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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/locks.hpp> | |
16 | ||
17 | // template <class Mutex> class shared_lock; | |
18 | ||
19 | // shared_lock(mutex_type& m, try_to_lock_t); | |
20 | ||
21 | ||
22 | #include <boost/thread/lock_types.hpp> | |
23 | #include <boost/thread/shared_mutex.hpp> | |
24 | #include <boost/thread/thread.hpp> | |
25 | #include <boost/detail/lightweight_test.hpp> | |
26 | ||
27 | boost::shared_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 | { | |
43 | boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock); | |
44 | BOOST_TEST(lk.owns_lock() == false); | |
45 | } | |
46 | { | |
47 | boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock); | |
48 | BOOST_TEST(lk.owns_lock() == false); | |
49 | } | |
50 | { | |
51 | boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock); | |
52 | BOOST_TEST(lk.owns_lock() == false); | |
53 | } | |
54 | for (;;) | |
55 | { | |
56 | boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock); | |
57 | if (lk.owns_lock()) break; | |
58 | } | |
59 | time_point t1 = Clock::now(); | |
60 | ns d = t1 - t0 - ms(250); | |
61 | // This test is spurious as it depends on the time the thread system switches the threads | |
62 | BOOST_TEST(d < ns(50000000)+ms(1000)); // within 50ms | |
63 | #else | |
64 | // time_point t0 = Clock::now(); | |
65 | // { | |
66 | // boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock); | |
67 | // BOOST_TEST(lk.owns_lock() == false); | |
68 | // } | |
69 | // { | |
70 | // boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock); | |
71 | // BOOST_TEST(lk.owns_lock() == false); | |
72 | // } | |
73 | // { | |
74 | // boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock); | |
75 | // BOOST_TEST(lk.owns_lock() == false); | |
76 | // } | |
77 | for (;;) | |
78 | { | |
79 | boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock); | |
80 | if (lk.owns_lock()) break; | |
81 | } | |
82 | //time_point t1 = Clock::now(); | |
83 | //ns d = t1 - t0 - ms(250); | |
84 | // This test is spurious as it depends on the time the thread system switches the threads | |
85 | //BOOST_TEST(d < ns(50000000)+ms(1000)); // within 50ms | |
86 | #endif | |
87 | } | |
88 | ||
89 | int main() | |
90 | { | |
91 | m.lock(); | |
92 | boost::thread t(f); | |
93 | #if defined BOOST_THREAD_USES_CHRONO | |
94 | boost::this_thread::sleep_for(ms(250)); | |
95 | #else | |
96 | #endif | |
97 | m.unlock(); | |
98 | t.join(); | |
99 | ||
100 | return boost::report_errors(); | |
101 | } | |
102 |