nonblocking

问题 I've read that wait-free causes all threads to finish independently and lock-free ensures the program as a whole completes. I couldn't quite get it. Can anyone give an example (java) illustrating this. EDIT: Does lock-free mean a program without deadlock? 回答1: If a program is lock-free, it basically means that at least one of its threads is guaranteed to make progress over an arbitrary period of time. If a program deadlocks, none of its threads (and therefore the program as a whole) cannot

问题 I am trying to write a non-blocking api with tornado. But when I try it on local the first request is blocking the API. I tried to use different browsers but the result is same. I opened chrome and firefox. On chrome I go http://localhost:8888/test-first and while it is loading I immediatly go http://localhost:8888/test-second from firefox. I am expecting the request from firefox would be answered while the other one is still loading. But both of them are waiting and when the first request is

问题 I am trying to write a non-blocking api with tornado. But when I try it on local the first request is blocking the API. I tried to use different browsers but the result is same. I opened chrome and firefox. On chrome I go http://localhost:8888/test-first and while it is loading I immediatly go http://localhost:8888/test-second from firefox. I am expecting the request from firefox would be answered while the other one is still loading. But both of them are waiting and when the first request is

问题 Is there a way to implement non-blocking / asynchronous execution (without fork()'ing) in Perl? I used to be a Python developer for many years... Python has really great 'Twisted' framework that allows to do so (using DEFERREDs. When I ran search to see if there is anything in Perl to do the same, I came across POE framework - which seemed "close" enough to what I was searching for. But... after spending some time reading the documentation and "playing" with the code, I came against "the wall

问题 Need help with Klein API for Non-blocking. This is a simple test app: # -*- coding: utf-8 -*- import datetime import json import time from klein import Klein app = Klein() async def delay(seconds): """Set some delay for test""" time.sleep(seconds) return "Works" @app.route('/', branch=True) async def main(request): some_data = await delay(5) return json.dumps([{ "status": "200", "time": datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"), "data": some_data }]) app.run("localhost", 8080)

问题 I'm currently writing an async i/o library for Java that has a very similar API to Node.js. I could do the socket part with nio, but there seems to be no FileChannel that extends SelectableChannel so I can't do the file i/o with nio, too. In Java 7 they added AnsynchronousFileChannel, which allows non-blocking file i/o. Unfortunately, Android does not support it. Is there an equivalent class on Android to do non-blocking file io? You can find the library here: https://github.com/VanCoding

问题 I would like to ask how tornado.concurrent.run_on_executor (later just run_on_executor ) works, because I probably do not understand how to run synchronous task to not block the main IOLoop. All the examples using run_on_executor , which I found, are using just time to block the loop. With time module it works fine, but when I try some time intesive calculations, using run_on_executor , the task blocks the IOLoop. I am able to see that the app uses multiple threads, but it is still blocking.

问题 Description : I have written a custom log handler for capturing log events and writing them to a QTextBrowser object (working sample code shown below). Issue : Pressing the button invokes someProcess() . This writes two strings to the logger object. However, the strings only appear after someProcess() returns. Question : How do I get the logged strings to appear in the QTextBrowser object immediately/in real-time? (i.e. as soon as a logger output method is invoked) from PyQt4 import QtCore,

问题 I have an OpenSSL server that has echo functionality as described here and a client as described here. I made some minor changes to the server (e.g. changing the certifiacte and private key paths, adding some more debug outputs,...) and in the client I just removed the "BIO* out" and printed the BIO_read result to the console instead. Also both client and server use TLSv1_1_client_method and TLSv1_1_server_method respectively. The codes work fine together, but if I add "BIO_set_nbio(web, 1);"

问题 I learned that in Node.js you yield in between long computations to prevent the server from blocking. How do you achieve this on Meteor? Are there techniques for also doing this on the client? I am new to web development, simple examples would be appreciated. 回答1: Meteor uses Fibers which behave a little different than usual Node.js code. I believe there's no need to yield manually. Instead, you may want to use this.ublock() method on the server side – see this awesome article that explains