Simple C++0x Thread example

hello.cpp

// Author: Alex Hart
// Compiling: g++ -o hello hello.cpp -lpthread --std=c++0x

#include<iostream>
#include<thread>
#include<cstdlib>
using namespace std;

mutex a;

void th_func(int id) {
    a.lock();
    cout << "Hello World! " << id << endl;
    a.unlock();
}

int main(int argc, char** argv) {

    thread* th_list[20];
    for(int id = 0; id < 20; id++) {
        th_list[id] = new thread(th_func, id);
    }

    for(auto thread : th_list) {
        thread->join();
    }

    for(auto thread: th_list) {
        delete thread;
    }

    return EXIT_SUCCESS;
}