ceph/src/boost/libs/fiber/examples/join.cpp

   1
   2 //          Copyright Oliver Kowalke 2013.
   3 // Distributed under the Boost Software License, Version 1.0.
   4 //    (See accompanying file LICENSE_1_0.txt or copy at
   5 //          http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #include <cstdlib>
   8 #include <functional>
   9 #include <stdexcept>
  10 #include <iostream>
  11 #include <string>
  12
  13 #include <boost/fiber/all.hpp>
  14
  15 int value1 = 0;
  16 int value2 = 0;
  17
  18 void fn1()
  19 {
  20     boost::fibers::fiber::id id = boost::this_fiber::get_id();
  21     for ( int i = 0; i < 5; ++i)
  22     {
  23         ++value1;
  24         std::cout << "fiber " << id << " fn1: increment value1: " << value1 << std::endl;
  25         boost::this_fiber::yield();
  26     }
  27     std::cout << "fiber " << id << " fn1: returns" << std::endl;
  28 }
  29
  30 void fn2( boost::fibers::fiber & f)
  31 {
  32     boost::fibers::fiber::id id = boost::this_fiber::get_id();
  33     for ( int i = 0; i < 5; ++i)
  34     {
  35         ++value2;
  36         std::cout << "fiber " << id << " fn2: increment value2: " << value2 << std::endl;
  37         if ( i == 1)
  38         {
  39             boost::fibers::fiber::id id = f.get_id();
  40             std::cout << "fiber " << id << " fn2: joins fiber " << id << std::endl;
  41             f.join();
  42             std::cout << "fiber " << id << " fn2: joined fiber " << id << std::endl;
  43         }
  44         boost::this_fiber::yield();
  45     }
  46     std::cout << "fiber " << id << " fn2: returns" << std::endl;
  47 }
  48
  49 int main()
  50 {
  51     try
  52     {
  53         boost::fibers::fiber f1( fn1);
  54         boost::fibers::fiber f2( fn2, std::ref( f1) );
  55
  56         f2.join();
  57
  58         std::cout << "done." << std::endl;
  59
  60         return EXIT_SUCCESS;
  61     }
  62     catch ( std::exception const& e)
  63     { std::cerr << "exception: " << e.what() << std::endl; }
  64     catch (...)
  65     { std::cerr << "unhandled exception" << std::endl; }
  66     return EXIT_FAILURE;
  67 }