Initializing Shared Resources Once - C++ boost

C++ examples for boost:thread

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Description

Initializing Shared Resources Once 

#include <iostream>
#include <boost/thread/thread.hpp>
#include <boost/thread/once.hpp>

struct Conn {
   static void init() {++i_;}
   static boost::once_flag init_;
   static int i_;
};

int Conn::i_ = 0;
boost::once_flag Conn::init_ = BOOST_ONCE_INIT;

void worker() {
   boost::call_once(Conn::init, Conn::init_);
}

Conn c;  

int main() {

   boost::thread_group grp;

   for (int i = 0; i < 100; ++i)
      grp.create_thread(worker);

   grp.join_all();

   std::cout << c.i_ << '\n'; // c.i_ = 1
}

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