race-condition

问题 I have a registration page that receives tokens ad parse them and login the user if the parameters apply. Between the time that i checked the token, to the time that i removed the token from the db, another user can use the same token to login. is there a way to make sure that specific range of lines of code will be executed with not interference, so i won't have race condition problem ? thanks update I have two servers. apache tomcat 6 red5 v0.9 (free java based flash media streaming and

问题 According to Persistent Login Cookie Best Practice, you should never allow a "remember me" token to be used more than once: A persistent cookie is good for a single login. When authentication is confirmed, the random number used to log in is invalidated and a brand new cookie assigned. Standard session-management handles the credentials for the life of the session, so the newly assigned cookie will not be checked until the next session (at which point it, too, will be invalidated after use).

问题 The JavaFX docs state that a WebView is ready when Worker.State.SUCCEEDED is reached however, unless you wait a while (i.e. Animation , Transition , PauseTransition , etc.), a blank page is rendered. This suggests that there is an event which occurs inside the WebView readying it for a capture, but what is it? There's over 7,000 code snippets on GitHub which use SwingFXUtils.fromFXImage but most of them appear to be either unrelated to WebView , are interactive (human masks the race condition

问题 I was wondering whether it's easy to make a race condition using MRI ruby(2.0.0) and some global variables, but as it turns out it's not that easy. It looks like it should fail at some point, but it doesn't and I've been running it for 10 minutes. This is the code I've been trying to achieve it: def inc(*) a = $x a += 1 a *= 3000 a /= 3000 $x = a end THREADS = 10 COUNT = 5000 loop do $x = 1 THREADS.times.map do Thread.new { COUNT.times(&method(:inc)) } end.each(&:join) break puts "woo hoo!"

问题 I have a server accepting clients that has a stop() method that closes the server down, which is causing a java.nio.AsynchronousCloseException that I'd like to resolve. The stop() method is called on a different thread, which is what is causing the race condition I believe. Here is my code: public void run() { InetSocketAddress addr = new InetSocketAddress(provider.getConnection(), 12354); try { server = ServerSocketChannel.open(); server.configureBlocking(true); server.socket().bind(addr);

问题 In the following C code I am using OpenMP in a nested loop. Since race condition occurs, I want to perform atomic operations at the end: double mysumallatomic() { double S2 = 0.; #pragma omp parallel for shared(S2) for(int a=0; a<128; a++){ for(int b=0; b<128;b++){ double myterm = (double)a*b; #pragma omp atomic S2 += myterm; } } return S2; } The thing is that #pragma omp atomic has no effect on the program behaviour, even if I remove it, nothing happens. Even if I change it to #pragma oh_my

问题 In the following C code I am using OpenMP in a nested loop. Since race condition occurs, I want to perform atomic operations at the end: double mysumallatomic() { double S2 = 0.; #pragma omp parallel for shared(S2) for(int a=0; a<128; a++){ for(int b=0; b<128;b++){ double myterm = (double)a*b; #pragma omp atomic S2 += myterm; } } return S2; } The thing is that #pragma omp atomic has no effect on the program behaviour, even if I remove it, nothing happens. Even if I change it to #pragma oh_my

问题 I would like to safely be able to simulate open with O_CREAT | O_WRONLY | O_TRUNC | O_NOFOLLOW and O_CREAT | O_WRONLY | O_APPEND | O_NOFOLLOW on systems that do not support O_NOFOLLOW . I can somewhat achieve what I am asking for with: struct stat lst; if (lstat(filename, &lst) != -1 && S_ISLNK(lst.st_mode)) { errno = ELOOP; return -1; } mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH; int fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC | O_NOFOLLOW, mode); but then I

问题 I debug Go programs in Visual Studio Code. How can I add the -race argument in launch.json file? I add config in launch.json like below, but it doesn't work. "args": ["-race"] 来源： https://stackoverflow.com/questions/54210354/how-to-add-race-argument-in-launch-json-file

问题 1. i posted the question(About thread-safety of weak_ptr) several days ago,and I have the other related question now. If i do something like this,will introduce a race condition as g_w in above example ?(my platform is ms vs2013) std::weak_ptr<int> g_w; void f3() { std::shared_ptr<int>l_s3 = g_w.lock(); //2. here will read g_w if (l_s3) { ;/..... } } void f4() //f4 run in main thread { std::shared_ptr<int> p_s = std::make_shared<int>(1); g_w = p_s; std::thread th(f3); // f3 run in the other