multithreading

问题 Okay, so if I'm running in a child thread on linux (using pthreads if that matters), and I run the following command kill(getpid(), someSignal); it will send the given signal to the parent of the current thread. My question: Is it guaranteed that the parent will then immediately get the CPU and process the signal (killing the app if it's a SIGKILL or doing whatever else if it's some other signal) before the statement following kill() is run? Or is it possible - even probable - that whatever

问题 Okay I am trying to make a thread in c++ that runs the function storePose(); that function takes nine parameters as doubles. Every time I try to create the thread it complains about the parameters. I will post my code below. I have not a clue why this wont work. Thanks in advanced CODE: std::thread t(storePose,x_position, y_position, z_position, azimuth, att_pitch, att_roll, yaw, cam_pitch, cam_roll); t.detach(); ERROR GIVEN: 12 IntelliSense: no instance of constructor "std::thread::thread"

问题 I'm beginning to wonder if this is impossible, but I thought I'd ask in case there's a clever way to get around the problems I'm having. I have a Qt application that uses an ActiveX control. The control is held by a QAxWidget, and the QAxWidget itself is contained within another QWidget (I needed to add additional signals/slots to the widget, and I couldn't just subclass QAxWidget because the class doesn't permit that). When I need to interact with the ActiveX control, I call a method of the

问题 I'm beginning to wonder if this is impossible, but I thought I'd ask in case there's a clever way to get around the problems I'm having. I have a Qt application that uses an ActiveX control. The control is held by a QAxWidget, and the QAxWidget itself is contained within another QWidget (I needed to add additional signals/slots to the widget, and I couldn't just subclass QAxWidget because the class doesn't permit that). When I need to interact with the ActiveX control, I call a method of the

问题 I have suddently found that @Cacheable not worked when i call cacheable method from method inside not bean class. Please find below my code and help me what is issue or something i miss. EmployeeDAO.java @Component("employeeDAO") public class EmployeeDAO { private static EmployeeDAO staticEmployeeDAO; public static EmployeeDAO getInstance(){ return staticEmployeeDAO; } @PostConstruct void initStatic(){ staticEmployeeDAO = this; } @Cacheable(value = "employeeCache") public List<Employee>

问题 This question already has answers here : How do I execute QTcpSocket in a different thread? (4 answers) Closed 15 days ago . I am moving some sockets from main thread to worker thread and processing readyRead() , close() , write() etc. on the new thread. Rarely I see below dangerous warning: "QSocketNotifier: Socket notifiers cannot be enabled or disabled from another thread" Usually the execution after this warning results in undefined behaviour (crash / uncaught exception / normal). Have

问题 This question already has answers here : How do I execute QTcpSocket in a different thread? (4 answers) Closed 15 days ago . I am moving some sockets from main thread to worker thread and processing readyRead() , close() , write() etc. on the new thread. Rarely I see below dangerous warning: "QSocketNotifier: Socket notifiers cannot be enabled or disabled from another thread" Usually the execution after this warning results in undefined behaviour (crash / uncaught exception / normal). Have

问题 Im running image processing on a huge dataset with multiprocessing and Im wondering if running ThreadPoolExecutor inside a Pool provides any benefit vs just simply running Pool on all items. The dataset contains multiple folders with each folder containing images, so my initial though was to split up each folder in to a process and each image in that folder to a thread. Other way would be to just get every image and run that as a process. for instance, each folder as a process and each image

问题 I have a java program that checks if numbers are prime. I tried to make it parallel by checking different numbers using separate threads. Here is my sequential program, primeSeq.java: import java.io.*; import java.text.ParseException; import java.util.concurrent.TimeUnit; import java.lang.Object; class primeSeq { static boolean isPrime(long n) { // Check base cases: // n < 2, n is 2 or 3, n is divisible by 2 or 3 if(n < 2) return false; if(n == 2 || n == 3) return true; if(n%2 == 0 || n%3 ==

问题 I have a java program that checks if numbers are prime. I tried to make it parallel by checking different numbers using separate threads. Here is my sequential program, primeSeq.java: import java.io.*; import java.text.ParseException; import java.util.concurrent.TimeUnit; import java.lang.Object; class primeSeq { static boolean isPrime(long n) { // Check base cases: // n < 2, n is 2 or 3, n is divisible by 2 or 3 if(n < 2) return false; if(n == 2 || n == 3) return true; if(n%2 == 0 || n%3 ==