1 _______________________________________
2 | python process |
3 | _________________________________ |
4 | | python thread | |
5 | | _____ ___________________ | |
6 | | | hub | | pool | | |
7 | | |_____| | _____________ | | |
8 | | | | greenthread | | | |
9 | | | |_____________| | | |
10 | | | _____________ | | |
11 | | | | greenthread | | | |
12 | | | |_____________| | | |
13 | | | | | |
14 | | | ... | | |
15 | | |___________________| | |
16 | |_________________________________| |
17 | |
18 | _________________________________ |
19 | | python thread | |
20 | |_________________________________| |
21 | ... |
22 |_______________________________________|
23
24 eventlet.spawnxxx －> Timer -> next_timer
25 evnetlet.sleep -> schedule_call_global -> hub.switch
26 hub.switch -> greenlet.switch -> run -> prepare_timers
27 -> first_timers -> waiter -> poll
28 read/write[eventlet.os] -> trampoline -> add -> listener
29 _______________________________________
30 | hub |
31 | ____________________________ |
32 | | listener | |
33 | | greenlet | |
34 | |____________________________| |
35 |_______________________________________|
36
37 _______________________________________
38 | greenthread |
39 | ____________________________ |
40 | | event | |
41 | | main | |
42 | |____________________________| |
43 |_______________________________________|
1 switch endpoint： eventlet.sleep, GreenThread.wait, acquire/release[event]
2 wakeup wait: call[Timer] -> main[GreenThread] -> send[Event]
3
4 note: 1. Only allow root greenlet to invoke eventlet.sleep
5
6 Example debug coroutine:
7
8 import eventlet
9 from eventlet.green import urllib2
10 from eventlet import debug
11
12 debug.hub_listener_stacks(True)
13 debug.hub_timer_stacks(True)
14 #debug.hub_blocking_detection(True)
15
16 urls = [
17 #"https://www.google.com/intl/en_ALL/images/logo.gif",
18 "http://python.org/images/python-logo.gif",
19 #"http://us.i1.yimg.com/us.yimg.com/i/ww/beta/y3.gif",
20 ]
21
22
23 def fetch(url):
24 print debug.format_hub_timers()
25 #print debug.format_hub_listeners()
26 body = urllib2.urlopen(url).read()
27 return url, body
28
29 pool = eventlet.GreenPool(200)
30 for url, body in pool.imap(fetch, urls):
31 print("got body from", url, "of length", len(body))
