1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // Copyright (C) 2011 Vicente J. Botet Escriba 11 // 12 // Distributed under the Boost Software License, Version 1.0. (See accompanying 13 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 14 15 // <boost/thread/null_mutex.hpp> 16 17 // class null_mutex; 18 19 // template <class Rep, class Period> 20 // bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); 21 22 #include <boost/thread/null_mutex.hpp> 23 #include <boost/thread/thread.hpp> 24 #include <boost/detail/lightweight_test.hpp> 25 26 #if defined BOOST_THREAD_USES_CHRONO 27 28 29 boost::null_mutex m; 30 31 typedef boost::chrono::steady_clock Clock; 32 typedef Clock::time_point time_point; 33 typedef Clock::duration duration; 34 typedef boost::chrono::milliseconds ms; 35 typedef boost::chrono::nanoseconds ns; 36 f1()37void f1() 38 { 39 time_point t0 = Clock::now(); 40 // This test is spurious as it depends on the time the thread system switches the threads 41 BOOST_TEST(m.try_lock_for(ms(100)) == true); 42 time_point t1 = Clock::now(); 43 BOOST_TEST(m.try_lock()); 44 m.unlock(); 45 m.unlock(); 46 ns d = t1 - t0 ; 47 // This test is spurious as it depends on the time the thread system switches the threads 48 BOOST_TEST(d < ns(5000000)); // within 5ms 49 } 50 51 main()52int main() 53 { 54 { 55 m.lock(); 56 boost::thread t(f1); 57 m.unlock(); 58 t.join(); 59 } 60 61 return boost::report_errors(); 62 } 63 64 #else 65 #error "Test not applicable: BOOST_THREAD_USES_CHRONO not defined for this platform as not supported" 66 #endif 67 68