wait

问题 I was reading this Java: notify() vs. notifyAll() all over again. xagyg has given a good example there. I just want to know if I put notify immediately before the wait like below, will it solve the problem of deadlock? Please explain. while (buf.size()==MAX_SIZE) { notify(); wait(); // called if the buffer is full (try/catch removed for brevity) } and while (buf.size()==0) { notify(); wait(); // called if the buffer is empty (try/catch removed for brevity) // X: this is where C1 tries to re

问题 This code seems to work fine so far in testing. However I am new at multithreading and want to know if this code is ideal, since I know there is a lot of "donts" regarding concurrency. Is there a better way to make an executor for queued Runnables on a single thread? This is my first time making one so I feel inclined to believe something could be better. public class ExplosionExecutor{ private static List<Runnable> queue= new ArrayList<Runnable>(); private static Thread thread= new Thread

问题 I am novice to Selenium and trying to walk through some code. It uses Explicit Wait as below functions in Utils.java file. public static void waitForElement(WebElement element){ WebDriverWait wait = new WebDriverWait(driver, 10); wait.until(ExpectedConditions.elementToBeClickable(element)); } When I compile it gives the error :- The method elementToBeClickable(By) in the type ExpectedConditions is not applicable for the arguments (WebElement) 回答1: It is very clear from the error message that

问题 I am trying to create notification system between server and client side. In my service I have something like this : IClientNotificationService service = SERVICES.getService(IClientNotificationService.class); service.putNotification(notification, new AllUserFilter(TIMEOUT)); On client side, when receive this notification, client present MessageBox with Yes No options. MessageBox.showYesNoMessage(....) What I would like to have is to be able to inform service what user select, yes or no. For

问题 I am trying to implement an asynchronous messaging mechanism (a checkpointing mechanism) using boost mpi library. In my code, receivers wait a message from the others via irecv. After the irecv, they do not call wait function. Instead, they call the test function. If test is successful, they will process the received message and start a new irecv. Else, they will advance until the checkpoint. During the checkpoint, they wait all of the in transit messages to be completed using wait function.

问题 Is it possible to find an element and then wait on a child element of that element? I do not know the full xpath, because I'm looping through a collection of elements. So lets say I find an element: IWebDriver driver = new ChromeDriver(chromeDriverPath); IWebElement firstElement = driver.FindElement(By.XPath("//table/tr[1]")); Now there's a sub element I want to find, but pretend I can't know the full xpath because I'm looping through elements: IWebElement secondElement = firstElement

问题 I have a thread class having the following two methods: public void run() { boolean running=true; while(running) { sendImage(); } } private synchronized void sendImage() { if(!imageready.getFlag()) { try { wait(); System.out.println("woke up!"); } catch(Exception e) { System.out.println("Exception raises in ImgSender while waiting"); } } else { //send image } } I also has a GUI part with a mouse click method to open the file chooser window to let user choose file. The code public void

问题 I'am new to the OpenCL. How can i make a delay in OpenCL Kernel script without making loops? I have a code that's in some circumstances needs to wait for some time and then resume execution like so __kernel void test(uint4 value,uint4 delay) { uint id = get_global_id(0); //some code for(uint i=0;i<delay;i++) { //... do nothing like this? } } But i suppose that the loop will make gpu busy as hell, is there something i can use like sleep maybe in the kernel CL? I looked up in the sdk

问题 I'm trying to start a fixed number of concurrent batch processes that have similar filenames, all in the same directory: TestMe1.bat TestMe2.bat TestMe3.bat All batches should start at the same time, and all should complete before the batch continues, e.g. a master.bat: echo Starting batches ( start "task1" cmd /C "TestMe1.bat" start "task2" cmd /C "TestMe2.bat" start "task3" cmd /C "TestMe3.bat" ) | pause echo All batches have stopped and we can safely continue I'm trying to find a way to

问题 I'm wondering if I have to wait() for all child process to finish in the parent program? I have read the manuals and some online resources about fork(), but none of them mentioned that a wait() in the parent is enforced. However, if I do not wait in the parent program, the process does not terminate but just does nothing until I press enter, and than terminates. 回答1: If the parent process doesn't use a system call of the wait() -family for its children processes, it could simply die first.