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) 2012 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/shared_mutex.hpp>
16 
17 // class shared_mutex;
18 
19 // bool try_lock();
20 
21 #include <boost/thread/shared_mutex.hpp>
22 #include <boost/thread/thread.hpp>
23 #include <boost/detail/lightweight_test.hpp>
24 #include "../../../timming.hpp"
25 
26 boost::shared_mutex m;
27 
28 #if defined BOOST_THREAD_USES_CHRONO
29 typedef boost::chrono::high_resolution_clock Clock;
30 typedef Clock::time_point time_point;
31 typedef Clock::duration duration;
32 typedef boost::chrono::milliseconds ms;
33 typedef boost::chrono::nanoseconds ns;
34 time_point t0;
35 time_point t1;
36 #else
37 #endif
38 
39 const ms max_diff(BOOST_THREAD_TEST_TIME_MS);
40 
f()41 void f()
42 {
43 #if defined BOOST_THREAD_USES_CHRONO
44   t0 = Clock::now();
45   BOOST_TEST(!m.try_lock());
46   BOOST_TEST(!m.try_lock());
47   BOOST_TEST(!m.try_lock());
48   while (!m.try_lock())
49     ;
50   t1 = Clock::now();
51   m.unlock();
52 #else
53   //time_point t0 = Clock::now();
54   //BOOST_TEST(!m.try_lock());
55   //BOOST_TEST(!m.try_lock());
56   //BOOST_TEST(!m.try_lock());
57   while (!m.try_lock())
58     ;
59   //time_point t1 = Clock::now();
60   m.unlock();
61   //ns d = t1 - t0 - ms(250);
62   //BOOST_TEST(d < max_diff);
63 #endif
64 }
65 
main()66 int main()
67 {
68   m.lock();
69   boost::thread t(f);
70 #if defined BOOST_THREAD_USES_CHRONO
71   time_point t2 = Clock::now();
72   boost::this_thread::sleep_for(ms(250));
73   time_point t3 = Clock::now();
74 #else
75 #endif
76   m.unlock();
77   t.join();
78 
79 #if defined BOOST_THREAD_USES_CHRONO
80   ns sleep_time = t3 - t2;
81   ns d_ns = t1 - t0 - sleep_time;
82   ms d_ms = boost::chrono::duration_cast<boost::chrono::milliseconds>(d_ns);
83   // BOOST_TEST_GE(d_ms.count(), 0);
84   BOOST_THREAD_TEST_IT(d_ms, max_diff);
85   BOOST_THREAD_TEST_IT(d_ns, ns(max_diff));
86 #endif
87 
88   return boost::report_errors();
89 }
90 
91