nonblocking

问题 I'm trying to understand rational behind the statement For cases where blocking is absolutely necessary, futures can be blocked on (although it is discouraged) Idea behind ForkJoinPool is to join processes which is blocking operation, and this is main implementation of executor context for futures and actors. It should be effective for blocking joins. I wrote small benchmark and seems like old style futures(scala 2.9) are 2 times faster in this very simple scenario. @inline def futureResult[T

问题 while(1){ rl.question("Command: ",function(answer){ console.log(answer); }) } Just tried this code, but instead get input one by one, it blink the "Command: " line. I know node.js is non-blocking but i don't know how to fix this problems. 回答1: var readline = require('readline'); var log = console.log; var rl = readline.createInterface({ input: process.stdin, output: process.stdout }); var recursiveAsyncReadLine = function () { rl.question('Command: ', function (answer) { if (answer == 'exit')

问题 For example: import threading import time import Tkinter class MyThread(threading.Thread): def __init__(self): threading.Thread.__init__(self) def run(self): print "Step Two" time.sleep(20) class MyApp(Tkinter.Tk): def __init__(self): Tkinter.Tk.__init__(self) self.my_widgets() def my_widgets(self): self.grid() self.my_button = Tkinter.Button(self, text="Start my function", command=self.my_function) self.my_button.grid(row=0, column=0) def my_function(self): print "Step One" mt = MyThread()

问题 For example: import threading import time import Tkinter class MyThread(threading.Thread): def __init__(self): threading.Thread.__init__(self) def run(self): print "Step Two" time.sleep(20) class MyApp(Tkinter.Tk): def __init__(self): Tkinter.Tk.__init__(self) self.my_widgets() def my_widgets(self): self.grid() self.my_button = Tkinter.Button(self, text="Start my function", command=self.my_function) self.my_button.grid(row=0, column=0) def my_function(self): print "Step One" mt = MyThread()

问题 I have a web scraper in Scrapy that gets data items. I want to asynchronously insert them into a database as well. For example, I have a transaction that inserts some items into my db using SQLAlchemy Core: def process_item(self, item, spider): with self.connection.begin() as conn: conn.execute(insert(table1).values(item['part1']) conn.execute(insert(table2).values(item['part2']) I understand that it's possible to use SQLAlchemy Core asynchronously with Twisted with alchimia. The

问题 I was trying to understand how non-blocking sockets work ,so I wrote this simple server in python . import socket s=socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.bind(('127.0.0.1',1000)) s.listen(5) s.setblocking(0) while True: try: conn, addr = s.accept() print ('connection from',addr) data=conn.recv(100) print ('recived: ',data,len(data)) except: pass Then I tried to connect to this server from multiple instances of this client import socket s=socket.socket(socket.AF_INET, socket.SOCK

问题 I am trying to capture single keyboard inputs in a non blocking way inside a while loop using boost asio async_read. The handler is expected to display the read characters. My code: #include <boost/asio/io_service.hpp> #include <boost/asio/posix/stream_descriptor.hpp> #include <boost/asio/read.hpp> #include <boost/system/error_code.hpp> #include <iostream> #include <unistd.h> #include <termios.h> using namespace boost::asio; void read_handler(const boost::system::error_code&, std::size_t) {

来源： https://stackoverflow.com/questions/19169378/socket-select-versus-non-block-recv

来源： https://stackoverflow.com/questions/62693064/using-openssl-bios-with-non-blocking-sockets-for-dtls-1-2

问题 In the book https://pragprog.com/book/tbajs/async-javascript, I found this: Node’s early iterations used Promises in its nonblocking API. However, in February 2010, Ryan Dahl made the decision to switch to the now-familiar callback(err, results...) format, on the grounds that Promises are a higher-level construct that belongs in “userland.” It looks quite confusing to me, because as an API to read files, this fs.readFile('/etc/passwd') .onSuccess(function(data){console.log(data)}) .onError