Пример #1
0
    def get(self, block=True, timeout=None):
        """Remove and return an item from the queue.

        If optional args 'block' is true and 'timeout' is None (the default),
        block if necessary until an item is available. If 'timeout' is
        a positive number, it blocks at most 'timeout' seconds and raises
        the Empty exception if no item was available within that time.
        Otherwise ('block' is false), return an item if one is immediately
        available, else raise the Empty exception ('timeout' is ignored
        in that case).
        """
        self.not_empty.acquire()
        try:
            if not block:
                if not self._qsize():
                    raise Empty
            elif timeout is None:
                while not self._qsize():
                    self.not_empty.wait()
            elif timeout < 0:
                raise ValueError("'timeout' must be a positive number")
            else:
                endtime = _time() + timeout
                while not self._qsize():
                    remaining = endtime - _time()
                    if remaining <= 0.0:
                        raise Empty
                    self.not_empty.wait(remaining)
            item = self._get()
            self.not_full.notify()
            return item
        finally:
            self.not_empty.release()
Пример #2
0
    def put(self, item, block=True, timeout=None):
        """Put an item into the queue.

        If optional args 'block' is true and 'timeout' is None (the default),
        block if necessary until a free slot is available. If 'timeout' is
        a positive number, it blocks at most 'timeout' seconds and raises
        the Full exception if no free slot was available within that time.
        Otherwise ('block' is false), put an item on the queue if a free slot
        is immediately available, else raise the Full exception ('timeout'
        is ignored in that case).
        """
        self.not_full.acquire()
        try:
            if self.maxsize > 0:
                if not block:
                    if self._qsize() == self.maxsize:
                        raise Full
                elif timeout is None:
                    while self._qsize() == self.maxsize:
                        self.not_full.wait()
                elif timeout < 0:
                    raise ValueError("'timeout' must be a positive number")
                else:
                    endtime = _time() + timeout
                    while self._qsize() == self.maxsize:
                        remaining = endtime - _time()
                        if remaining <= 0.0:
                            raise Full
                        self.not_full.wait(remaining)
            self._put(item)
            self.unfinished_tasks += 1
            self.not_empty.notify()
        finally:
            self.not_full.release()
Пример #3
0
    def get(self, block=True, timeout=None):
        """Remove and return an item from the queue.

        If optional args 'block' is true and 'timeout' is None (the default),
        block if necessary until an item is available. If 'timeout' is
        a positive number, it blocks at most 'timeout' seconds and raises
        the Empty exception if no item was available within that time.
        Otherwise ('block' is false), return an item if one is immediately
        available, else raise the Empty exception ('timeout' is ignored
        in that case).
        """
        self.not_empty.acquire()
        try:
            if not block:
                if not self._qsize():
                    raise Empty
            elif timeout is None:
                while not self._qsize():
                    self.not_empty.wait()
            elif timeout < 0:
                raise ValueError("'timeout' must be a positive number")
            else:
                endtime = _time() + timeout
                while not self._qsize():
                    remaining = endtime - _time()
                    if remaining <= 0.0:
                        raise Empty
                    self.not_empty.wait(remaining)
            item = self._get()
            self.not_full.notify()
            return item
        finally:
            self.not_empty.release()
Пример #4
0
    def put(self, item, block=True, timeout=None):
        """Put an item into the queue.

        If optional args 'block' is true and 'timeout' is None (the default),
        block if necessary until a free slot is available. If 'timeout' is
        a positive number, it blocks at most 'timeout' seconds and raises
        the Full exception if no free slot was available within that time.
        Otherwise ('block' is false), put an item on the queue if a free slot
        is immediately available, else raise the Full exception ('timeout'
        is ignored in that case).
        """
        self.not_full.acquire()
        try:
            if self.maxsize > 0:
                if not block:
                    if self._qsize() == self.maxsize:
                        raise Full
                elif timeout is None:
                    while self._qsize() == self.maxsize:
                        self.not_full.wait()
                elif timeout < 0:
                    raise ValueError("'timeout' must be a positive number")
                else:
                    endtime = _time() + timeout
                    while self._qsize() == self.maxsize:
                        remaining = endtime - _time()
                        if remaining <= 0.0:
                            raise Full
                        self.not_full.wait(remaining)
            self._put(item)
            self.unfinished_tasks += 1
            self.not_empty.notify()
        finally:
            self.not_full.release()
Пример #5
0
    def join(self, timeout=None):
        if not self.__initialized:
            raise RuntimeError("Thread.__init__() not called")
        if not self.__started.is_set():
            raise RuntimeError("cannot join thread before it is started")
        if self is current_thread():
            raise RuntimeError("cannot join current thread")

        if __debug__:
            if not self.__stopped:
                self._note("%s.join(): waiting until thread stops", self)
        self.__block.acquire()
        try:
            if timeout is None:
                while not self.__stopped:
                    self.__block.wait()
                if __debug__:
                    self._note("%s.join(): thread stopped", self)
            else:
                deadline = _time() + timeout
                while not self.__stopped:
                    delay = deadline - _time()
                    if delay <= 0:
                        if __debug__:
                            self._note("%s.join(): timed out", self)
                        break
                    self.__block.wait(delay)
                else:
                    if __debug__:
                        self._note("%s.join(): thread stopped", self)
        finally:
            self.__block.release()
Пример #6
0
 def wait(self, timeout=None):
     if not self._is_owned():
         raise RuntimeError("cannot wait on un-acquired lock")
     waiter = _allocate_lock()
     waiter.acquire()
     self.__waiters.append(waiter)
     saved_state = self._release_save()
     try:    # restore state no matter what (e.g., KeyboardInterrupt)
         if timeout is None:
             waiter.acquire()
             if __debug__:
                 self._note("%s.wait(): got it", self)
         else:
             # Balancing act:  We can't afford a pure busy loop, so we
             # have to sleep; but if we sleep the whole timeout time,
             # we'll be unresponsive.  The scheme here sleeps very
             # little at first, longer as time goes on, but never longer
             # than 20 times per second (or the timeout time remaining).
             endtime = _time() + timeout
             delay = 0.0005 # 500 us -> initial delay of 1 ms
             while True:
                 gotit = waiter.acquire(0)
                 if gotit:
                     break
                 remaining = endtime - _time()
                 if remaining <= 0:
                     break
                 delay = min(delay * 2, remaining, .05)
                 _sleep(delay)
             if not gotit:
                 if __debug__:
                     self._note("%s.wait(%s): timed out", self, timeout)
                 try:
                     self.__waiters.remove(waiter)
                 except ValueError:
                     pass
             else:
                 if __debug__:
                     self._note("%s.wait(%s): got it", self, timeout)
     finally:
         self._acquire_restore(saved_state)