Remove ThreadedSegment.write_lock

Assuming getattr(self, 'update_value') and setattr(self, 'update_value', value) 
are atomic. True with cpython unless somebody defined __getattribute__ or 
__setattr__.

powerline/bindings/vim/plugin/powerline.vim

@@ -84,7 +84,7 @@ endfunction
 augroup Powerline
 	autocmd! ColorScheme * :exec s:powerline_pycmd 'powerline.renderer.reset_highlight()'
 	autocmd! VimEnter    * :redrawstatus!
-	autocmd! VimLeave    * :exec s:powerline_pycmd 'powerline.shutdown()'
+	autocmd! VimLeavePre * :exec s:powerline_pycmd 'powerline.shutdown()'
 augroup END
 
 exec s:powerline_pycmd 'powerline = VimPowerline()'

powerline/lib/threaded.py

@@ -16,33 +16,39 @@ class ThreadedSegment(object):
 	def __init__(self):
 		super(ThreadedSegment, self).__init__()
 		self.shutdown_event = Event()
-		self.write_lock = Lock()
 		self.run_once = True
 		self.thread = None
 		self.skip = False
 		self.crashed_value = None
+		self.update_value = None
 
 	def __call__(self, pl, update_first=True, **kwargs):
 		if self.run_once:
 			self.pl = pl
 			self.set_state(**kwargs)
-			self.update()
+			update_value = self.get_update_value(True)
 		elif not self.is_alive():
 			# Without this we will not have to wait long until receiving bug “I 
 			# opened vim, but branch information is only shown after I move 
 			# cursor”.
 			#
 			# If running once .update() is called in __call__.
-			if update_first and self.update_first:
-				self.update()
+			update_value = self.get_update_value(update_first and self.update_first)
 			self.start()
 		elif not self.updated:
-			self.update()
+			update_value = self.get_update_value(True)
+		else:
+			update_value = self.update_value
 
 		if self.skip:
 			return self.crashed_value
-		with self.write_lock:
-			return self.render(update_first=update_first, pl=pl, **kwargs)
+
+		return self.render(update_value, update_first=update_first, pl=pl, **kwargs)
+
+	def get_update_value(self, update=False):
+		if update:
+			self.update_value = self.update(self.update_value)
+		return self.update_value
 
 	def is_alive(self):
 		return self.thread and self.thread.is_alive()
@@ -57,7 +63,7 @@ class ThreadedSegment(object):
 		while not self.shutdown_event.is_set():
 			start_time = monotonic()
 			try:
-				self.update()
+				self.update(self.update_value)
 			except Exception as e:
 				self.error('Exception while updating: {0}', str(e))
 				self.skip = True
@@ -115,48 +121,42 @@ class KwThreadedSegment(ThreadedSegment):
 
 	def __init__(self):
 		super(KwThreadedSegment, self).__init__()
-		self.queries = {}
-		self.crashed = set()
 		self.updated = True
+		self.update_value = ({}, set())
 
 	@staticmethod
 	def key(**kwargs):
 		return frozenset(kwargs.items())
 
-	def render(self, update_first, **kwargs):
+	def render(self, update_value, update_first, **kwargs):
+		queries, crashed = update_value
 		key = self.key(**kwargs)
-		if key in self.crashed:
+		if key in crashed:
 			return self.crashed_value
 
 		try:
-			update_state = self.queries[key][1]
+			update_state = queries[key][1]
 		except KeyError:
 			# Allow only to forbid to compute missing values: in either user 
 			# configuration or in subclasses.
 			update_state = self.compute_state(key) if update_first and self.update_first or self.run_once else None
 
-		# No locks: render method is already running with write_lock acquired.
-		self.queries[key] = (monotonic(), update_state)
+		queries[key] = (monotonic(), update_state)
 		return self.render_one(update_state, **kwargs)
 
-	def update(self):
+	def update(self, old_update_value):
 		updates = {}
-		removes = []
-		for key, (last_query_time, state) in list(self.queries.items()):
+		crashed = set()
+		update_value = (updates, crashed)
+		queries = old_update_value[0]
+		for key, (last_query_time, state) in queries.items():
 			if last_query_time < monotonic() < last_query_time + self.drop_interval:
 				try:
 					updates[key] = (last_query_time, self.compute_state(key))
 				except Exception as e:
 					self.exception('Exception while computing state for {0}: {1}', repr(key), str(e))
-					with self.write_lock:
-						self.crashed.add(key)
-			else:
-				removes.append(key)
-		with self.write_lock:
-			self.queries.update(updates)
-			self.crashed -= set(updates)
-			for key in removes:
-				self.queries.pop(key)
+					crashed.add(key)
+		return update_value
 
 	def set_state(self, interval=None, update_first=True, **kwargs):
 		self.set_interval(interval)
@@ -164,9 +164,6 @@ class KwThreadedSegment(ThreadedSegment):
 		if self.update_first:
 			self.update_first = update_first
 
-		with self.write_lock:
-			self.queries.clear()
-
 	@staticmethod
 	def render_one(update_state, **kwargs):
 		return update_state

powerline/segments/common.py

@@ -39,13 +39,13 @@ class RepositorySegment(KwThreadedSegment):
 	def key(pl, **kwargs):
 		return os.path.abspath(pl.getcwd())
 
-	def update(self):
+	def update(self, *args):
 		# .compute_state() is running only in this method, and only in one 
 		# thread, thus operations with .directories do not need write locks 
 		# (.render() method is not using .directories). If this is changed 
 		# .directories needs redesigning
 		self.directories.clear()
-		super(RepositorySegment, self).update()
+		return super(RepositorySegment, self).update(*args)
 
 	def compute_state(self, path):
 		repo = guess(path=path)
@@ -231,19 +231,19 @@ def _external_ip(query_url='http://ipv4.icanhazip.com/'):
 
 
 class ExternalIpSegment(ThreadedSegment):
+	interval = 10
+
 	def set_state(self, query_url='http://ipv4.icanhazip.com/', **kwargs):
 		self.query_url = query_url
 		super(ExternalIpSegment, self).set_state(**kwargs)
 
-	def update(self):
-		ip = _external_ip(query_url=self.query_url)
-		with self.write_lock:
-			self.ip = ip
+	def update(self, old_ip):
+		return _external_ip(query_url=self.query_url)
 
-	def render(self, **kwargs):
-		if not hasattr(self, 'ip'):
+	def render(self, ip, **kwargs):
+		if not ip:
 			return None
-		return [{'contents': self.ip, 'divider_highlight_group': 'background:divider'}]
+		return [{'contents': ip, 'divider_highlight_group': 'background:divider'}]
 
 
 external_ip = with_docstring(ExternalIpSegment(),
@@ -357,10 +357,9 @@ class WeatherSegment(ThreadedSegment):
 	def set_state(self, location_query=None, **kwargs):
 		self.location = location_query
 		self.url = None
-		self.condition = {}
 		super(WeatherSegment, self).set_state(**kwargs)
 
-	def update(self):
+	def update(self, old_weather):
 		import json
 
 		if not self.url:
@@ -398,31 +397,31 @@ class WeatherSegment(ThreadedSegment):
 				icon_names = ('unknown',)
 				self.error('Unknown condition code: {0}', condition_code)
 
-		with self.write_lock:
-			self.temp = temp
-			self.icon_names = icon_names
+		return (temp, icon_names)
 
-	def render(self, icons=None, unit='C', temp_format=None, temp_coldest=-30, temp_hottest=40, **kwargs):
-		if not hasattr(self, 'icon_names'):
+	def render(self, weather, icons=None, unit='C', temp_format=None, temp_coldest=-30, temp_hottest=40, **kwargs):
+		if not weather:
 			return None
 
-		for icon_name in self.icon_names:
+		temp, icon_names = weather
+
+		for icon_name in icon_names:
 			if icons:
 				if icon_name in icons:
 					icon = icons[icon_name]
 					break
 		else:
-			icon = weather_conditions_icons[self.icon_names[-1]]
+			icon = weather_conditions_icons[icon_names[-1]]
 
 		temp_format = temp_format or ('{temp:.0f}' + temp_units[unit])
-		temp = temp_conversions[unit](self.temp)
-		if self.temp <= temp_coldest:
+		converted_temp = temp_conversions[unit](temp)
+		if temp <= temp_coldest:
 			gradient_level = 0
-		elif self.temp >= temp_hottest:
+		elif temp >= temp_hottest:
 			gradient_level = 100
 		else:
-			gradient_level = (self.temp - temp_coldest) * 100.0 / (temp_hottest - temp_coldest)
-		groups = ['weather_condition_' + icon_name for icon_name in self.icon_names] + ['weather_conditions', 'weather']
+			gradient_level = (temp - temp_coldest) * 100.0 / (temp_hottest - temp_coldest)
+		groups = ['weather_condition_' + icon_name for icon_name in icon_names] + ['weather_conditions', 'weather']
 		return [
 			{
 				'contents': icon + ' ',
@@ -430,7 +429,7 @@ class WeatherSegment(ThreadedSegment):
 				'divider_highlight_group': 'background:divider',
 			},
 			{
-				'contents': temp_format.format(temp=temp),
+				'contents': temp_format.format(temp=converted_temp),
 				'highlight_group': ['weather_temp_gradient', 'weather_temp', 'weather'],
 				'draw_divider': False,
 				'divider_highlight_group': 'background:divider',

powerline/segments/vim.py

@@ -318,13 +318,13 @@ class RepositorySegment(KwWindowThreadedSegment):
 		# FIXME os.getcwd() is not a proper variant for non-current buffers
 		return segment_info['buffer'].name or os.getcwd()
 
-	def update(self):
+	def update(self, *args):
 		# .compute_state() is running only in this method, and only in one 
 		# thread, thus operations with .directories do not need write locks 
 		# (.render() method is not using .directories). If this is changed 
 		# .directories needs redesigning
 		self.directories.clear()
-		super(RepositorySegment, self).update()
+		return super(RepositorySegment, self).update(*args)
 
 	def compute_state(self, path):
 		repo = guess(path=path)

tests/lib/__init__.py

@@ -12,6 +12,7 @@ class Pl(object):
 		self.prefix = None
 		self.environ = {}
 		self.home = None
+		self.use_daemon_threads = True
 
 	def getcwd(self):
 		if isinstance(self._cwd, Exception):