wait

问题 synchronized (Foo.class) { while (someCondition) { try { Foo.class.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } } It seems that this thread both wakes when some other thread call interrupt() or notify() on this thread. Are there any differences between the two? --EDIT-- I know one is for notifying an object, the other interrupts a thread. But both of these lead to the same consequence, that is, this thread is waken up, so what I want to ask is how these 2 situations'

问题 I have this issue with a method in C#. I made a method that calls a function from a dll its called Phone.GetLampMode(); Now Phone.GetLampMode doesnt return anything. The data gets returned in a event the ' onGetLampModeResponse ' event. Is there a way i can wait in my method until i get the data from the onGetLampModeResponse event? public bool checkLamp(int iLamp) { Phone.ButtonIDConstants btn = new Phone.ButtonIDConstants(); btn = Phone.ButtonIDConstants.BUTTON_1; btn += iLamp; Phone

问题 Before a thread can wait on an object, it has to acquire a monitor on that object. The monitor is then released, and the thread attempts to re-acquired it once it awakes. But what happens to other monitors the thread holds when it calls wait ? Consider this example: Object a = // ... Object b = // ... synchronized(a) { synchronized(b) { b.wait(); // continue } } When the thread calls b.wait() , will it release the locks on both a and b , or only b ? 回答1: Only b . The authoritarian source for

问题 The misunderstanding happens when implicit wait is less than explicit: var timeOut = 5000; var search = element(by.xpath(`//*[@name='qwer']`)); browser.manage().timeouts().implicitlyWait(4000); browser.ignoreSynchronization = true; describe('Protractor Test', function () { beforeEach(function () { browser.get('https://www.google.com.ua'); }); it('EC', function () { console.log('START'); // browser.sleep(timeOut); browser.wait(protractor.ExpectedConditions.presenceOf(search), timeOut); }); });

问题 I have seen a question on why "polling is bad". In terms of minimizing the amount of processor time used by one thread, would it be better to do a spin wait (i.e. poll for a required change in a while loop) or wait on a kernel object (e.g. a kernel event object in windows)? For context, assume that the code would be required to run on any type of processor, single core, hyperthreaded, multicore, etc. Also assume that a thread that would poll or wait can't continue until the polling result is

问题 Hy! So I'm starting with netbeans java gui development and I have run into this problem: I have made a window with a button and a text field. When the user clicks the button I want the text field to start typing itself with a delay. So for example: textfield.text=h wait(1) sec textfield.text=he wait(1) sec textfield.text=hel wait(1) sec textfield.text=hell wait(1) sec textfield.text=hello I have already tried with Thread.sleep() , but in the example above it waits 4 seconds or so and after

问题 I fork() into process X and Y, afterwards Y forks() again into itself and process Z multiple times. Now process Y is some kind of "listener" and I would like X to be the deleter. The Z processes perform the actual actions. Z processes are grandchildren of X. With a FIFO and some signaling, X has produced a list of all pids of the Z processes. The problem now is that I would like to delete Z process zombies with X (going through the list of pids). I've tried it with waitpid() , but of course

问题 I've got a program that is forking to a child to do some work, but I am only doing one child at a time at this time. I am using wait() to wait for the child to finish, do I need to do anything with SIGCHLD as well (such as disable the handler)? In my situation I am getting a value of EINTR in errno which leads me to think that I need to mask SIGCHLD . In broad strokes, this is the program: read arguments for(list of work to do) fork() if child, execlp() to work program if parent, wait() for

问题 I want to know the status of a process. I think I can use the wait family functions but actually I don't want to wait for the process, just check the status and go on. I would want something like checkStatusOfProcess(&status); if(status == WORKING) { //do something } else if(status == exited) { //do something else } else \\I dont care about other states 回答1: Then you want to use the waitpid function with the WNOHANG option: #include <sys/types.h> #include <sys/wait.h> int status; pid_t return

问题 my problem is the following: My pythons script receives data via sys.stdin, but it needs to wait until new data is available on sys.stdin. As described in the manpage from python, i use the following code but it totally overloads my cpu. #!/usr/bin/python -u import sys while 1: for line in sys.stdin.readlines(): do something useful Is there any good way to solve the high cpu usage? Edit: All your solutions don't work. I give you exactly my problem. You can configure the apache2 daemon that he