1 files changed, 26 insertions, 33 deletions
diff --git a/Lib/mutex.py b/Lib/mutex.py
index 33509c7..9271d34 100644
--- a/Lib/mutex.py
+++ b/Lib/mutex.py
@@ -1,58 +1,51 @@
-# Mutual exclusion -- for use with module sched
+"""Mutual exclusion -- for use with module sched
+
+A mutex has two pieces of state -- a 'locked' bit and a queue.
+When the mutex is not locked, the queue is empty.
+Otherwise, the queue contains 0 or more (function, argument) pairs
+representing functions (or methods) waiting to acquire the lock.
+When the mutex is unlocked while the queue is not empty,
+the first queue entry is removed and its function(argument) pair called,
+implying it now has the lock.
+
+Of course, no multi-threading is implied -- hence the funny interface
+for lock, where a function is called once the lock is aquired.
+"""
 
-# A mutex has two pieces of state -- a 'locked' bit and a queue.
-# When the mutex is not locked, the queue is empty.
-# Otherwise, the queue contains 0 or more (function, argument) pairs
-# representing functions (or methods) waiting to acquire the lock.
-# When the mutex is unlocked while the queue is not empty,
-# the first queue entry is removed and its function(argument) pair called,
-# implying it now has the lock.
-#
-# Of course, no multi-threading is implied -- hence the funny interface
-# for lock, where a function is called once the lock is aquired.
-#
 class mutex:
-	#
-	# Create a new mutex -- initially unlocked
-	#
 	def __init__(self):
+		"""Create a new mutex -- initially unlocked."""
 		self.locked = 0
 		self.queue = []
-	#
-	# Test the locked bit of the mutex
-	#
+
 	def test(self):
+		"""Test the locked bit of the mutex."""
 		return self.locked
-	#
-	# Atomic test-and-set -- grab the lock if it is not set,
-	# return true if it succeeded
-	#
+
 	def testandset(self):
+		"""Atomic test-and-set -- grab the lock if it is not set,
+		return true if it succeeded."""
 		if not self.locked:
 			self.locked = 1
 			return 1
 		else:
 			return 0
-	#
-	# Lock a mutex, call the function with supplied argument
-	# when it is acquired.
-	# If the mutex is already locked, place function and argument
-	# in the queue.
-	#
+
 	def lock(self, function, argument):
+		"""Lock a mutex, call the function with supplied argument
+		when it is acquired.  If the mutex is already locked, place
+		function and argument in the queue."""
 		if self.testandset():
 			function(argument)
 		else:
 			self.queue.append((function, argument))
-	#
-	# Unlock a mutex.  If the queue is not empty, call the next
-	# function with its argument.
-	#
+
 	def unlock(self):
+		"""Unlock a mutex.  If the queue is not empty, call the next
+		function with its argument."""
 		if self.queue:
 			function, argument = self.queue[0]
 			del self.queue[0]
 			function(argument)
 		else:
 			self.locked = 0
-	#