Mastering C++ Multithreading

Thread pool

POCO provides a default thread pool with 16 threads. This number can be changed dynamically. Like with regular threads, a thread pool requires one to pass a Worker class instance which inherits from the Runnable class:

#include "Poco/ThreadPool.h" #include "Poco/Runnable.h" #include <iostream>  class HelloRunnable: public Poco::Runnable {     virtual void run() {         std::cout << "Hello, world!" << std::endl;     } };  int main(int argc, char** argv) {     HelloRunnable runnable;     Poco::ThreadPool::defaultPool().start(runnable);     Poco::ThreadPool::defaultPool().joinAll();     return 0; } 

The worker instance is added to the thread pool, which runs it. The thread pool cleans up threads which have been idle for a certain time when we add another ...