threadpool

How to create a thread pool using boost in C++?

由 不问归期 提交于 2019-11-26 06:45:45
How do I create a thread pool using boost in C++, and how do I assign tasks to the threadpool? Jeroen Bollen The process is pretty simple. First create an asio::io_service and a thread_group. Fill the thread_group with threads linked to the io_service. Assign tasks to the threads using the boost::bind function. To stop the threads (usually when you are exiting your program) just stop the io_service and join all threads. You should only need these headers: #include <boost/asio/io_service.hpp> #include <boost/bind.hpp> #include <boost/thread/thread.hpp> here is an example: /* * Create an asio:

Why does Windows 10 start extra threads in my program?

由 左心房为你撑大大i 提交于 2019-11-26 06:44:57
问题 With Visual Studio 2015, in a new, empty C++ project, build the following for Console application: int main() { return 0; } Set a break point on the return and launch the program in the debugger. On Windows 7, as of the break point, this program has only one thread. But on Windows 10, it has five(!) threads: the main thread and four \"worker threads\" waiting on a synchronization object. Who\'s starting up the thread pool (or how do I find out)? 回答1: Crystal ball says that the Debug > Windows

multiprocessing.Pool - PicklingError: Can&#39;t pickle <type &#39;thread.lock&#39;>: attribute lookup thread.lock failed

由 爱⌒轻易说出口 提交于 2019-11-26 06:38:57
问题 multiprocessing.Pool is driving me crazy... I want to upgrade many packages, and for every one of them I have to check whether there is a greater version or not. This is done by the check_one function. The main code is in the Updater.update method: there I create the Pool object and call the map() method. Here is the code: def check_one(args): res, total, package, version = args i = res.qsize() logger.info(\'\\r[{0:.1%} - {1}, {2} / {3}]\', i / float(total), package, i, total, addn=False) try

Where do I create and use ScheduledThreadPoolExecutor, TimerTask, or Handler?

由 こ雲淡風輕ζ 提交于 2019-11-26 06:31:20
问题 I need to make my RSS Feed reader check the feed every 10 minutes for new posts, and then parse them if there are new ones. I also need to update the UI about every minute. I have read and heard different things from various sources. My current understanding is that I can use ScheduledThreadPoolExecutor to make two scheduled threads, and one of them needs a Handler for updating the UI. I am unsure about what the most efficient use of these classes or TimerTask . I am also very uncertain about

Turning an ExecutorService to daemon in Java

由 自古美人都是妖i 提交于 2019-11-26 06:29:52
问题 I am using an ExecutoreService in Java 1.6, started simply by ExecutorService pool = Executors.newFixedThreadPool(THREADS). When my main thread is finished (along with all the tasks processed by the thread pool), this pool will prevent my program from shutting down until I explicitly call pool.shutdown(); Can I avoid having to call this by somehow turning the internal thread managing used by this pool into a deamon thread? Or am I missing something here. 回答1: Probably simplest and preferred

When to use thread pool in C#? [closed]

由 狂风中的少年 提交于 2019-11-26 04:59:27
问题 I have been trying to learn multi-threaded programming in C# and I am confused about when it is best to use a thread pool vs. create my own threads. One book recommends using a thread pool for small tasks only (whatever that means), but I can\'t seem to find any real guidelines. What are some considerations you use when making this programming decision? 回答1: If you have lots of logical tasks that require constant processing and you want that to be done in parallel use the pool+scheduler. If

AsyncTask.executeOnExecutor() before API Level 11

由 主宰稳场 提交于 2019-11-26 04:39:39
问题 The normal way we do AsyncTask in Android is, from Android API: private class DoIntenseTask extends AsyncTask<Object, Object, Void> { protected Void doInBackground(Object... params) { for (Object param : params) { Object rtnObj = doIntenseJob(param); publishProgress(rtnObj); } return null; } protected void onProgressUpdate(Object... progress) { for (Object rtnObj : progress) { updateActivityUI(rtnObj); } } } My intense tasks are loosely coupled and the execution order does not matter, by

Thread pooling in C++11

由 坚强是说给别人听的谎言 提交于 2019-11-26 02:39:52
问题 Relevant questions : About C++11: C++11: std::thread pooled? Will async(launch::async) in C++11 make thread pools obsolete for avoiding expensive thread creation? About Boost: C++ boost thread reusing threads boost::thread and creating a pool of them! How do I get a pool of threads to send tasks to , without creating and deleting them over and over again? This means persistent threads to resynchronize without joining. I have code that looks like this: namespace { std::vector<std::thread>

What is the async/await equivalent of a ThreadPool server?

由 心不动则不痛 提交于 2019-11-26 02:36:27
问题 I am working on a tcp server that looks something like this using synchronous apis and the thread pool: TcpListener listener; void Serve(){ while(true){ var client = listener.AcceptTcpClient(); ThreadPool.QueueUserWorkItem(this.HandleConnection, client); //Or alternatively new Thread(HandleConnection).Start(client) } } Assuming my goal is to handle as many concurrent connections as possible with the lowest resource usage, this seems that it will be quickly limited by the number of available

How many threads is too many? [closed]

由 纵然是瞬间 提交于 2019-11-25 23:48:01
问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 2 years ago . I am writing a server, and I branch each action of into a thread when the request is incoming. I do this because almost every request makes database query. I am using a threadpool library to cut down on construction/destruction of threads. My question is though - what is a
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