Thread class

The Thread class is a simple wrapper around an OS-level thread. It takes Worker class instances which inherit from the Runnable class. The official documentation provides a basic example of this as follows:

#include "Poco/Thread.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::Thread thread; 
    thread.start(runnable); 
    thread.join(); 
    return 0; 
} 

This preceding code is a very simple "Hello world" example with a worker which only outputs a string via the standard output. The thread instance is allocated on the stack, and kept within the scope of the entry function waiting for the worker to finish using the join() function.

With many of its thread functions, POCO is quite reminiscent of Pthreads, though it does deviate significantly on points such as configuring a thread and other objects. Being a C++ library, it sets properties using class methods rather than filling in a struct and passing it as a parameter.