multithreading

问题 I want to send a message with a socket. I checked all my options for receiving and sending messages (if there is a better way than this please tell me). I have a problem. I saw in the video how to do it, but they do not show how to send a message with it. How can I send a message with this? How do I use the "Thread3" class? private PrintWriter output; private BufferedReader input; class Thread1 implements Runnable { @Override public void run() { Socket socket; try { socket = new Socket("105

问题 I want to send a message with a socket. I checked all my options for receiving and sending messages (if there is a better way than this please tell me). I have a problem. I saw in the video how to do it, but they do not show how to send a message with it. How can I send a message with this? How do I use the "Thread3" class? private PrintWriter output; private BufferedReader input; class Thread1 implements Runnable { @Override public void run() { Socket socket; try { socket = new Socket("105

问题 I want to send a message with a socket. I checked all my options for receiving and sending messages (if there is a better way than this please tell me). I have a problem. I saw in the video how to do it, but they do not show how to send a message with it. How can I send a message with this? How do I use the "Thread3" class? private PrintWriter output; private BufferedReader input; class Thread1 implements Runnable { @Override public void run() { Socket socket; try { socket = new Socket("105

问题 import Dispatch class SynchronizedArray<T> { private var array: [T] = [] private let accessQueue = DispatchQueue(label: "SynchronizedArrayAccess", attributes: .concurrent) var get: [T] { accessQueue.sync { array } } func append(newElement: T) { accessQueue.async(flags: .barrier) { self.array.append(newElement) } } } If I run the following code, 10,000 elements are appended to the array as expected even if I am reading concurrently: DispatchQueue.concurrentPerform(iterations: 10000) { i in _

问题 import Dispatch class SynchronizedArray<T> { private var array: [T] = [] private let accessQueue = DispatchQueue(label: "SynchronizedArrayAccess", attributes: .concurrent) var get: [T] { accessQueue.sync { array } } func append(newElement: T) { accessQueue.async(flags: .barrier) { self.array.append(newElement) } } } If I run the following code, 10,000 elements are appended to the array as expected even if I am reading concurrently: DispatchQueue.concurrentPerform(iterations: 10000) { i in _

问题 I recently started getting error on my project which calls a third party api which usually takes 40sec. Looks like db connection from hikaripool is hijacked by the parent thread and is not available for other concurrent requests Here is the overview of the implemention DB insert (business logic) Restemplate call (40 sec) DB update (business logic) Some errors on high concurrency java.sql.SQLTransientConnectionException: HikariPool-1 - Connection is not available, request timed out after

问题 Remy posted a great solution to pass any function with any number of arguments to std::thread , here. I was wondering how it could be used for class member functions. #include <iostream> #include <thread> #include <mutex> #define __PRETTY_FUNCTION__ __FUNCSIG__ std::mutex my_mutex; template<class Function, class... Args> void runFunctionInThread(Function f, Args&&... args) { // Beside starting a thread, this function performs other // task using the function and its arguments. std::thread t(f

问题 Consider a parallel program written in OpenMP. Suppose there is a loop that iterates from 0 to N-1. Suppose that there are num_threads threads. Suppose you want to divide the loop iterations so that thread 0 computes the first N/num_threads iterations, thread 1 computes the next N/num_threads iterations, etc. If N is divisible by num_threads and rank is the thread's id (from rank 0 to num_threads-1), then each thread can execute the following code to get its loop start and end index: int

问题 I am trying to write a server class with a method that takes a function as an argument and pass in a value (generated inside the server class) to the function for being run inside a thread. The following is just an example to illustrate what I am trying to do. My goal is to have the Server::runFunctionInThread general enough that works for methods of different classes as well as for functions that do not belong to any classes. Is this a possible thing to do? #include <iostream> #include

问题 I have written a Tkinter and I hope to have a Listener to monitor the Keyboard Input by Users. But when I use mainloop() to start the Tkinter, the Listener cannot work together with it, and will start until I quit Tkinter. I have tried to add this Listener in Tkinter sub-unit, but it does not work as the same. def initialization(): print("Starting...") print("Start listener...") with mouse.Listener(on_click=onMouseClick) as listener: listener.join() if __name__ == "__main__" : root = tk.Tk()