nonblocking

Im working on a socket listener that has to listen on 2 ports for 2 types of data( port 80 and port 81). These data are very similar as in the kind of operations that are performed on the data and are just different because they arrive n different ports. I went ahead and coded an implementation using Java's ServerSocket class, only to realize later that the accept() method of the ServerSocket class is block and my implementation cant afford that. So now i was thinking of implementing the same using Java NIO but after having gone through some tutorials i think i am more confused than how i

So, I've recently been injected with the Node virus which is spreading in the Programming world very fast. I am fascinated by it's "Non-Blocking IO" approach and have indeed tried out a couple of programs myself. However, I fail to understand certain concepts at the moment. I need answers in layman terms (someone coming from a Java background) 1. Multithreading & Non-Blocking IO. Let's consider a practical scenario. Say, we have a website where users can register. Below would be the code. .. .. // Read HTTP Parameters // Do some Database work // Do some file work // Return a confirmation

I am trying to implement non-blocking for socket recv and the problem is that I got an error -1 when there in no data but I expect to get EAGAIN error. Socket is set definitely to non-blocking state, I checked flags = fcntl(s, F_GETFL, 0) for O_NONBLOCK flag. Thanks a lot in advance! #include <arpa/inet.h> #include <linux/if_packet.h> #include <stdio.h> #include <string.h> #include <stdlib.h> #include <sys/ioctl.h> #include <sys/socket.h> #include <net/if.h> #include <netinet/ether.h> #include <unistd.h> #include <fcntl.h> #include <asm-generic/errno-base.h> #include <assert.h> #define ETH

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) interface is as follows: i) Use nonblocking file descriptors ii) Call epoll_wait for an event only after

I have not yet found the best solution for this. I have a non modal dialog that can be opened in unlimited instances by a hotkey in the application. Even the dialog itself can open a new instance. I want those dialogs to always be front of the main application window. I have tried a couple of things. Set FormStyle to fsStayOntop. This works but have the advantage that the dialog will be front of ALL windows even other applications. I only want it to be front of my main window. Set PopupMode to pmAuto. This also works except for the case when one dialog open another dialog. If the first dialog

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? 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 . Here's an example which creates a dumb little socket server, and then connects to it with a client. The

Lets say I want to do non blocking reads from a network socket. I can async await for the socket to read x bytes and all is fine. But how do I combine this with deserialization via protobuf? Reading objects from a stream must be blocking? that is, if the stream contains too little data for the parser, then there has to be some blocking going on behind the scenes so that the reader can fetch all the bytes it needs. I guess I can use lengthprefix delimiters and read the first bytes and then figure out how many bytes I have to fetch minimum before I parse, is this the right way to go about it? e

When running an event loop in libuv using the uv_run function, there's a "mode" parameter that is used with the following values: UV_RUN_DEFAULT UV_RUN_ONCE UV_RUN_NOWAIT The first two are obvious. UV_RUN_DEFAULT runs the event loop until there are no more events, and UV_RUN_ONCE processing a single event from the loop. However, UV_RUN_NOWAIT doesn't seem to be a separate mode, but rather a flag that can be ORed with one of the other two values. By default, this function blocks until events are done processing, and UV_RUN_NOWAIT makes it nonblocking, but any documentation I can find on it ends