The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference, 2nd Edition
by Nicolai M. Josuttis, Addison Wesley Longman, 2012
Copyright © 2012 by Pearson Education, Inc. and Nicolai M. Josuttis
#include <thread>
#include <chrono>
#include <random>
#include <iostream>
#include <exception>
using namespace std;
void doSomething (int num, char c)
{
try {
// random-number generator (use c as seed to get different sequences)
default_random_engine dre(42*c);
uniform_int_distribution<int> id(10,1000);
for (int i=0; i<num; ++i) {
this_thread::sleep_for(chrono::milliseconds(id(dre)));
cout.put(c).flush();
//...
}
}
// make sure no exception leaves the thread and terminates the program
catch (const exception& e) {
cerr << "THREAD-EXCEPTION (thread "
<< this_thread::get_id() << "): " << e.what() << endl;
}
catch (...) {
cerr << "THREAD-EXCEPTION (thread "
<< this_thread::get_id() << ")" << endl;
}
}
int main()
{
try {
thread t1(doSomething,5,'.'); // print five dots in separate thread
cout << "- started fg thread " << t1.get_id() << endl;
// print other characters in other background threads
for (int i=0; i<5; ++i) {
thread t(doSomething,10,'a'+i); // print 10 chars in separate thread
cout << "- detach started bg thread " << t.get_id() << endl;
t.detach(); // detach thread into the background
}
cin.get(); // wait for any input (return)
cout << "- join fg thread " << t1.get_id() << endl;
t1.join(); // wait for t1 to finish
}
catch (const exception& e) {
cerr << "EXCEPTION: " << e.what() << endl;
}
}