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
13 // dylib support for shared_mutex was added in macosx10.12
14 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
18 // template <class Mutex> class shared_lock;
22 #include <shared_mutex>
28 #include "make_test_thread.h"
29 #include "test_macros.h"
31 std::shared_timed_mutex m;
33 typedef std::chrono::system_clock Clock;
34 typedef Clock::time_point time_point;
35 typedef Clock::duration duration;
36 typedef std::chrono::milliseconds ms;
37 typedef std::chrono::nanoseconds ns;
39 ms WaitTime = ms(250);
41 // Thread sanitizer causes more overhead and will sometimes cause this test
42 // to fail. To prevent this we give Thread sanitizer more time to complete the
44 #if !defined(TEST_HAS_SANITIZERS)
45 ms Tolerance = ms(25);
47 ms Tolerance = ms(25 * 5);
53 std::shared_lock<std::shared_timed_mutex> lk(m, std::defer_lock);
54 time_point t0 = Clock::now();
56 time_point t1 = Clock::now();
57 assert(lk.owns_lock() == true);
58 ns d = t1 - t0 - WaitTime;
59 assert(d < Tolerance); // within tolerance
60 #ifndef TEST_HAS_NO_EXCEPTIONS
66 catch (std::system_error& e)
68 assert(e.code().value() == EDEADLK);
73 #ifndef TEST_HAS_NO_EXCEPTIONS
79 catch (std::system_error& e)
81 assert(e.code().value() == EPERM);
89 std::vector<std::thread> v;
90 for (int i = 0; i < 5; ++i)
91 v.push_back(support::make_test_thread(f));
92 std::this_thread::sleep_for(WaitTime);