| 1 | n/a | import io |
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| 2 | n/a | import os |
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| 3 | n/a | |
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| 4 | n/a | from .context import reduction, set_spawning_popen |
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| 5 | n/a | from . import popen_fork |
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| 6 | n/a | from . import spawn |
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| 7 | n/a | from . import util |
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| 8 | n/a | |
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| 9 | n/a | __all__ = ['Popen'] |
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| 10 | n/a | |
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| 11 | n/a | |
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| 12 | n/a | # |
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| 13 | n/a | # Wrapper for an fd used while launching a process |
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| 14 | n/a | # |
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| 15 | n/a | |
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| 16 | n/a | class _DupFd(object): |
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| 17 | n/a | def __init__(self, fd): |
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| 18 | n/a | self.fd = fd |
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| 19 | n/a | def detach(self): |
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| 20 | n/a | return self.fd |
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| 21 | n/a | |
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| 22 | n/a | # |
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| 23 | n/a | # Start child process using a fresh interpreter |
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| 24 | n/a | # |
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| 25 | n/a | |
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| 26 | n/a | class Popen(popen_fork.Popen): |
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| 27 | n/a | method = 'spawn' |
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| 28 | n/a | DupFd = _DupFd |
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| 29 | n/a | |
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| 30 | n/a | def __init__(self, process_obj): |
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| 31 | n/a | self._fds = [] |
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| 32 | n/a | super().__init__(process_obj) |
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| 33 | n/a | |
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| 34 | n/a | def duplicate_for_child(self, fd): |
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| 35 | n/a | self._fds.append(fd) |
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| 36 | n/a | return fd |
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| 37 | n/a | |
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| 38 | n/a | def _launch(self, process_obj): |
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| 39 | n/a | from . import semaphore_tracker |
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| 40 | n/a | tracker_fd = semaphore_tracker.getfd() |
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| 41 | n/a | self._fds.append(tracker_fd) |
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| 42 | n/a | prep_data = spawn.get_preparation_data(process_obj._name) |
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| 43 | n/a | fp = io.BytesIO() |
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| 44 | n/a | set_spawning_popen(self) |
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| 45 | n/a | try: |
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| 46 | n/a | reduction.dump(prep_data, fp) |
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| 47 | n/a | reduction.dump(process_obj, fp) |
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| 48 | n/a | finally: |
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| 49 | n/a | set_spawning_popen(None) |
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| 50 | n/a | |
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| 51 | n/a | parent_r = child_w = child_r = parent_w = None |
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| 52 | n/a | try: |
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| 53 | n/a | parent_r, child_w = os.pipe() |
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| 54 | n/a | child_r, parent_w = os.pipe() |
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| 55 | n/a | cmd = spawn.get_command_line(tracker_fd=tracker_fd, |
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| 56 | n/a | pipe_handle=child_r) |
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| 57 | n/a | self._fds.extend([child_r, child_w]) |
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| 58 | n/a | self.pid = util.spawnv_passfds(spawn.get_executable(), |
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| 59 | n/a | cmd, self._fds) |
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| 60 | n/a | self.sentinel = parent_r |
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| 61 | n/a | with open(parent_w, 'wb', closefd=False) as f: |
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| 62 | n/a | f.write(fp.getbuffer()) |
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| 63 | n/a | finally: |
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| 64 | n/a | if parent_r is not None: |
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| 65 | n/a | util.Finalize(self, os.close, (parent_r,)) |
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| 66 | n/a | for fd in (child_r, child_w, parent_w): |
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| 67 | n/a | if fd is not None: |
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| 68 | n/a | os.close(fd) |
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