Python threading._MainThread() Examples

def _set_SIGCHLD_handler():
    # Windows doesn't support SIGCHLD handler
    if sys.platform == 'win32':
        return
    # can't set signal in child threads
    if not isinstance(threading.current_thread(), threading._MainThread):
        return
    global _SIGCHLD_handler_set
    if _SIGCHLD_handler_set:
        return
    previous_handler = signal.getsignal(signal.SIGCHLD)
    if not callable(previous_handler):
        previous_handler = None

    def handler(signum, frame):
        # This following call uses `waitid` with WNOHANG from C side. Therefore,
        # Python can still get and update the process status successfully.
        _error_if_any_worker_fails()
        if previous_handler is not None:
            previous_handler(signum, frame)

    signal.signal(signal.SIGCHLD, handler)
    _SIGCHLD_handler_set = True 

def _set_SIGCHLD_handler():
    # Windows doesn't support SIGCHLD handler
    if sys.platform == 'win32':
        return
    # can't set signal in child threads
    if not isinstance(threading.current_thread(), threading._MainThread):
        return
    global _SIGCHLD_handler_set
    if _SIGCHLD_handler_set:
        return
    previous_handler = signal.getsignal(signal.SIGCHLD)
    if not callable(previous_handler):
        previous_handler = None

    def handler(signum, frame):
        # This following call uses `waitid` with WNOHANG from C side. Therefore,
        # Python can still get and update the process status successfully.
        _error_if_any_worker_fails()
        if previous_handler is not None:
            previous_handler(signum, frame)

    signal.signal(signal.SIGCHLD, handler)
    _SIGCHLD_handler_set = True 

def _set_SIGCHLD_handler():
    # Windows doesn't support SIGCHLD handler
    if sys.platform == 'win32':
        return
    # can't set signal in child threads
    if not isinstance(threading.current_thread(), threading._MainThread):
        return
    global _SIGCHLD_handler_set
    if _SIGCHLD_handler_set:
        return
    previous_handler = signal.getsignal(signal.SIGCHLD)
    if not callable(previous_handler):
        previous_handler = None

    def handler(signum, frame):
        # This following call uses `waitid` with WNOHANG from C side. Therefore,
        # Python can still get and update the process status successfully.
        _error_if_any_worker_fails()
        if previous_handler is not None:
            previous_handler(signum, frame)

    signal.signal(signal.SIGCHLD, handler)
    _SIGCHLD_handler_set = True 

def _set_SIGCHLD_handler():
    # Windows doesn't support SIGCHLD handler
    if sys.platform == "win32":
        return
    # can't set signal in child threads
    if not isinstance(threading.current_thread(), threading._MainThread):
        return
    global _SIGCHLD_handler_set
    if _SIGCHLD_handler_set:
        return
    previous_handler = signal.getsignal(signal.SIGCHLD)
    if not callable(previous_handler):
        previous_handler = None

    def handler(signum, frame):
        # This following call uses `waitid` with WNOHANG from C side. Therefore,
        # Python can still get and update the process status successfully.
        #  C._error_if_any_worker_fails()
        if previous_handler is not None:
            previous_handler(signum, frame)

    signal.signal(signal.SIGCHLD, handler)
    _SIGCHLD_handler_set = True 

def _set_SIGCHLD_handler():
    # Windows doesn't support SIGCHLD handler
    if sys.platform == 'win32':
        return
    # can't set signal in child threads
    if not isinstance(threading.current_thread(), threading._MainThread):
        return
    global _SIGCHLD_handler_set
    if _SIGCHLD_handler_set:
        return
    previous_handler = signal.getsignal(signal.SIGCHLD)
    if not callable(previous_handler):
        previous_handler = None

    def handler(signum, frame):
        # This following call uses `waitid` with WNOHANG from C side. Therefore,
        # Python can still get and update the process status successfully.
        #  C._error_if_any_worker_fails()
        if previous_handler is not None:
            previous_handler(signum, frame)

    signal.signal(signal.SIGCHLD, handler)
    _SIGCHLD_handler_set = True 

def _set_SIGCHLD_handler():
    # Windows doesn't support SIGCHLD handler
    if sys.platform == 'win32':
        return
    # can't set signal in child threads
    if not isinstance(threading.current_thread(), threading._MainThread):
        return
    global _SIGCHLD_handler_set
    if _SIGCHLD_handler_set:
        return
    previous_handler = signal.getsignal(signal.SIGCHLD)
    if not callable(previous_handler):
        previous_handler = None

    def handler(signum, frame):
        # This following call uses `waitid` with WNOHANG from C side. Therefore,
        # Python can still get and update the process status successfully.
        _error_if_any_worker_fails()
        if previous_handler is not None:
            previous_handler(signum, frame)

    signal.signal(signal.SIGCHLD, handler)
    _SIGCHLD_handler_set = True 

def call_on_qt_thread(func):
    @functools.wraps(func)
    def _call_on_qt_thread_wrapper(*args, **kwargs):
        # If the current thread is the main thread, which is the Qt thread, directly call the function.
        current_thread = threading.current_thread()
        if isinstance(current_thread, threading._MainThread):
            return func(*args, **kwargs)

        def _handle_call(ico, *args, **kwargs):
            ico.result = func(*args, **kwargs)
            ico.finish_event.set()
        inter_call_object = InterCallObject()
        new_args = tuple([inter_call_object] + list(args)[:])
        CuraApplication.getInstance().callLater(_handle_call, *new_args, **kwargs)
        inter_call_object.finish_event.wait()
        return inter_call_object.result
    return _call_on_qt_thread_wrapper 

def get_event_loop(self):
        """Get the event loop.

        This may be None or an instance of EventLoop.
        """
        if (self._local._loop is None and
                not self._local._set_called and
                isinstance(threading.current_thread(), threading._MainThread)):
            self.set_event_loop(self.new_event_loop())

        if self._local._loop is None:
            raise RuntimeError('There is no current event loop in thread %r.'
                               % threading.current_thread().name)

        return self._local._loop 

def is_main_thread():
    if six.PY2:
        return isinstance(threading.current_thread(), threading._MainThread)
    else:
        # a nicer solution with py3
        return threading.current_thread() == threading.main_thread() 

def effective_n_jobs(self, n_jobs):
        """Determine the number of jobs which are going to run in parallel.

        This also checks if we are attempting to create a nested parallel
        loop.
        """
        if mp is None:
            return 1

        if mp.current_process().daemon:
            # Daemonic processes cannot have children
            if n_jobs != 1:
                warnings.warn(
                    'Multiprocessing-backed parallel loops cannot be nested,'
                    ' setting n_jobs=1',
                    stacklevel=3)
            return 1

        if not isinstance(threading.current_thread(), threading._MainThread):
            # Prevent posix fork inside in non-main posix threads
            warnings.warn(
                'Multiprocessing-backed parallel loops cannot be nested'
                ' below threads, setting n_jobs=1',
                stacklevel=3)
            return 1

        return super(MultiprocessingBackend, self).effective_n_jobs(n_jobs) 

def get_event_loop(self):
        """Get the event loop.

        This may be None or an instance of EventLoop.
        """
        if (self._local._loop is None and
                not self._local._set_called and
                isinstance(threading.current_thread(), threading._MainThread)):
            self.set_event_loop(self.new_event_loop())

        if self._local._loop is None:
            raise RuntimeError('There is no current event loop in thread %r.'
                               % threading.current_thread().name)

        return self._local._loop 

def set_event_loop(self, loop):
        """Set the event loop.

        As a side effect, if a child watcher was set before, then calling
        .set_event_loop() from the main thread will call .attach_loop(loop) on
        the child watcher.
        """

        super().set_event_loop(loop)

        if (self._watcher is not None and
                isinstance(threading.current_thread(), threading._MainThread)):
            self._watcher.attach_loop(loop) 

def _init_watcher(self):
        with events._lock:
            if self._watcher is None:  # pragma: no branch
                self._watcher = SafeChildWatcher()
                if isinstance(threading.current_thread(),
                              threading._MainThread):
                    self._watcher.attach_loop(self._local._loop) 

def db_close(self):
    tid = threading.current_thread().ident
    if tid in self.dbs_dict:
      self.dbs_dict[tid].close()
      del self.dbs_dict[tid]
    if isinstance(threading.current_thread(), threading._MainThread):
      self.db.close() 

def _do_work(self, image_list):
        from oscap_docker_python.get_cve_input import getInputCVE

        self.scan_list = image_list
        cve_get = getInputCVE(self.image_tmp)
        if self.ac.fetch_cve_url != "":
            cve_get.url = self.ac.fetch_cve_url
        if self.ac.fetch_cve:
            cve_get.fetch_dist_data()
        threads = []
        mnt_dir = tempfile.mkdtemp()
        for image in image_list:
            if image in self.cs.dead_cids:
                raise ImageScannerClientError("Scan not completed. Cannot "
                                              "scan the dead "
                                              "container {0}".format(image))
            cids = self._get_cids_for_image(self.cs, image)
            t = threading.Thread(target=self.search_containers, name=image,
                                 args=(image, cids, self.output, mnt_dir,))
            threads.append(t)

        logging.info("Number of containers to scan: {0}".format(len(threads)))
        if isinstance(threading.current_thread(), threading._MainThread):
            signal.signal(signal.SIGINT, self.signal_handler)
        self.threads_complete = 0
        self.cur_scan_threads = 0
        while len(threads) > 0:
            if self.cur_scan_threads < self.procs:
                new_thread = threads.pop()
                new_thread.start()
                self.cur_scan_threads += 1

        while self.cur_scan_threads > 0:
            time.sleep(1)
            pass
        os.rmdir(mnt_dir)
        if self.failed_scan is not None:
            raise ImageScannerClientError(self.failed_scan)
        self.output.report_summary() 

def _init_watcher(self):
        with events._lock:
            if self._watcher is None:  # pragma: no branch
                self._watcher = SafeChildWatcher()
                if isinstance(threading.current_thread(),
                              threading._MainThread):
                    self._watcher.attach_loop(self._local._loop) 

def _init_watcher(self):
        with events._lock:   # 锁
            if self._watcher is None:  # pragma: no branch
                self._watcher = SafeChildWatcher()       # 孩子监视器

                # 当前线程为主线程
                if isinstance(threading.current_thread(), threading._MainThread):
                    self._watcher.attach_loop(self._local._loop)

    #
    # 对外接口: 设置事件循环
    # 

def _heartbeat(self):
        """ 放入线程的产生心跳
        """
        assert not isinstance(threading.currentThread(), threading._MainThread)
        while 1:
            try:
                self.load_next_request(HeartbeatRequest())
            except:
                pass
            time.sleep(60) 

def set_event_loop(self, loop):
        """Set the event loop.

        As a side effect, if a child watcher was set before, then calling
        .set_event_loop() from the main thread will call .attach_loop(loop) on
        the child watcher.
        """

        super().set_event_loop(loop)

        if (self._watcher is not None and
                isinstance(threading.current_thread(), threading._MainThread)):
            self._watcher.attach_loop(loop) 

def open_db(self):
    db = sqlite3.connect(self.db_name, check_same_thread=True)
    db.text_factory = str
    db.row_factory = sqlite3.Row

    tid = threading.current_thread().ident
    self.dbs_dict[tid] = db
    if isinstance(threading.current_thread(), threading._MainThread):
      self.db = db
      self.create_schema()
      db.execute("analyze") 

def _fetch(self, request, callback, kwargs, delay):
        if isinstance(threading.currentThread(), threading._MainThread):
            raise threading.ThreadError, "Can't run this function in _MainThread"
        time.sleep(delay)
        self.fetch(request, callback, **kwargs) 

def get_event_loop(self):
        """Get the event loop for the current context.

        Returns an instance of EventLoop or raises an exception.
        """
        if (self._local._loop is None and
                not self._local._set_called and
                isinstance(threading.current_thread(), threading._MainThread)):
            self.set_event_loop(self.new_event_loop())

        if self._local._loop is None:
            raise RuntimeError('There is no current event loop in thread %r.'
                               % threading.current_thread().name)

        return self._local._loop 

def set_event_loop(self, loop):
        """Set the event loop.

        As a side effect, if a child watcher was set before, then calling
        .set_event_loop() from the main thread will call .attach_loop(loop) on
        the child watcher.
        """

        super().set_event_loop(loop)

        if (self._watcher is not None and
                isinstance(threading.current_thread(), threading._MainThread)):
            self._watcher.attach_loop(loop) 

def _init_watcher(self):
        with events._lock:
            if self._watcher is None:  # pragma: no branch
                self._watcher = SafeChildWatcher()
                if isinstance(threading.current_thread(),
                              threading._MainThread):
                    self._watcher.attach_loop(self._local._loop) 

def get_event_loop(self):
        """Get the event loop.

        This may be None or an instance of EventLoop.
        """
        if (self._local._loop is None and
            not self._local._set_called and
            isinstance(threading.current_thread(), threading._MainThread)):
            self.set_event_loop(self.new_event_loop())
        if self._local._loop is None:
            raise RuntimeError('There is no current event loop in thread %r.'
                               % threading.current_thread().name)
        return self._local._loop 

def set_event_loop(self, loop):
        """Set the event loop.

        As a side effect, if a child watcher was set before, then calling
        .set_event_loop() from the main thread will call .attach_loop(loop) on
        the child watcher.
        """

        super().set_event_loop(loop)

        if self._watcher is not None and \
            isinstance(threading.current_thread(), threading._MainThread):
            self._watcher.attach_loop(loop) 

def _init_watcher(self):
        with events._lock:
            if self._watcher is None:  # pragma: no branch
                self._watcher = SafeChildWatcher()
                if isinstance(threading.current_thread(),
                              threading._MainThread):
                    self._watcher.attach_loop(self._local._loop) 

def effective_n_jobs(self, n_jobs):
        """Determine the number of jobs which are going to run in parallel.

        This also checks if we are attempting to create a nested parallel
        loop.
        """
        if mp is None:
            return 1

        if mp.current_process().daemon:
            # Daemonic processes cannot have children
            if n_jobs != 1:
                warnings.warn(
                    'Multiprocessing-backed parallel loops cannot be nested,'
                    ' setting n_jobs=1',
                    stacklevel=3)
            return 1

        if not isinstance(threading.current_thread(), threading._MainThread):
            # Prevent posix fork inside in non-main posix threads
            warnings.warn(
                'Multiprocessing-backed parallel loops cannot be nested'
                ' below threads, setting n_jobs=1',
                stacklevel=3)
            return 1

        return super(MultiprocessingBackend, self).effective_n_jobs(n_jobs) 

def get_event_loop(self):
        """Get the event loop.

        This may be None or an instance of EventLoop.
        """
        if (self._local._loop is None and
            not self._local._set_called and
            isinstance(threading.current_thread(), threading._MainThread)):
            self.set_event_loop(self.new_event_loop())
        if self._local._loop is None:
            raise RuntimeError('There is no current event loop in thread %r.'
                               % threading.current_thread().name)
        return self._local._loop 

def set_event_loop(self, loop):
        """Set the event loop.

        As a side effect, if a child watcher was set before, then calling
        .set_event_loop() from the main thread will call .attach_loop(loop) on
        the child watcher.
        """
        super().set_event_loop(loop)

        # 当前线程为主线程
        if self._watcher is not None and \
            isinstance(threading.current_thread(), threading._MainThread):
            self._watcher.attach_loop(loop)