nonblocking | 易学教程

Simplest way to do a fire and forget method in C#?

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问题 I saw in WCF they have the [OperationContract(IsOneWay = true)] attribute. But WCF seems kind of slow and heavy just to do create a nonblocking function. Ideally there would be something like static void nonblocking MethodFoo(){} , but I don\'t think that exists. What is the quickest way to create a nonblocking method call in C#? E.g. class Foo { static void Main() { FireAway(); //No callback, just go away Console.WriteLine(\"Happens immediately\"); } static void FireAway() { System.Threading

Linux Blocking vs. non Blocking Serial Read

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问题 i have this code for reading from Serial in Linux , but i don\'t know what is the difference between blocking and non blocking in reading Serial Port and which one is better in which situation? 回答1: The code you mention is IMO poorly coded and commented. That code does not conform to POSIX practices for portability as described in Setting Terminal Modes Properly and Serial Programming Guide for POSIX Operating Systems. That code does not mention that it uses non-canonical (aka raw) mode, and

C non-blocking keyboard input

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问题 I\'m trying to write a program in C (on Linux) that loops until the user presses a key, but shouldn\'t require a keypress to continue each loop. Is there a simple way to do this? I figure I could possibly do it with select() but that seems like a lot of work. Alternatively, is there a way to catch a ctrl - c keypress to do cleanup before the program closes instead of non-blocking io? 回答1: As already stated, you can use sigaction to trap ctrl-c, or select to trap any standard input. Note

Non-blocking read on a subprocess.PIPE in python

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问题 I\'m using the subprocess module to start a subprocess and connect to it\'s output stream (stdout). I want to be able to execute non-blocking reads on its stdout. Is there a way to make .readline non-blocking or to check if there is data on the stream before I invoke .readline ? I\'d like this to be portable or at least work under Windows and Linux. here is how I do it for now (It\'s blocking on the .readline if no data is avaible): p = subprocess.Popen(\'myprogram.exe\', stdout = subprocess

Polling the keyboard (detect a keypress) in python

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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, portability to Linux wouldn't be bad, though it's not required. S.Lott The standard approach is to use