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proc
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self
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root
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opt
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alt
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python36
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lib64
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python3.6
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multiprocessing
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files >> //proc/self/root/opt/alt/python36/lib64/python3.6/multiprocessing/popen_forkserver.py
import io import os from .context import reduction, set_spawning_popen if not reduction.HAVE_SEND_HANDLE: raise ImportError('No support for sending fds between processes') from . import forkserver from . import popen_fork from . import spawn from . import util __all__ = ['Popen'] # # Wrapper for an fd used while launching a process # class _DupFd(object): def __init__(self, ind): self.ind = ind def detach(self): return forkserver.get_inherited_fds()[self.ind] # # Start child process using a server process # class Popen(popen_fork.Popen): method = 'forkserver' DupFd = _DupFd def __init__(self, process_obj): self._fds = [] super().__init__(process_obj) def duplicate_for_child(self, fd): self._fds.append(fd) return len(self._fds) - 1 def _launch(self, process_obj): prep_data = spawn.get_preparation_data(process_obj._name) buf = io.BytesIO() set_spawning_popen(self) try: reduction.dump(prep_data, buf) reduction.dump(process_obj, buf) finally: set_spawning_popen(None) self.sentinel, w = forkserver.connect_to_new_process(self._fds) util.Finalize(self, os.close, (self.sentinel,)) with open(w, 'wb', closefd=True) as f: f.write(buf.getbuffer()) self.pid = forkserver.read_unsigned(self.sentinel) def poll(self, flag=os.WNOHANG): if self.returncode is None: from multiprocessing.connection import wait timeout = 0 if flag == os.WNOHANG else None if not wait([self.sentinel], timeout): return None try: self.returncode = forkserver.read_unsigned(self.sentinel) except (OSError, EOFError): # The process ended abnormally perhaps because of a signal self.returncode = 255 return self.returncode
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