1 //===----------------------------------------------------------------------===//
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
7 //===----------------------------------------------------------------------===//
9 // UNSUPPORTED: libcpp-has-no-threads
10 // UNSUPPORTED: c++03, c++11
11 // XFAIL: dylib-has-no-shared_mutex
17 // template <class Mutex> class shared_lock;
21 #include <shared_mutex>
27 #include "test_macros.h"
29 std::shared_timed_mutex m;
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;
37 ms WaitTime = ms(250);
39 // Thread sanitizer causes more overhead and will sometimes cause this test
40 // to fail. To prevent this we give Thread sanitizer more time to complete the
42 #if !defined(TEST_HAS_SANITIZERS)
43 ms Tolerance = ms(25);
45 ms Tolerance = ms(25 * 5);
51 std::shared_lock<std::shared_timed_mutex> lk(m, std::defer_lock);
52 time_point t0 = Clock::now();
54 time_point t1 = Clock::now();
55 assert(lk.owns_lock() == true);
56 ns d = t1 - t0 - WaitTime;
57 assert(d < Tolerance); // within tolerance
58 #ifndef TEST_HAS_NO_EXCEPTIONS
64 catch (std::system_error& e)
66 assert(e.code().value() == EDEADLK);
71 #ifndef TEST_HAS_NO_EXCEPTIONS
77 catch (std::system_error& e)
79 assert(e.code().value() == EPERM);
87 std::vector<std::thread> v;
88 for (int i = 0; i < 5; ++i)
89 v.push_back(std::thread(f));
90 std::this_thread::sleep_for(WaitTime);