The approach I take is to use an ExecutorService to manage pools of threads. ExecutorService es = Executors.newCachedThreadPool(); for(int i=0;i<5;i++) es.execute(new Runnable() { /* your task */ }); es.shutdown(); boolean finished = es.awaitTermination(1, TimeUnit.MINUTES); // all tasks have finished or the time has been reached.
You need to be in a synchronized block in order for Object.wait() to work. Also, I recommend looking at the concurrency packages instead of the old school threading packages. They are safer and way easier to work with. EDIT I assumed you meant Object.wait() as your exception is what happens when you try to gain … Read more
In Python 3 use input(): input(“Press Enter to continue…”) In Python 2 use raw_input(): raw_input(“Press Enter to continue…”) This only waits for the user to press enter though. One might want to use msvcrt ((Windows/DOS only) The msvcrt module gives you access to a number of functions in the Microsoft Visual C/C++ Runtime Library (MSVCRT)): … Read more
If you want to pause then use java.util.concurrent.TimeUnit: TimeUnit.SECONDS.sleep(1); To sleep for one second or TimeUnit.MINUTES.sleep(1); To sleep for a minute. As this is a loop, this presents an inherent problem – drift. Every time you run code and then sleep you will be drifting a little bit from running, say, every second. If this … Read more
What is the potential damage if it was possible to invoke wait() outside a synchronized block, retaining it’s semantics – suspending the caller thread? Let’s illustrate what issues we would run into if wait() could be called outside of a synchronized block with a concrete example. Suppose we were to implement a blocking queue (I … Read more
I intend to remove all of the labels together when all of the workers have completed their tasks. As described here, a CountDownLatch works well in this context. In the example below, each worker invokes latch.countDown() on completion, and a Supervisor worker blocks on latch.await() until all tasks complete. For demonstration purposes, the Supervisor updates … Read more
[*] wait also (optionally) takes the PID of the process to wait for, and with $! you get the PID of the last command launched in the background. Modify the loop to store the PID of each spawned sub-process into an array, and then loop again waiting on each PID. # run processes and store … Read more
There are many ways to wait in Unity. They are really simple but I think it’s worth covering most ways to do it: 1.With a coroutine and WaitForSeconds. This is by far the simplest way. Put all the code that you need to wait for some time in a coroutine function then you can wait … Read more
You could do this easily in two ways: Pass a ‘print token’ between the threads using two semaphores: thread 1 prints, signals semaphore A, waits on semaphore B then loops. Thread 2 waits on semaphore A, prints, signals semaphore B and loops. Write in-line, single-threaded code.
Outside of ReadLine which you are already using that waits for user input, Thread.Sleep as in below is one basic method of stopping the application for X amount of time to wait for an execution to finish or a user to be ready. Thread.Sleep blocks execution though in more complex applications: Thread.Sleep(2000); Getting into an … Read more