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POCompute data from multiple clients simultaneously
 

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    <p>I'm trying to write a server able to handle multiple (more than a thousand) client connections concurrently in C language. Every connection is meant to accomplish three things: </p> <ol> <li>Send data to the server</li> <li>The server processes the data</li> <li>The server returns data to the client</li> </ol> <p>I am using non-blocking sockets and epoll() for handling all the connections, but my problem is right in the moment after the server receives the data from one client and has to call a function which spends several seconds in processing the data before it returns the result that has to be sent back to the client before closing the connection.</p> <p>My <strong>question</strong> is, what paradigm can I use in order to be able to keep handling more connections while the data of one client "is cooking"?</p> <p>I've been researching a bit about the possibilities of doing it by <strong>creating a thread or a process every time</strong> I need to call the computing function, but I'm not sure if this would be possible given the number of possible concurrent connections, that's why I came here expecting that someone more experienced that me in the matter could shed some light on my ignorance.</p> <hr> <p><strong>Code snippet:</strong></p> <pre><code>while (1) { ssize_t count; char buf[512]; count = read (events[i].data.fd, buf, sizeof buf); // read the data if (count == -1) { /* If errno == EAGAIN, that means we have read all data. So go back to the main loop. */ if (errno != EAGAIN) { perror ("read"); done = 1; } /* Here is where I should call the processing function before exiting the loop and closing the actual connection */ answer = proc_function(buf); count = write (events[i].data.fd, answer, sizeof answer); // send the answer to the client break; } ... </code></pre> <p>Thanks in advance.</p>
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