event-loop

问题 The following code just hangs without ever printing anything: import asyncio async def foo(loop): print('foo') loop.stop() loop = asyncio.new_event_loop() asyncio.ensure_future(foo(loop)) loop.run_forever() If I use get_event_loop everything works fine. Is there something I'm doing wrong or have I stumbled upon a bug? I'm using Python 3.5.1. 回答1: asyncio.AbstractEventLoopPolicy.new_event_loop documentation says: If there’s need to set this loop as the event loop for the current context, set

问题 Requirement: User scans multiple job numbers, for each job number , I need to call one API and get the total job details and show it in a table below the scanned text box. User don't want to wait until API call finishes. He will scan continuously irrespective of details came or not. What I have done: I have taken one variable jobNumberList which stores all the job numbers the user scanned I am continuously calling the API, with those job numbers. When API, gives response , then I am adding to

问题 Does anyone know of an event loop library (or bindings) available for Python 3? It's okay if it only does UNIX systems, though I would prefer something that does Windows as well. ETA : I realize that it is not terribly difficult to write an event loop system. However, I don't want to reinvent the wheel (we are still encouraging not doing so these days, right? ;-)) This is planned for a server application, so obviously I'd want something that isn't tied to a GUI widget toolkit or something. If

问题 I keep hearing V8 has its rudimentary event loop implementation but couldn't find it doesn't really make sense to me. Methinks, the simplest design of a JS engine would be to simply run synchronously and let the "embedder" write their own event loop - like nodejs got libuv. Is there an event loop implementation in v8? If so, could you point me at it? 回答1: Your intuition is right that the event loop is something that embedders should have control over. However, it is also a fundamental

问题 The following figure is taken from Chapter 3 of the book Secrets of the JavaScript Ninja by Jon Resig. Here the author is explaining the browser event loop. The book has to say this : It’s important to note that the browser mechanism that puts the events onto the queue is external to this event loop model. The processing necessary to determine when events have occurred and to push them onto the event queue doesn’t participate in the thread that’s handling the events. So my question is it

问题 My code is below: import msvcrt while True: if msvcrt.getch() == 'q': print "Q was pressed" elif msvcrt.getch() == 'x': sys.exit() else: print "Key Pressed:" + str(msvcrt.getch() This code is based on this question; I was using it to acquaint myself with getch . I've noticed that it takes 3 pressing the key 3 times to output the text once. Why is this? I'm trying to use it as an event loop, and that's too much of a lag... Even if I type 3 different keys, it only outputs the 3rd keypress. How

问题 I would like to start a blocking function in an Executor using the asyncio call loop.run_in_executor and then cancel it later, but that doesn't seem to be working for me. Here is the code: import asyncio import time from concurrent.futures import ThreadPoolExecutor def blocking_func(seconds_to_block): for i in range(seconds_to_block): print('blocking {}/{}'.format(i, seconds_to_block)) time.sleep(1) print('done blocking {}'.format(seconds_to_block)) @asyncio.coroutine def non_blocking_func

问题 Is there an ANSI-C compatible event loop, like libev or libevent? My requirement is to compile with -ansi flag. Thank you. 回答1: You cannot have any strictly ANSI compatible event loop on Linux, because the purpose of an event loop is to multiplex cleverly several inputs; on Linux to do that multiplexing, you have to call some syscalls like poll(2), pselect(2) or friends, and all these syscalls are not standardized in ANSI C (or ISO C99, or ISO C2011), but just in Posix. 来源： https:/

问题 Does anyone know how to make an event loop in c++ without a library? It doesn't have to be cross-platform, I'm on a Mac. Basically, I want the program to run and do nothing until the user presses the up arrow key, then the program will output "You pressed up" or something. All i can think of is having an infinite while or for loop and get input with cin , but I don't think cin can detect arrow keys and I believe it pauses the program until it reaches a '\n'; I would want it to look like this:

问题 I am writing a node app with various communities and within those communities users are able to create and join rooms/lobbies. I have written the logic for these lobbies into the node app itself though a collection of lobby objects. Lobbies require some maintenance once created. Users can change various statuses within the lobby and I also have calls using socket.io at regular intervals(about every 2 seconds) for each lobby to keep track of some user input "live". None of the tasks are too