nonblocking

问题 I will soon be using a server named Undertow. The website says: Undertow is a flexible performant web server written in java, providing both blocking and non-blocking API’s based on NIO If Undertow allows non-blocking, is that the same as node.js? I don't mean the languages or anything like that. I have a separate project where I thought node.js would have been a good choice, but if I can use a single product for multiple projects it would be helpful. EDIT: I found this question. Java NIO non

问题 I read document abount edge triggered epoll function in web as follows: 1. The file descriptor that represents the read side of a pipe (rfd) is registered on the epoll instance. 2. A pipe writer writes 2 kB of data on the write side of the pipe. 3. A call to epoll_wait(2) is done that will return rfd as a ready file descriptor. 4. The pipe reader reads 1 kB of data from rfd. 5. A call to epoll_wait(2) is done. ....... ....... The suggested way to use epoll as an edge-triggered (EPOLLET)

问题 Is there a way to find out how many bytes of data is available on an TCPSocket in Ruby? I.e. how many bytes can be ready without blocking? 回答1: The standard library io/wait might be useful here. Requring it gives stream-based I/O (sockets and pipes) some new methods, among which is ready? . According to the documentation, ready? returns non-nil if there are bytes available without blocking. It just so happens that the non-nil value it returns it the number of bytes that are available in MRI .

问题 Is there a way to find out how many bytes of data is available on an TCPSocket in Ruby? I.e. how many bytes can be ready without blocking? 回答1: The standard library io/wait might be useful here. Requring it gives stream-based I/O (sockets and pipes) some new methods, among which is ready? . According to the documentation, ready? returns non-nil if there are bytes available without blocking. It just so happens that the non-nil value it returns it the number of bytes that are available in MRI .

问题 Here's some code that illustrates my problem: def blocking1(): while True: yield 'first blocking function example' def blocking2(): while True: yield 'second blocking function example' for i in blocking1(): print 'this will be shown' for i in blocking2(): print 'this will not be shown' I have two functions which contain while True loops. These will yield data which I will then log somewhere (most likely, to an sqlite database). I've been playing around with threading and have gotten it

问题 I see a lot of synchronous functions in the file system library. such as fs.readFileSync(filename, [options]) . How (and why) are these functions implemented if node has async/non-blocking IO and no sleep method - and can I use the same mechanism to implement other synchronous functions? 回答1: fs.readFileSync() is really just a wrapper for the fs.readSync() function. So the question is how is fs.readSync() implemented compared to fs.read(). If you look at the implementations of these two

问题 I wonder about the behaviour of socket on blocking and nonblocking actions. What happens to threads blocking on socket when the socket blocking mode changes ? Here is the scenario; thread1(T1) creates a UDP socket and fd = socket(AF_INET , SOCK_DGRAM, 0); T1 waiting(sleeping) for receive recv(fd, buf , sizeof(buf) , 0); and thread2(T2) changes socket mode to non-blocking before socket receive any data fcntl(fd, F_SETFL, O_NONBLOCK); what happens to T1 ? Is it signalled/waked because the

问题 Can someone explain/ redirect me, what is the difference between Node.js's async model(non blocking thread) vs any other language for example c#'s asynchronous way of handling the I/O. This looks to me that both are same model. Kindly suggest. 回答1: Both models are very similar. There are two primary differences, one of which is going away soon (for some definition of "soon"). One difference is that Node.js is asynchronously single-threaded, while ASP.NET is asynchronously multi-threaded. This

问题 As suggested here I would like to do that inside the selector loop. What I would really want is to read contents written to system out inside my selector loop. EDIT1: I coded a complete solution just to find out that you CANNOT redirect GC logs by using System.setOut. It simply goes straight to the FD or something. Show stopper! Unless I redirect to a file and pipe this file into my selector. Lots of work! See here. 回答1: One way to do it would be as follows: create a subclass of OutputStream

问题 I believe I have done everything correctly. I create a pipe, pass the sink to a writer thread, register the source on my selector with OP_READ, start my selector. Everything works but as soon as I write something to the sink I get a broken pipe exception. Why !!!??? There is no broken pipe here. I am frustrated. How can I debug / understand what is happening here? Does anyone have a simple pipe example that I can run to test if this is working. A thread writing on the sink and the selector