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75 lines
2 KiB
Python
75 lines
2 KiB
Python
import fcntl
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import io
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import os
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from . import popen
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from . import popen_fork
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from . import reduction
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from . import spawn
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from . import util
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from . import current_process
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__all__ = ['Popen']
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#
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# Wrapper for an fd used while launching a process
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#
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class _DupFd(object):
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def __init__(self, fd):
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self.fd = fd
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def detach(self):
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return self.fd
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#
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# Start child process using a fresh interpreter
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#
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class Popen(popen_fork.Popen):
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method = 'spawn'
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DupFd = _DupFd
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def __init__(self, process_obj):
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self._fds = []
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super().__init__(process_obj)
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def duplicate_for_child(self, fd):
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self._fds.append(fd)
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return fd
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def _launch(self, process_obj):
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tracker_fd = current_process()._config['semaphore_tracker_fd']
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self._fds.append(tracker_fd)
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prep_data = spawn.get_preparation_data(process_obj._name)
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fp = io.BytesIO()
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popen.set_spawning_popen(self)
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try:
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reduction.dump(prep_data, fp)
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reduction.dump(process_obj, fp)
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finally:
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popen.set_spawning_popen(None)
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parent_r = child_w = child_r = parent_w = None
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try:
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parent_r, child_w = util.pipe()
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child_r, parent_w = util.pipe()
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cmd = spawn.get_command_line() + [str(child_r)]
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self._fds.extend([child_r, child_w])
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self.pid = util.spawnv_passfds(spawn.get_executable(),
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cmd, self._fds)
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self.sentinel = parent_r
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with open(parent_w, 'wb', closefd=False) as f:
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f.write(fp.getbuffer())
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finally:
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if parent_r is not None:
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util.Finalize(self, os.close, (parent_r,))
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for fd in (child_r, child_w, parent_w):
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if fd is not None:
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os.close(fd)
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@staticmethod
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def ensure_helpers_running():
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from . import semaphore_tracker
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semaphore_tracker.ensure_running()
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