nonblocking

问题 Python 2.7.3 x64 wxPython 2.8 x64 Been reading quite a bit on python threading and multiprocessing, particularly some articles by Doug Hellmann, which have helped tremendously. However, I'm confused about one thing... I thought the Python multiprocessing module was more-or-less a drop-in replacement for the threading module, excepting that args must be picklable, but I'm finding that in order not to block my GUI, I must first create a new thread with threading.Thread then multiprocess within

问题 I'm accepting a connection from a client and then passing that connected socket off to another object, however, that socket needs to be non-blocking. I'm trying to use getChannel().configureBlocking(false) but that does not seem to be working. It needs to be non-blocking because this the method below is called every 100ms. Is there some other way that I should be making this non-blocking? Thanks for any help! public void checkForClients() { DataOutputStream out; DataInputStream in; Socket

问题 I'm using RXTX to read data from a serial port. The reading is done within a thread spawned in the following manner: CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(port); CommPort comm = portIdentifier.open("Whatever", 2000); SerialPort serial = (SerialPort)comm; ...settings Thread t = new Thread(new SerialReader(serial.getInputStream())); t.start(); The SerialReader class implements Runnable and just loops indefinitely, reading from the port and constructing the

问题 Tornado advertises itself as "a relatively simple, non-blocking web server framework" and was designed to solve the C10k problem. However, looking at their database wrapper, which wraps MySQLdb, I came across the following piece of code: def _execute(self, cursor, query, parameters): try: return cursor.execute(query, parameters) except OperationalError: logging.error("Error connecting to MySQL on %s", self.host) self.close() raise As far as I know calls to the MySQLdb, which is built on top

问题 I am writing a server-client application. I have a server that holds several sockets that I have got from the accept() method of ServerSocket. I want to read from these sockets but I don't necesserally know which socket is ready to be read from. I need some kind of selector that will select one of the sockets that are ready to be read from, so I can read the data it sends. Thanks. 回答1: You have basically two options to make it work: Have dedicated thread per accepted socket. This is because

问题 I'm working on a program which will be taking in user input from the console as well as printfing out in a separate thread. I want to avoid situations where the user is halfway through typing something in and a printf comes along and prints itself at the cursor. Is there a way to do non-blocking io in c from the console window? Ideally, capturing keypresses or something like that such that what the user types doesn't appear on the screen. I'm developing in Ubuntu, and it's best if I don't

问题 In Redis 4.0, there is a new command UNLINK to delete the keys in Redis memory. This command is very similar to DEL: it removes the specified keys. Just like DEL a key is ignored if it does not exist. However the command performs the actual memory reclaiming in a different thread , so it is not blocking, while DEL is . This is where the command name comes from: the command just unlinks the keys from the keyspace. The actual removal will happen later asynchronously. So one can always (100%

问题 I'm writing a program that reads in a loop from the stdin, using the function fgets, as follows: while(fgets(buffer2, BUFFERSIZE , stdin) != NULL){ //Some code } I want my code to be non-blocking, that is: I don't want the program to hold on the 'fgets' line when there's no input at the moment from the user. How can i do it? 回答1: fgets() is a blocking function, it is meant to wait until data is available. If you want to perform asynchronous I/O, you can use select() , poll() , or epoll() .

问题 Our analytic server is written in c++. It basically queries underlying storage engine and returns a fairly big structured data via thrift. A typical requests will take about 0.05 to 0.6 seconds to finish depends on the request size. I noticed that there are a few options in terms of which Thrift server we can use in the c++ code, specifically TNonblockingServer, TThreadedServer, and TThreadPoolServer. It seems like TNonblockingServer is the way to go since it can support much more concurrent

问题 I want to write to a named pipe (already created) without blocking on the reader. My reader is another application that may go down. If the reader does go down, I want the writer application to keep writing to that named pipe. Something like a this in Java fopen(fPath, O_NONBLOCK) So that when the reader comes up, it may resume from where it failed. 回答1: First I try to answer your questions. Next I will try to show you a code snippet I created that solves your problem using blocking IO. Your