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Simple example of threading in C++
Can someone please give me an example how to create a simple application in C++ that runs two functions simultaneously? I know that this question have connections with thread management and multi-threading, but I'm basically a php programmer and I'm not really familiar with advanced C++ programming.
Here's a simple example:
#include <iostream> #include <thread> void f1() { std::cout << "This is function 1.\n"; } void f2() { std::cout << "This is a different function, let's say 2.\n"; } int main() { std::thread t1(f1), t2(f2); // run both functions at once // Final synchronisation: // All running threads must be either joined or detached t1.join(); t2.join(); } If your functions need to produce return values, you should combine the above thread objects with std::packaged_task runnable objects, available from <future>, which give you access to the return value of the thread function.
I'm going to let you do the research yourself but a simple way to achieve this is with std::async:
http://en.cppreference.com/w/cpp/thread/async
Note that it is concurrently, but not necessarily simultaneously.
I believe Boost has this too - it's either in Boost.Thread or Boost.ASIO
std::async doesn't really promise any particular order of execution. Also, it's more suitable for producing a value asynchronously rather than "running a function simultaneously"... Maybe I could get behind an std::packaged_task, but for the purpose of exposition, a flat std::thread seems to suffice.
threadclass from boost and C++11!