wait

问题 If i use wait(null) , and i know (for sure) that the child will finish (exit) before we reach to wait(null) in the parent process , does the wait(null) block the parent process ?? I mean , the wait() won't get any signal right ? int main() { int pipe_descs[2] ; int i, n, p ; srand(time(NULL( ; pipe(pipe_descs) ; for (i = 0; i < 2; i++) { pid_t status = fork() ; if (status == 0) { n = rand() % 100; p = (int) getpid() ; write(pipe_descs[1], &n, sizeof(int)) ; write(pipe_descs[1], &p, sizeof(int

问题 If i use wait(null) , and i know (for sure) that the child will finish (exit) before we reach to wait(null) in the parent process , does the wait(null) block the parent process ?? I mean , the wait() won't get any signal right ? int main() { int pipe_descs[2] ; int i, n, p ; srand(time(NULL( ; pipe(pipe_descs) ; for (i = 0; i < 2; i++) { pid_t status = fork() ; if (status == 0) { n = rand() % 100; p = (int) getpid() ; write(pipe_descs[1], &n, sizeof(int)) ; write(pipe_descs[1], &p, sizeof(int

来源： https://stackoverflow.com/questions/27680977/wait-for-multiple-processes-to-complete

来源： https://stackoverflow.com/questions/27680977/wait-for-multiple-processes-to-complete

来源： https://stackoverflow.com/questions/63900887/implementing-wait-and-notify-between-multiple-sensor-connections

问题 I'm creating a quiz app where randomly generating tasks, but I don't know how to wait for user click in for loop. I tried to do this: final Integer min=1; final Integer max=100; for (int i = 0; i<5; i++){ button_check3.setVisibility(View.VISIBLE); button_next3.setVisibility(View.INVISIBLE); final int x = new Random().nextInt(max - min)+min; final int y = new Random().nextInt(max-x - min)+min; task3.setText(x + " + " + y + " ="); //set task final int zbroj = x+y; button_check3

问题 I'm having this problem for some time ow and I can't seem to find a solution. I'm using the latest html2canvas js plugin to take a screenshot of chart made with flotcharts and then submit the base64 screenshot via a hidden input. The problem is the div with the chart also has some images and html2canvas return a base64 string before the images are loaded. I can put a setTimeout on the submit untill they are loaded but apparently chrome opens the page where I submitted as a popup (which is

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Div as modal - javascript Is there a way to somehow lock a page in Javascript until a function call is complete? What I have in mind is like a semi-transparent grey cover that prevents any other user actions such as mouse-overs or button clicks until the current request is done processing. The look-and-feel doesn't matter quite as much as the functionality, though. I haven't been able to find anything that does

问题 I'm currently having a PowerPoint presentation that's being used on a computer as some sort of kiosk or information screen. It reads it's text from a text file on the disk. The text in this text file is displayed in a textbox in PowerPoint and this is being refresh every 5 seconds. This way we can edit the text in the PowerPoint without editing the PowerPoint presentation itself so it will continue to run. Work great so far, only PowerPoint VBA does not contain the Application.Wait function.