| 36 | return fd |
| 37 | |
| 38 | def _launch(self, process_obj): |
| 39 | from . import resource_tracker |
| 40 | tracker_fd = resource_tracker.getfd() |
| 41 | self._fds.append(tracker_fd) |
| 42 | prep_data = spawn.get_preparation_data(process_obj._name) |
| 43 | fp = io.BytesIO() |
| 44 | set_spawning_popen(self) |
| 45 | try: |
| 46 | reduction.dump(prep_data, fp) |
| 47 | reduction.dump(process_obj, fp) |
| 48 | finally: |
| 49 | set_spawning_popen(None) |
| 50 | |
| 51 | parent_r = child_w = child_r = parent_w = None |
| 52 | try: |
| 53 | parent_r, child_w = os.pipe() |
| 54 | child_r, parent_w = os.pipe() |
| 55 | cmd = spawn.get_command_line(tracker_fd=tracker_fd, |
| 56 | pipe_handle=child_r) |
| 57 | self._fds.extend([child_r, child_w]) |
| 58 | self.pid = util.spawnv_passfds(spawn.get_executable(), |
| 59 | cmd, self._fds) |
| 60 | os.close(child_r) |
| 61 | child_r = None |
| 62 | os.close(child_w) |
| 63 | child_w = None |
| 64 | self.sentinel = parent_r |
| 65 | with open(parent_w, 'wb', closefd=False) as f: |
| 66 | f.write(fp.getbuffer()) |
| 67 | finally: |
| 68 | fds_to_close = [] |
| 69 | for fd in (parent_r, parent_w): |
| 70 | if fd is not None: |
| 71 | fds_to_close.append(fd) |
| 72 | self.finalizer = util.Finalize(self, util.close_fds, fds_to_close) |
| 73 | |
| 74 | for fd in (child_r, child_w): |
| 75 | if fd is not None: |
| 76 | os.close(fd) |