multithreading

问题 I made my first game in Java - Snake, it's main loop looks like this while (true) { long start = System.nanoTime(); model.eUpdate(); if (model.hasElapsedCycle()) { model.updateGame(); } view.refresh(); long delta = (System.nanoTime() - start) / 1000000L; if (delta < model.getFrameTime()) { try { Thread.sleep(model.getFrameTime() - delta); } catch (Exception e) { e.printStackTrace(); } } } But in my project's requirments there is a responsivity point, so I need to change the Thread.sleep()

问题 I made my first game in Java - Snake, it's main loop looks like this while (true) { long start = System.nanoTime(); model.eUpdate(); if (model.hasElapsedCycle()) { model.updateGame(); } view.refresh(); long delta = (System.nanoTime() - start) / 1000000L; if (delta < model.getFrameTime()) { try { Thread.sleep(model.getFrameTime() - delta); } catch (Exception e) { e.printStackTrace(); } } } But in my project's requirments there is a responsivity point, so I need to change the Thread.sleep()

问题 In this example, is this the correct use of the Parallel.For loop if I want to limit the number of threads that can perform the function DoWork to ten at a time? Will other threads be blocked until one of the ten threads becomes available? If not, what is a better multi-threaded solution that would still let me execute that function 6000+ times? class Program { static void Main(string[] args) { ThreadExample ex = new ThreadExample(); } } public class ThreadExample { int limit = 6411; public

问题 In kernel version before 5.2, I use save_stack_trace_tsk to retrieve call stack. But this method is no longer available in Linux kernel 5.2+, what should I use? 回答1: This question seemed so tempting so I did some digging here is my findings. TLDR; stack_trace_save () functions replaced by arch_stack_walk() interfaces * this is part of consolidation plan and remove duplicate code. linux commit 214d8ca6ee854 provide common architecture to walking stack trace. the new interface called arch_stack

问题 In kernel version before 5.2, I use save_stack_trace_tsk to retrieve call stack. But this method is no longer available in Linux kernel 5.2+, what should I use? 回答1: This question seemed so tempting so I did some digging here is my findings. TLDR; stack_trace_save () functions replaced by arch_stack_walk() interfaces * this is part of consolidation plan and remove duplicate code. linux commit 214d8ca6ee854 provide common architecture to walking stack trace. the new interface called arch_stack

问题 I'm not sure I got the terminology right but here goes - I have this function that is used by multiple threads to write data (using pseudo code in comments to illustrate what I want) //these are initiated in the constructor int* data; std::atomic<size_t> size; void write(int value) { //wait here while "read_lock" //set "write_lock" to "write_lock" + 1 auto slot = size.fetch_add(1, std::memory_order_acquire); data[slot] = value; //set "write_lock" to "write_lock" - 1 } the order of the writes

问题 I'm not sure I got the terminology right but here goes - I have this function that is used by multiple threads to write data (using pseudo code in comments to illustrate what I want) //these are initiated in the constructor int* data; std::atomic<size_t> size; void write(int value) { //wait here while "read_lock" //set "write_lock" to "write_lock" + 1 auto slot = size.fetch_add(1, std::memory_order_acquire); data[slot] = value; //set "write_lock" to "write_lock" - 1 } the order of the writes

问题 I've looked around trying to understand how SetInterval but only found how to use it. I already know it's functionality, I'm just curious about how it's able to run something on a separate thread when JS doesn't support threading(at least that's what I read). I hope I formulated the question properly. Thanks. 回答1: setInterval does not run anything on a different thread. It schedules something to run at certain times provided the JS runtime is idle at that time . You can try out this behavior

问题 AFAIK some methods in the .Net library are able to do I/O jobs asynchronously without consuming a thread from the pool . If my information are correct the WebClient *Async methods do that. I'd like to verify it by checking that effectively threads from the pool are not used during a download. So my general question is : how can I monitor the current state of the thread-pool? number of threads number of busy threads Is there some API ( GetAvailableThreads ?) or performance counters that would

问题 AFAIK some methods in the .Net library are able to do I/O jobs asynchronously without consuming a thread from the pool . If my information are correct the WebClient *Async methods do that. I'd like to verify it by checking that effectively threads from the pool are not used during a download. So my general question is : how can I monitor the current state of the thread-pool? number of threads number of busy threads Is there some API ( GetAvailableThreads ?) or performance counters that would