nonblocking

问题 I want to run a shell script in php, but this shell script takes a long time to execute (it has sleep in it), I don't want the web server to block when executing this script. I tried exec() and shell_exec() in php but the server stops until the shell script finishes! I thought of doing fork in the shell script itself but I don't know how to do that. I just want the php script to call this shell script and continue working, I'm not waiting any result from the script. I tried running the shell

问题 I believe that if we call close system call on a non-blocking socket it returns immediately, then how to handle the response? whether it is closed or not? in other words what is the behavior of the socket system call close on a non-blocking socket? 回答1: if we call close system call on a non-blocking socket it returns immediately The socket is always closed: the connection may still be writing to the peer. But your question embodies a fallacy: if you call close() on any socket it will return

问题 Node.JS biggest advantage is it's non blocking nature. It's single threaded, so it doesn't need to spawn a new thread for each new incoming connection. Behind the event-loop (which is in fact single threaded), there is a "Non blocking Worker". This thing is not single threaded anymore, so (as far as I understood) it can spawn a new thread for each task. Maybe I misunderstood something, but where exactly is the advantage. If there are to many tasks to handle, wouldn't be the Non Blocking

问题 i read this article How To Really, Truly Use QThreads; The Full Explanation, it says instead of subclass qthread, and reimplement run(), one should use moveToThread to push a QObject onto QThread instance using moveToThread(QThread*) here is the c++ example, but i don't know how to convert it to python code. class Worker : public QObject { Q_OBJECT QThread workerThread; public slots: void doWork(const QString &parameter) { // ... emit resultReady(result); } signals: void resultReady(const

问题 Similar to the problem asked a while ago on kernel 3.x, but I'm seeing it on 4.9.37. The named fifo is created with mkfifo -m 0666 . On the read side it is opened with int fd = open(FIFO_NAME, O_RDONLY | O_NONBLOCK); The resulting fd is passed into a call to select() . Everything works ok, till I run echo >> <fifo-name> . Now the fd appears in the read_fds after the select() returns. A read() on the fd will return one byte of data. So far so good. The next time when select() is called and it

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Wake up thread blocked on accept() call I am writing a small server which listening for connections (accepting them and passing them to worker threads) until a custom stop signal is sent. If I use blocking sockets, then my main accept loop cannot break on the custom stop signal being sent. However, I wish to avoid having a busy-wait/spinlock loop with a non-blocking socket. What I want is for my main accept loop

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Wake up thread blocked on accept() call I am writing a small server which listening for connections (accepting them and passing them to worker threads) until a custom stop signal is sent. If I use blocking sockets, then my main accept loop cannot break on the custom stop signal being sent. However, I wish to avoid having a busy-wait/spinlock loop with a non-blocking socket. What I want is for my main accept loop

问题 Twisted has a "non-blocking" event loop. I understand what a blocking event loop does (sort of, from the Wikipedia page) but can't figure out how a non-blocking one does. 回答1: while (true) wait_for_events handle_events Basically, non-blocking event loop utilizes device that allows for waiting for multiple events simultaneously ( select / poll on UNIX, WaitForMultipleEvents on Windows, epoll on Linux kqueue on FreeBSD etc). In each iteration of main loop, events (file descriptors, timers etc)

问题 If Javascript is a single threaded process and AJAX is asynchronous then how does it happen ? So at OS level ain't the JS engine making a Non-Blocking I/O call for Ajax ? 回答1: Yes, the browser engine is making a non-blocking I/O call for Ajax (when you do a non-blocking ajax call). There are any number of different ways the browser could implement the ajax networking. The only thing we know for sure is that the ajax i/o request isn't blocking the javascript thread. And, further every browser

问题 Is there a standard function to receive messages concurrent, but non-blocking? It seems like all the functions available in std.concurrency are blocking and the closest I found to something that is non-blocking is receiveTimeout however it still waits until the timeout. I would like it to return immediately if there are no messages passed to the thread. Here is what I came up with using receiveTimeout . module main; import std.concurrency; import std.stdio : writefln, readln; import core.time