c++11 - thread pool in constructor of C++ class is getting killed -


i have following code creating thread pool in constructor of class. threads got created , exited immediately. please help.

class threadpool { public:     boost::asio::io_service io_service;     boost::thread_group threads;     threadpool();     void call();     void calling();  };  threadpool::threadpool() {     /* create thread-pool */     size_t numthreads = boost::thread::hardware_concurrency();     boost::asio::io_service::work work(io_service);     for(size_t t = 0; t < numthreads; t++) {         threads.create_thread(boost::bind(&boost::asio::io_service::run, &io_service));     } }  void threadpool::call() {     std::cout << "hi i'm thread no " << boost::this_thread::get_id() << std::endl; };  void threadpool::calling() {     sleep(1);      io_service.post(boost::bind(&threadpool::call, this)); }  int main(int argc, char **argv) {    threadpool pool;    (int = 0; < 5; i++) {     pool.calling();    }    pool.threads.join_all();    return 0; }

boost::asio::io_service::work work must member of class, not destroyed.

class threadpool { public:     boost::asio::io_service io_service;     boost::thread_group threads;     boost::asio::io_service::work *work;     threadpool();     void call();     void calling();      void stop() { delete work; } };  threadpool::threadpool() :  work(new boost::asio::io_service::work(io_service)) {     /* create thread-pool */     size_t numthreads = boost::thread::hardware_concurrency();     for(size_t t = 0; t < numthreads; t++) {         threads.create_thread(boost::bind(&boost::asio::io_service::run, &io_service));     } }  void threadpool::call() {     std::cout << "hi i'm thread no " << boost::this_thread::get_id() << std::endl; };  void threadpool::calling() {     sleep(1000);      io_service.post(boost::bind(&threadpool::call, this)); }  int main() {    threadpool pool;    (int = 0; < 5; i++) {     pool.calling();    }    pool.stop();    pool.threads.join_all();    return 0; }

Comments

Post a Comment

Popular posts from this blog

asynchronous - C# WinSCP .NET assembly: How to upload multiple files asynchronously -

i using winscp .net assembly uploading files. want upload multiple files asynchronous way. have created method works single upload. public class uploadingdata { private sessionoptions _sessionoptions; private session _session; //connection etc private void onconnected() { foreach (var fileinfo in localfileslist) { var task = task.factory.startnew(() => uploadfilesasync(fileinfo)); } } private async task uploadfilesasync(string file) { string remotefilepath = _session.translatelocalpathtoremote(file, @"/", "/test_data_upload"); var uploading = _session.putfiles(file, remotefilepath, false); //when done await task.run(() => thread.sleep(1000)); } } please suggest me correct way. thanks you can use backgroundworker class this: string[] images = new string[50]; foreach (var path in images) { backgroundworker
Read more

aws api gateway - SerializationException in posting new Records via Dynamodb Proxy Service in API -

i getting "__type": "com.amazon.coral.service#serializationexception" as reply in postman & in test console in api gateway trying post record directly dynamodb using api proxy services.. referring aws article - https://aws.amazon.com/blogs/compute/using-amazon-api-gateway-as-a-proxy-for-dynamodb/ here's mapping { "tablename": "tablenamegoeshere", "item": { "id" : "$context.requestid" "eventname" : "$input.path('$.eventname')", "timestamp" : $input.path('$.timestamp'), "answers": "$util.parsejson($input.path('$.answers'))" } } update: did asked ... , worked if try add array of json objects gives me above same error - here's trying now. please - couldnt find on google well #set($inputroot = $input.path('$')) { "tablename": "answer", "item": {
Read more

asp.net - Problems sending emails from forum -

i have been redesigning site has message board, has been written guy looked after site. it has few problems , written in .asp , uses .mdb files database. you can see whole thing here . feel free post if helps, test thing have set using original files , new database. the basic problem when posts message, supposed email sent them, have posted it. when replies, originator supposed message, replier has been posted. i’d have thought @ point in process there should script/file in postmessage.asp? the postmessage.asp page below. <% option explicit %> <!-- #include virtual="common/adovbs.inc" --> <html> <head> <meta http-equiv="content-type" content="text/html; charset=windows-1252"> <meta name="generator" content="microsoft frontpage 4.0"> <meta name="progid" content="frontpage.editor.document"> <title>new page 2</title> <base target="_self"
Read more