1 // (C) Copyright 2013 Andrey 2 // (C) Copyright 2013 Vicente J. Botet Escriba 3 // 4 // Distributed under the Boost Software License, Version 1.0. (See 5 // accompanying file LICENSE_1_0.txt or copy at 6 // http://www.boost.org/LICENSE_1_0.txt) 7 // 8 // This performance test is based on the performance test provided by maxim.yegorushkin 9 // at https://svn.boost.org/trac/boost/ticket/7422 10 11 #define BOOST_THREAD_USES_CHRONO 12 13 #include <iostream> 14 #include <boost/thread/lock_types.hpp> 15 #include <boost/thread/thread_only.hpp> 16 #include <boost/chrono/chrono_io.hpp> 17 18 #include <boost/thread/shared_mutex.hpp> 19 20 using namespace boost; 21 22 shared_mutex mtx; 23 const int cycles = 10000; 24 shared()25void shared() 26 { 27 int cycle(0); 28 while (++cycle < cycles) 29 { 30 shared_lock<shared_mutex> lock(mtx); 31 } 32 } 33 unique()34void unique() 35 { 36 int cycle(0); 37 while (++cycle < cycles) 38 { 39 unique_lock<shared_mutex> lock(mtx); 40 } 41 } 42 main()43int main() 44 { 45 boost::chrono::high_resolution_clock::duration best_time(std::numeric_limits<boost::chrono::high_resolution_clock::duration::rep>::max BOOST_PREVENT_MACRO_SUBSTITUTION ()); 46 for (int i =100; i>0; --i) { 47 boost::chrono::high_resolution_clock clock; 48 boost::chrono::high_resolution_clock::time_point s1 = clock.now(); 49 thread t0(shared); 50 thread t1(shared); 51 thread t2(unique); 52 //thread t11(shared); 53 //thread t12(shared); 54 //thread t13(shared); 55 56 t0.join(); 57 t1.join(); 58 t2.join(); 59 //t11.join(); 60 // t12.join(); 61 // t13.join(); 62 boost::chrono::high_resolution_clock::time_point f1 = clock.now(); 63 //std::cout << " Time spent:" << (f1 - s1) << std::endl; 64 best_time = std::min BOOST_PREVENT_MACRO_SUBSTITUTION (best_time, f1 - s1); 65 66 } 67 std::cout << "Best Time spent:" << best_time << std::endl; 68 std::cout << "Time spent/cycle:" << best_time/cycles/3 << std::endl; 69 70 return 1; 71 } 72 73