spawn'
    DupFd = _DupFd

def __init__(self, process_obj):
        self._fds = []
        super().__init__(process_obj)

def duplicate_for_child(self, fd):
        self._fds.append(fd)
        return fd

def _launch(self, process_obj):
        from . import semaphore_tracker
        tracker_fd = semaphore_tracker.getfd()
        self._fds.append(tracker_fd)
        prep_data = spawn.get_preparation_data(process_obj._name)
        fp = io.BytesIO()
        context.set_spawning_popen(self)
        try:
            reduction.dump(prep_data, fp)
            reduction.dump(process_obj, fp)
        finally:
            context.set_spawning_popen(None)

parent_r = child_w = child_r = parent_w = None
        try:
            parent_r, child_w = os.pipe()
            child_r, parent_w = os.pipe()
            cmd = spawn.get_command_line(tracker_fd=tracker_fd,
                                         pipe_handle=child_r)
            self._fds.extend([child_r, child_w])
            self.pid = util.spawnv_passfds(spawn.get_executable(),
                                           cmd, self._fds)
            self.sentinel = parent_r
            with open(parent_w, 'wb', closefd=False) as f:
                f.write(fp.getbuffer())
        finally:
            if parent_r is not None:
                util.Finalize(self, os.close, (parent_r,))
            for fd in (child_r, child_w, parent_w):
                if fd is not None:
                    os.close(fd)