> Do this:

> http://emptysquare.net/blog/pausing-with-tornado/

> Tornado isn't magic. If you call sleep(), it'll pause your whole process.
> You must explicitly return control to the IOLoop to allow it to continue
> processing requests.

> On Tuesday, October 2, 2012 5:51:54 PM UTC-4, aliane abdelouahab wrote:

>> look here, maybe it will help:

>> http://groups.google.com/group/python-tornado/browse_thread/thread/ae...

>> On 2 oct, 11:08, Li jiaming <li.jiam...@gmail.com> wrote:
>> > I created a simple app with gen.task. But seems doesn't work
>> > asynchronously. I try to call /sleep for multiple times, but it handles
>> > request in sequence.

>> > import tornado.ioloop
>> > import tornado.web
>> > from tornado.web import asynchronous
>> > from tornado import gen
>> > import time
>> > import tornado.httpserver

>> > class MainHandler(tornado.web.RequestHandler):
>> >     def get(self):
>> >         print 'receive root request'
>> >         self.write("Hello, world")

>> > class SleepHandler(tornado.web.RequestHandler):
>> >     @asynchronous
>> >     @gen.engine
>> >     def get(self):
>> >         print 'receive sleep request'
>> >         yield [ gen.Task(self.sleep, 10),
>> >                 gen.Task(self.sleep, 9)]
>> >         self.write("Wake up")
>> >         self.finish()

>> >     def sleep(self, sec, callback):
>> >         print 'sleep for %d seconds' % sec
>> >         time.sleep(sec)
>> >         print 'finish sleep %d' % sec
>> >         return callback()

>> > application = tornado.web.Application([
>> >     (r"/", MainHandler),
>> >     (r"/sleep", SleepHandler),
>> > ])

>> > if __name__ == "__main__":
>> >     server = tornado.httpserver.HTTPServer(application)
>> >     server.listen(8888)
>> >     tornado.ioloop.IOLoop.instance().start()

>> > *Anything wrong in my code?*

>> > I also tried async_callback (which is claimed to be obsoleted way of
>> doing
>> > async). But it works. It can handle multiple requests in parallel when
>> > calling /sleep.

>> > class SleepHandler(tornado.web.RequestHandler):
>> >     @asynchronous
>> >     def get(self):
>> >         print 'receive sleep request'
>> >         self.async_callback(self.callback_sleep, 10)

>> >     def callback_sleep(self, sec):
>> >         print 'callback sleep for %d seconds' % sec
>> >         time.sleep(sec)
>> >         print 'finish callback sleep for %d seconds' % sec
>> >         self.write('wake up')
>> >         self.finish()