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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 | ||
25 | ||
26 | ||
27 | boost::null_mutex m; | |
28 | ||
29 | #if defined BOOST_THREAD_USES_CHRONO | |
30 | typedef boost::chrono::system_clock Clock; | |
31 | typedef Clock::time_point time_point; | |
32 | typedef Clock::duration duration; | |
33 | typedef boost::chrono::milliseconds ms; | |
34 | typedef boost::chrono::nanoseconds ns; | |
35 | #else | |
36 | #endif | |
37 | ||
38 | void f() | |
39 | { | |
40 | #if defined BOOST_THREAD_USES_CHRONO | |
41 | time_point t0 = Clock::now(); | |
42 | BOOST_TEST(m.try_lock()); | |
43 | time_point t1 = Clock::now(); | |
44 | BOOST_TEST(m.try_lock()); | |
45 | m.unlock(); | |
46 | m.unlock(); | |
47 | ns d = t1 - t0; | |
48 | // This test is spurious as it depends on the time the thread system switches the threads | |
49 | BOOST_TEST(d < ns(50000000)); // within 50ms | |
50 | #else | |
51 | BOOST_TEST(m.try_lock()); | |
52 | BOOST_TEST(m.try_lock()); | |
53 | m.unlock(); | |
54 | m.unlock(); | |
55 | #endif | |
56 | } | |
57 | ||
58 | int main() | |
59 | { | |
60 | m.lock(); | |
61 | boost::thread t(f); | |
62 | m.unlock(); | |
63 | t.join(); | |
64 | ||
65 | return boost::report_errors(); | |
66 | } | |
67 | ||
68 |