Stackless Python 101

Nov 5, 20091 like1,704 views

The document is a presentation on Stackless Python, which extends Python with lightweight threading and tasklets. It discusses how Stackless provides more readable asynchronous code through tasklets and channels instead of callbacks. Examples show how tasklets can block and communicate without blocking the scheduler, allowing cooperative multitasking.

Stackless Python 101 An advanced level presentation in 20 minutes Kiwi PyCon 9 th November 2009 Richard Tew [email_address] www.stackless.com

What is Stackless? An extended version of Python.

What Stackless provides Lightweight threading.

More readable code def Function_1(): Function_2() def Function_2(): Current_Function() def Current_Function(): # whatever...

Reasons to block Allow other tasklets to run.

Example: Python sockets def Function_1(self): self.socket = socket(AF_INET, SOCK_STREAM) ... self.Function_2() def Blocking_Function(self): return self.socket.recv(1000)

stacklesssocket.py Third party library. Monkey patches in place of Python sockets import stacklesssocket stacklesssocket.install()

Example: Stackless sockets def Function_1(self): self.socket = socket(AF_INET, SOCK_STREAM) ... self.Function_2() def Blocking_Function(self): return self.socket.recv(1000)

Where's the readability? No callbacks. No boilerplate. Just a function call. do_something_i_dont_care_if_you_block()

Comparison: generators Generators block to the calling function. Not the scheduler. http://www.dabeaz.com/coroutines

Scheduling cooperatively Tasklets choose when to block stackless.schedule() channels... Run the scheduler until it is empty. stackless.run()

Scheduling preemptively while 1: interruptedTasklet = stackless.run(100) interruptedTasklet.insert() # Do other stuff.

Tasklets stackless.tasklet(print_args)(1, 2, x=“test“)

Tasklet yielding def print_args(*args, **kwargs): while 1: print 'args', args print 'kwargs', kwargs stackless.schedule()

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Stackless Python 101

1. Stackless Python 101 An advanced level presentation in 20 minutes Kiwi PyCon 9 th November 2009 Richard Tew [email_address] www.stackless.com

2. What is Stackless? An extended version of Python.

3. Backwards compatible.

4. Stable.

5. Who uses Stackless CCP Games

6. Who the hell knows?

7. What Stackless provides Lightweight threading.

8. More readable code.

9. Persistence of running code.

10. Lightweight threading?

11. The shared thread

12. More readable code def Function_1(): Function_2() def Function_2(): Current_Function() def Current_Function(): # whatever...

13. Reasons to block Allow other tasklets to run.

14. Reawaken when event occurs.

15. Reawaken when time has passed.

16. Example: Python sockets def Function_1(self): self.socket = socket(AF_INET, SOCK_STREAM) ... self.Function_2() def Blocking_Function(self): return self.socket.recv(1000)

17. stacklesssocket.py Third party library. Monkey patches in place of Python sockets import stacklesssocket stacklesssocket.install()

18. Example: Stackless sockets def Function_1(self): self.socket = socket(AF_INET, SOCK_STREAM) ... self.Function_2() def Blocking_Function(self): return self.socket.recv(1000)

19. Where's the readability? No callbacks. No boilerplate. Just a function call. do_something_i_dont_care_if_you_block()

20. Comparison: generators Generators block to the calling function. Not the scheduler. http://www.dabeaz.com/coroutines

21. Using Stackless Tasklets.

22. The scheduler.

23. Channels.

24. The scheduler stackless.run(...)

25. Scheduling cooperatively Tasklets choose when to block stackless.schedule() channels... Run the scheduler until it is empty. stackless.run()

26. Scheduling preemptively while 1: interruptedTasklet = stackless.run(100) interruptedTasklet.insert() # Do other stuff.

27. Tasklets stackless.tasklet(print_args)(1, 2, x=“test“)

28. Tasklets and threads

29. Tasklet yielding def print_args(*args, **kwargs): while 1: print 'args', args print 'kwargs', kwargs stackless.schedule()

30. Channels Used for: Tasklet blocking.

31. Tasklet communication.

32. Channel operations Sending: channel.send(value) Receiving: value = channel.receive()

33. One blocking tasklet def send_value(channel, value): channel.send(value) channel = stackless.channel() stackless.tasklet(send_value)(channel, 1) stackless.run()

34. Multiple blocking tasklets def send_value(channel, value): channel.send(value) channel = stackless.channel() stackless.tasklet(send_value)(channel, 1) stackless.tasklet(send_value)(channel, 2) stackless.tasklet(send_value)(channel, 3) stackless.run()

35. Emptying the channel def empty_channel(channel): print 'tasklets waiting:', channel.balance while channel.balance > 0: value = channel.receive() print 'received', value stackless.tasklet(empty_channel)(channel) stackless.run()

36. Idiom: Blocking out of the scheduler rapture_channel = stackless.channel() def wait_for_rapture(): rapture_channel.receive() def call_me_when_rapture_occurs(): while rapture_channel.balance < 0: rapture_channel.send(None)

37. What I have not covered Persistence of running code

38. Inter-thread channel usage.

39. C.

40. What you need to know You're on your own buddy... (almost)

41. Questions Stackless website: http://www.stackless.com Stackless examples: http://code.google.com/p/stacklessexamples

Stackless Python 101

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