nonblocking | 易学教程

How to make non-blocking javascript code?

阅读更多关于 How to make non-blocking javascript code?

问题 How can I make a simple, non-block Javascript function call? For example: //begin the program console.log('begin'); nonBlockingIncrement(10000000); console.log('do more stuff'); //define the slow function; this would normally be a server call function nonBlockingIncrement(n){ var i=0; while(i<n){ i++; } console.log('0 incremented to '+i); } outputs "beginPage" "0 incremented to 10000000" "do more stuff" How can I form this simple loop to execute asynchronously and output the results via a

What does Python's socket.recv() return for non-blocking sockets if no data is received until a timeout occurs?

阅读更多关于 What does Python's socket.recv() return for non-blocking sockets if no data is received until a timeout occurs?

Basically, I've read in several places that socket.recv() will return whatever it can read, or an empty string signalling that the other side has shut down (the official docs don't even mention what it returns when the connection is shut down... great!). This is all fine and dandy for blocking sockets, since we know that recv() only returns when there actually is something to receive, so when it returns an empty string, it MUST mean the other side has closed the connection, right? Okay, fine, but what happens when my socket is non-blocking?? I have searched a bit (maybe not enough, who knows?)

How can I execute a node.js module as a child process of a node.js program?

阅读更多关于 How can I execute a node.js module as a child process of a node.js program?

问题 Here's my problem. I implemented a small script that does some heavy calculation, as a node.js module. So, if I type "node myModule.js", it calculates for a second, then returns a value. Now, I want to use that module from my main Node.JS program. I could just put all the calculation in a "doSomeCalculation" function then do: var myModule = require("./myModule"); myModule.doSomeCalculation(); But that would be blocking, thus it'd be bad. I'd like to use it in a non-blocking way, like DB calls

Non-Blocking read from standard I/O in C# [closed]

阅读更多关于 Non-Blocking read from standard I/O in C# [closed]

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 8 years ago . I want a non-blocking read function from console. How do I write that in C#? 回答1: var buf=new byte[2048]; var inputStream=Console.OpenStandardInput(); //dispose me when you're done inputStream.BeginRead(buf,0,buf

Python socket.accept nonblocking?

阅读更多关于 Python socket.accept nonblocking?

问题 Is there a way I can use python\'s socket.accept() in a non-blocking way that simply runs it and lets me just check if it got any new connections? I really don\'t want to use threading. Thanks. 回答1: You probably want something like select.select() (see documentation). You supply select() with three lists of sockets: sockets you want to monitor for readability, writability, and error states. The server socket will be readable when a new client is waiting. The select() function will block until

How do you do non-blocking console I/O on Linux in C?

阅读更多关于 How do you do non-blocking console I/O on Linux in C?

How do you do nonblocking console IO on Linux/OS X in C? Charlie Martin You don't, really. The TTY (console) is a pretty limited device, and you pretty much don't do non-blocking I/O. What you do when you see something that looks like non-blocking I/O, say in a curses/ncurses application, is called raw I/O . In raw I/O, there's no interpretation of the characters, no erase processing etc. Instead, you need to write your own code that checks for data while doing other things. In modern C programs, you can simplify this another way, by putting the console I/O into a thread or lightweight process

Non-blocking console input C++

阅读更多关于 Non-blocking console input C++

问题 I\'m looking for a (multiplatform) way to do non-blocking console input for my C++ program, so I can handle user commands while the program continually runs. The program will also be outputting information at the same time. What\'s the best/easiest way to do this? I have no problem using external libraries like boost, as long as they use a permissive license. 回答1: I would do this by creating separate a thread which calls normal blocking IO functions and pass it a callback function which it

What is non-blocking or asynchronous I/O in Node.js?

阅读更多关于 What is non-blocking or asynchronous I/O in Node.js?

问题 In the context of Server Side Javascript engines, what is non-blocking I/O or asynchronous I/O? I see this being mentioned as an advantage over Java server side implementations. 回答1: Synchronous vs Asynchronous Synchronous execution usually refers to code executing in sequence. Asynchronous execution refers to execution that doesn't run in the sequence it appears in the code. In the following example, the synchronous operation causes the alerts to fire in sequence. In the async operation,

Is asynchronous jdbc call possible?

阅读更多关于 Is asynchronous jdbc call possible?

问题 I wonder if there is a way to make asynchronous calls to a database? For instance, imagine that I\'ve a big request that take a very long time to process, I want to send the request and receive a notification when the request will return a value (by passing a Listener/callback or something). I don\'t want to block waiting for the database to answer. I don\'t consider that using a pool of threads is a solution because it doesn\'t scale, in the case of heavy concurrent requests this will spawn

Polling the keyboard (detect a keypress) in python

阅读更多关于 Polling the keyboard (detect a keypress) in python

问题 How can I poll the keyboard from a console python app? Specifically, I would like to do something akin to this in the midst of a lot of other I/O activities (socket selects, serial port access, etc.): while 1: # doing amazing pythonic embedded stuff # ... # periodically do a non-blocking check to see if # we are being told to do something else x = keyboard.read(1000, timeout = 0) if len(x): # ok, some key got pressed # do something What is the correct pythonic way to do this on Windows? Also,