multithreading

问题 so I need to implement a following scenario: - Several tasks are running simultaneously as processes. - Each task should display a progress bar with a "Cancel" button, clicking on which should terminate it. To achieve responsive GUI, I run the task for each process in a separate thread, and it seems that I need to create a separate wx.App for each process as well, otherwise the thread seems to be not running. This setup works fine, however: a) I am not sure whether multiple wx.App 's is a

问题 so I need to implement a following scenario: - Several tasks are running simultaneously as processes. - Each task should display a progress bar with a "Cancel" button, clicking on which should terminate it. To achieve responsive GUI, I run the task for each process in a separate thread, and it seems that I need to create a separate wx.App for each process as well, otherwise the thread seems to be not running. This setup works fine, however: a) I am not sure whether multiple wx.App 's is a

问题 I have a code which is basically running an infinite loop, and in each iteration of the loop I run some instructions. Some of these instructions have to run in "parallel", which I do by using multiprocessing. Here is an example of my code structure: from multiprocessing import Pool from multiprocessing.dummy import Pool as ThreadPool def buy_fruit(fruit, number): print('I bought '+str(number)+' times the following fruit:'+fruit) return 'ok' def func1(parameter1, parameter2): myParameters=

问题 This question already has answers here : Why don't compilers merge redundant std::atomic writes? (9 answers) Can atomic loads be merged in the C++ memory model? (2 answers) Closed 9 months ago . Let std::atomic<std::int64_t> num{0}; be defined somewhere accessible/visible in the code. Is the C++ compiler allowed to replace each of the following two codes with an empty code (something that does nothing)? Similarly, are these optimizations allowed to happen at runtime? I am just trying to get a

问题 This question already has answers here : Why don't compilers merge redundant std::atomic writes? (9 answers) Can atomic loads be merged in the C++ memory model? (2 answers) Closed 9 months ago . Let std::atomic<std::int64_t> num{0}; be defined somewhere accessible/visible in the code. Is the C++ compiler allowed to replace each of the following two codes with an empty code (something that does nothing)? Similarly, are these optimizations allowed to happen at runtime? I am just trying to get a

问题 I have a code which is basically running an infinite loop, and in each iteration of the loop I run some instructions. Some of these instructions have to run in "parallel", which I do by using multiprocessing. Here is an example of my code structure: from multiprocessing import Pool from multiprocessing.dummy import Pool as ThreadPool def buy_fruit(fruit, number): print('I bought '+str(number)+' times the following fruit:'+fruit) return 'ok' def func1(parameter1, parameter2): myParameters=

问题 I got a multithreaded application in which n threads write to an ConcurrentHashMap . Another n Threads read from that Map and copy its Value to a copy List. After that the original List is removed from the map. For some reason I always get a ConcurrentModificationException . I even tried to create my own lock mechanism with a volatile boolean, but it won't work. When using Google Guava with Lists.newLinkedList() i get a ConcurrentModificationException . When using the StandardWay new

问题 I got a multithreaded application in which n threads write to an ConcurrentHashMap . Another n Threads read from that Map and copy its Value to a copy List. After that the original List is removed from the map. For some reason I always get a ConcurrentModificationException . I even tried to create my own lock mechanism with a volatile boolean, but it won't work. When using Google Guava with Lists.newLinkedList() i get a ConcurrentModificationException . When using the StandardWay new

问题 I got a multithreaded application in which n threads write to an ConcurrentHashMap . Another n Threads read from that Map and copy its Value to a copy List. After that the original List is removed from the map. For some reason I always get a ConcurrentModificationException . I even tried to create my own lock mechanism with a volatile boolean, but it won't work. When using Google Guava with Lists.newLinkedList() i get a ConcurrentModificationException . When using the StandardWay new

问题 private void Thread1_Exe() { try { int sleepValT1 = Convert.ToInt32(listBoxT2.SelectedValue); int StartLoop = 0; int EndLoop = 10000; for (int i = StartLoop; i <= EndLoop; i++) { Dispatcher.BeginInvoke( new Action(() => listboxE1.Items.Add("T1: Execution Count> " + i.ToString()))); Thread.Sleep(sleepValT1); } } catch (Exception Ex) { MessageBox.Show(Ex.Message); } } I was trying to call the above function on different thread private void thread1_Click(object sender, RoutedEventArgs e) {