1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // UNSUPPORTED: libcpp-has-no-threads
10 // ALLOW_RETRIES: 2
11 
12 // TODO(ldionne): This test fails on Ubuntu Focal on our CI nodes (and only there), in 32 bit mode.
13 // UNSUPPORTED: linux && 32bits-on-64bits
14 
15 // <mutex>
16 
17 // template <class Mutex> class unique_lock;
18 
19 // void lock();
20 
21 #include <mutex>
22 #include <thread>
23 #include <cstdlib>
24 #include <cassert>
25 
26 #include "make_test_thread.h"
27 #include "test_macros.h"
28 
29 std::mutex m;
30 
31 typedef std::chrono::system_clock Clock;
32 typedef Clock::time_point time_point;
33 typedef Clock::duration duration;
34 typedef std::chrono::milliseconds ms;
35 typedef std::chrono::nanoseconds ns;
36 
37 void f()
38 {
39     std::unique_lock<std::mutex> lk(m, std::defer_lock);
40     time_point t0 = Clock::now();
41     lk.lock();
42     time_point t1 = Clock::now();
43     assert(lk.owns_lock() == true);
44     ns d = t1 - t0 - ms(250);
45     assert(d < ms(25));  // within 25ms
46 #ifndef TEST_HAS_NO_EXCEPTIONS
47     try
48     {
49         lk.lock();
50         assert(false);
51     }
52     catch (std::system_error& e)
53     {
54         assert(e.code().value() == EDEADLK);
55     }
56 #endif
57     lk.unlock();
58     lk.release();
59 #ifndef TEST_HAS_NO_EXCEPTIONS
60     try
61     {
62         lk.lock();
63         assert(false);
64     }
65     catch (std::system_error& e)
66     {
67         assert(e.code().value() == EPERM);
68     }
69 #endif
70 }
71 
72 int main(int, char**)
73 {
74     m.lock();
75     std::thread t = support::make_test_thread(f);
76     std::this_thread::sleep_for(ms(250));
77     m.unlock();
78     t.join();
79 
80   return 0;
81 }
82