python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Lib/multiprocessing/process.py

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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__ = ['BaseProcess', 'current_process', 'active_children']
+
+#
+# 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():
+    '''
+    Return process object representing the current process
+    '''
+    return _current_process
+
+def active_children():
+    '''
+    Return list of process objects corresponding to live child processes
+    '''
+    _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):
+    '''
+    Process objects represent activity that is run in a separate process
+
+    The class is analogous to `threading.Thread`
+    '''
+    def _Popen(self):
+        raise NotImplementedError
+
+    def __init__(self, group=None, target=None, name=None, args=(), kwargs={},
+                 *, daemon=None):
+        assert group is None, 'group argument must be None for now'
+        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__ + '-' + \
+                     ':'.join(str(i) for i in self._identity)
+        if daemon is not None:
+            self.daemon = daemon
+        _dangling.add(self)
+
+    def run(self):
+        '''
+        Method to be run in sub-process; can be overridden in sub-class
+        '''
+        if self._target:
+            self._target(*self._args, **self._kwargs)
+
+    def start(self):
+        '''
+        Start child process
+        '''
+        assert self._popen is None, 'cannot start a process twice'
+        assert self._parent_pid == os.getpid(), \
+               'can only start a process object created by current process'
+        assert not _current_process._config.get('daemon'), \
+               'daemonic processes are not allowed to have children'
+        _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):
+        '''
+        Terminate process; sends SIGTERM signal or uses TerminateProcess()
+        '''
+        self._popen.terminate()
+
+    def join(self, timeout=None):
+        '''
+        Wait until child process terminates
+        '''
+        assert self._parent_pid == os.getpid(), 'can only join a child process'
+        assert self._popen is not None, 'can only join a started process'
+        res = self._popen.wait(timeout)
+        if res is not None:
+            _children.discard(self)
+
+    def is_alive(self):
+        '''
+        Return whether process is alive
+        '''
+        if self is _current_process:
+            return True
+        assert self._parent_pid == os.getpid(), 'can only test a child process'
+
+        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), 'name must be a string'
+        self._name = name
+
+    @property
+    def daemon(self):
+        '''
+        Return whether process is a daemon
+        '''
+        return self._config.get('daemon', False)
+
+    @daemon.setter
+    def daemon(self, daemonic):
+        '''
+        Set whether process is a daemon
+        '''
+        assert self._popen is None, 'process has already started'
+        self._config['daemon'] = daemonic
+
+    @property
+    def authkey(self):
+        return self._config['authkey']
+
+    @authkey.setter
+    def authkey(self, authkey):
+        '''
+        Set authorization key of process
+        '''
+        self._config['authkey'] = AuthenticationString(authkey)
+
+    @property
+    def exitcode(self):
+        '''
+        Return exit code of process or `None` if it has yet to stop
+        '''
+        if self._popen is None:
+            return self._popen
+        return self._popen.poll()
+
+    @property
+    def ident(self):
+        '''
+        Return identifier (PID) of process or `None` if it has yet to start
+        '''
+        if self is _current_process:
+            return os.getpid()
+        else:
+            return self._popen and self._popen.pid
+
+    pid = ident
+
+    @property
+    def sentinel(self):
+        '''
+        Return a file descriptor (Unix) or handle (Windows) suitable for
+        waiting for process termination.
+        '''
+        try:
+            return self._sentinel
+        except AttributeError:
+            raise ValueError("process not started")
+
+    def __repr__(self):
+        if self is _current_process:
+            status = 'started'
+        elif self._parent_pid != os.getpid():
+            status = 'unknown'
+        elif self._popen is None:
+            status = 'initial'
+        else:
+            if self._popen.poll() is not None:
+                status = self.exitcode
+            else:
+                status = 'started'
+
+        if type(status) is int:
+            if status == 0:
+                status = 'stopped'
+            else:
+                status = 'stopped[%s]' % _exitcode_to_name.get(status, status)
+
+        return '<%s(%s, %s%s)>' % (type(self).__name__, self._name,
+                                   status, self.daemon and ' daemon' or '')
+
+    ##
+
+    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('child process calling self.run()')
+            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]) + '\n')
+                exitcode = 1
+        except:
+            exitcode = 1
+            import traceback
+            sys.stderr.write('Process %s:\n' % self.name)
+            traceback.print_exc()
+        finally:
+            util.info('process exiting with exitcode %d' % 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(
+                'Pickling an AuthenticationString object is '
+                'disallowed for security reasons'
+                )
+        return AuthenticationString, (bytes(self),)
+
+#
+# Create object representing the main process
+#
+
+class _MainProcess(BaseProcess):
+
+    def __init__(self):
+        self._identity = ()
+        self._name = 'MainProcess'
+        self._parent_pid = None
+        self._popen = None
+        self._config = {'authkey': AuthenticationString(os.urandom(32)),
+                        'semprefix': '/mp'}
+        # 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]=='SIG' and '_' not in name:
+        _exitcode_to_name[-signum] = name
+
+# For debug and leak testing
+_dangling = WeakSet()