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# Module providing the `Process` class which emulates `threading.Thread`
#
# multiprocessing/process.py
#
# Copyright (c) 2006-2008, R Oudkerk
# Licensed to PSF under a Contributor Agreement.
#

__all__ = [&#039;BaseProcess&#039;, &#039;current_process&#039;, &#039;active_children&#039;]

#
# Imports
#

import os
import sys
import signal
import itertools
from _weakrefset import WeakSet

#
#
#

try:
    ORIGINAL_DIR = os.path.abspath(os.getcwd())
except OSError:
    ORIGINAL_DIR = None

#
# Public functions
#

def current_process():
    &#039;&#039;&#039;
    Return process object representing the current process
    &#039;&#039;&#039;
    return _current_process

def active_children():
    &#039;&#039;&#039;
    Return list of process objects corresponding to live child processes
    &#039;&#039;&#039;
    _cleanup()
    return list(_children)

#
#
#

def _cleanup():
    # check for processes which have finished
    for p in list(_children):
        if p._popen.poll() is not None:
            _children.discard(p)

#
# The `Process` class
#

class BaseProcess(object):
    &#039;&#039;&#039;
    Process objects represent activity that is run in a separate process

    The class is analogous to `threading.Thread`
    &#039;&#039;&#039;
    def _Popen(self):
        raise NotImplementedError

    def __init__(self, group=None, target=None, name=None, args=(), kwargs={},
                 *, daemon=None):
        assert group is None, &#039;group argument must be None for now&#039;
        count = next(_process_counter)
        self._identity = _current_process._identity + (count,)
        self._config = _current_process._config.copy()
        self._parent_pid = os.getpid()
        self._popen = None
        self._target = target
        self._args = tuple(args)
        self._kwargs = dict(kwargs)
        self._name = name or type(self).__name__ + &#039;-&#039; + \
                     &#039;:&#039;.join(str(i) for i in self._identity)
        if daemon is not None:
            self.daemon = daemon
        _dangling.add(self)

    def run(self):
        &#039;&#039;&#039;
        Method to be run in sub-process; can be overridden in sub-class
        &#039;&#039;&#039;
        if self._target:
            self._target(*self._args, **self._kwargs)

    def start(self):
        &#039;&#039;&#039;
        Start child process
        &#039;&#039;&#039;
        assert self._popen is None, &#039;cannot start a process twice&#039;
        assert self._parent_pid == os.getpid(), \
               &#039;can only start a process object created by current process&#039;
        assert not _current_process._config.get(&#039;daemon&#039;), \
               &#039;daemonic processes are not allowed to have children&#039;
        _cleanup()
        self._popen = self._Popen(self)
        self._sentinel = self._popen.sentinel
        # Avoid a refcycle if the target function holds an indirect
        # reference to the process object (see bpo-30775)
        del self._target, self._args, self._kwargs
        _children.add(self)

    def terminate(self):
        &#039;&#039;&#039;
        Terminate process; sends SIGTERM signal or uses TerminateProcess()
        &#039;&#039;&#039;
        self._popen.terminate()

    def join(self, timeout=None):
        &#039;&#039;&#039;
        Wait until child process terminates
        &#039;&#039;&#039;
        assert self._parent_pid == os.getpid(), &#039;can only join a child process&#039;
        assert self._popen is not None, &#039;can only join a started process&#039;
        res = self._popen.wait(timeout)
        if res is not None:
            _children.discard(self)

    def is_alive(self):
        &#039;&#039;&#039;
        Return whether process is alive
        &#039;&#039;&#039;
        if self is _current_process:
            return True
        assert self._parent_pid == os.getpid(), &#039;can only test a child process&#039;

        if self._popen is None:
            return False

        returncode = self._popen.poll()
        if returncode is None:
            return True
        else:
            _children.discard(self)
            return False

    @property
    def name(self):
        return self._name

    @name.setter
    def name(self, name):
        assert isinstance(name, str), &#039;name must be a string&#039;
        self._name = name

    @property
    def daemon(self):
        &#039;&#039;&#039;
        Return whether process is a daemon
        &#039;&#039;&#039;
        return self._config.get(&#039;daemon&#039;, False)

    @daemon.setter
    def daemon(self, daemonic):
        &#039;&#039;&#039;
        Set whether process is a daemon
        &#039;&#039;&#039;
        assert self._popen is None, &#039;process has already started&#039;
        self._config[&#039;daemon&#039;] = daemonic

    @property
    def authkey(self):
        return self._config[&#039;authkey&#039;]

    @authkey.setter
    def authkey(self, authkey):
        &#039;&#039;&#039;
        Set authorization key of process
        &#039;&#039;&#039;
        self._config[&#039;authkey&#039;] = AuthenticationString(authkey)

    @property
    def exitcode(self):
        &#039;&#039;&#039;
        Return exit code of process or `None` if it has yet to stop
        &#039;&#039;&#039;
        if self._popen is None:
            return self._popen
        return self._popen.poll()

    @property
    def ident(self):
        &#039;&#039;&#039;
        Return identifier (PID) of process or `None` if it has yet to start
        &#039;&#039;&#039;
        if self is _current_process:
            return os.getpid()
        else:
            return self._popen and self._popen.pid

    pid = ident

    @property
    def sentinel(self):
        &#039;&#039;&#039;
        Return a file descriptor (Unix) or handle (Windows) suitable for
        waiting for process termination.
        &#039;&#039;&#039;
        try:
            return self._sentinel
        except AttributeError:
            raise ValueError(&quot;process not started&quot;)

    def __repr__(self):
        if self is _current_process:
            status = &#039;started&#039;
        elif self._parent_pid != os.getpid():
            status = &#039;unknown&#039;
        elif self._popen is None:
            status = &#039;initial&#039;
        else:
            if self._popen.poll() is not None:
                status = self.exitcode
            else:
                status = &#039;started&#039;

        if type(status) is int:
            if status == 0:
                status = &#039;stopped&#039;
            else:
                status = &#039;stopped[%s]&#039; % _exitcode_to_name.get(status, status)

        return &#039;&lt;%s(%s, %s%s)&gt;&#039; % (type(self).__name__, self._name,
                                   status, self.daemon and &#039; daemon&#039; or &#039;&#039;)

    ##

    def _bootstrap(self):
        from . import util, context
        global _current_process, _process_counter, _children

        try:
            if self._start_method is not None:
                context._force_start_method(self._start_method)
            _process_counter = itertools.count(1)
            _children = set()
            util._close_stdin()
            old_process = _current_process
            _current_process = self
            try:
                util._finalizer_registry.clear()
                util._run_after_forkers()
            finally:
                # delay finalization of the old process object until after
                # _run_after_forkers() is executed
                del old_process
            util.info(&#039;child process calling self.run()&#039;)
            try:
                self.run()
                exitcode = 0
            finally:
                util._exit_function()
        except SystemExit as e:
            if not e.args:
                exitcode = 1
            elif isinstance(e.args[0], int):
                exitcode = e.args[0]
            else:
                sys.stderr.write(str(e.args[0]) + &#039;\n&#039;)
                exitcode = 1
        except:
            exitcode = 1
            import traceback
            sys.stderr.write(&#039;Process %s:\n&#039; % self.name)
            traceback.print_exc()
        finally:
            util.info(&#039;process exiting with exitcode %d&#039; % exitcode)
            util._flush_std_streams()

        return exitcode

#
# We subclass bytes to avoid accidental transmission of auth keys over network
#

class AuthenticationString(bytes):
    def __reduce__(self):
        from .context import get_spawning_popen
        if get_spawning_popen() is None:
            raise TypeError(
                &#039;Pickling an AuthenticationString object is &#039;
                &#039;disallowed for security reasons&#039;
                )
        return AuthenticationString, (bytes(self),)

#
# Create object representing the main process
#

class _MainProcess(BaseProcess):

    def __init__(self):
        self._identity = ()
        self._name = &#039;MainProcess&#039;
        self._parent_pid = None
        self._popen = None
        self._config = {&#039;authkey&#039;: AuthenticationString(os.urandom(32)),
                        &#039;semprefix&#039;: &#039;/mp&#039;}
        # Note that some versions of FreeBSD only allow named
        # semaphores to have names of up to 14 characters.  Therefore
        # we choose a short prefix.
        #
        # On MacOSX in a sandbox it may be necessary to use a
        # different prefix -- see #19478.
        #
        # Everything in self._config will be inherited by descendant
        # processes.


_current_process = _MainProcess()
_process_counter = itertools.count(1)
_children = set()
del _MainProcess

#
# Give names to some return codes
#

_exitcode_to_name = {}

for name, signum in list(signal.__dict__.items()):
    if name[:3]==&#039;SIG&#039; and &#039;_&#039; not in name:
        _exitcode_to_name[-signum] = name

# For debug and leak testing
_dangling = WeakSet()
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