Function spawn_main

Lib/multiprocessing/spawn.py:98–123

Run code specified by data received over pipe

(pipe_handle, parent_pid=None, tracker_fd=None)

def spawn_main(pipe_handle, parent_pid=None, tracker_fd=None):
    '''
    Run code specified by data received over pipe
    '''
    assert is_forking(sys.argv), "Not forking"
    if sys.platform == 'win32':
        import msvcrt
        import _winapi

        if parent_pid is not None:
            source_process = _winapi.OpenProcess(
                _winapi.SYNCHRONIZE | _winapi.PROCESS_DUP_HANDLE,
                False, parent_pid)
        else:
            source_process = None
        new_handle = reduction.duplicate(pipe_handle,
                                         source_process=source_process)
        fd = msvcrt.open_osfhandle(new_handle, os.O_RDONLY)
        parent_sentinel = source_process
    else:
        from . import resource_tracker
        resource_tracker._resource_tracker._fd = tracker_fd
        fd = pipe_handle
        parent_sentinel = os.dup(pipe_handle)
    exitcode = _main(fd, parent_sentinel)
    sys.exit(exitcode)


def _main(fd, parent_sentinel):