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 // bool try_lock(); 20 21 #include <boost/thread/null_mutex.hpp> 22 #include <boost/thread/thread.hpp> 23 #include <boost/detail/lightweight_test.hpp> 24 #include "../../../timming.hpp" 25 26 27 28 boost::null_mutex m; 29 30 #if defined BOOST_THREAD_USES_CHRONO 31 typedef boost::chrono::high_resolution_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 #else 37 #endif 38 39 const ms max_diff(BOOST_THREAD_TEST_TIME_MS); 40 f()41void f() 42 { 43 #if defined BOOST_THREAD_USES_CHRONO 44 time_point t0 = Clock::now(); 45 BOOST_TEST(m.try_lock()); 46 time_point t1 = Clock::now(); 47 BOOST_TEST(m.try_lock()); 48 m.unlock(); 49 m.unlock(); 50 ns d = t1 - t0; 51 BOOST_THREAD_TEST_IT(d, ns(max_diff)); 52 #else 53 BOOST_TEST(m.try_lock()); 54 BOOST_TEST(m.try_lock()); 55 m.unlock(); 56 m.unlock(); 57 #endif 58 } 59 main()60int main() 61 { 62 m.lock(); 63 boost::thread t(f); 64 m.unlock(); 65 t.join(); 66 67 return boost::report_errors(); 68 } 69 70 71