2659663ee3
Some time ago, I introduced shortcut features like dylib-has-no-shared_mutex to encode whether the deployment target supported shared_mutex (say). This made the test suite annotations cleaner. However, the problem with building Lit features on top of other Lit features is that it's easier for them to become stale, especially when they are generated programmatically. Furthermore, it makes the bar for defining configurations from scratch higher, since more features have to be defined. Instead, I think it's better to put the XFAILs in the tests directly, which allows cleaning them up with a simple grep.
110 lines
2.6 KiB
C++
110 lines
2.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// UNSUPPORTED: libcpp-has-no-threads
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// UNSUPPORTED: c++03, c++11
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// dylib support for shared_mutex was added in macosx10.12
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// XFAIL: with_system_cxx_lib=macosx10.11
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// XFAIL: with_system_cxx_lib=macosx10.10
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// XFAIL: with_system_cxx_lib=macosx10.9
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// ALLOW_RETRIES: 2
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// <shared_mutex>
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// template <class Mutex> class shared_lock;
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// explicit shared_lock(mutex_type& m);
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// template<class _Mutex> shared_lock(shared_lock<_Mutex>)
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// -> shared_lock<_Mutex>; // C++17
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#include <shared_mutex>
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#include <thread>
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#include <vector>
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#include <cstdlib>
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#include <cassert>
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#include "test_macros.h"
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typedef std::chrono::system_clock Clock;
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typedef Clock::time_point time_point;
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typedef Clock::duration duration;
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typedef std::chrono::milliseconds ms;
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typedef std::chrono::nanoseconds ns;
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ms WaitTime = ms(250);
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// Thread sanitizer causes more overhead and will sometimes cause this test
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// to fail. To prevent this we give Thread sanitizer more time to complete the
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// test.
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#if !defined(TEST_HAS_SANITIZERS)
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ms Tolerance = ms(50);
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#else
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ms Tolerance = ms(50 * 5);
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#endif
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std::shared_timed_mutex m;
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void f()
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{
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time_point t0 = Clock::now();
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time_point t1;
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{
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std::shared_lock<std::shared_timed_mutex> ul(m);
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t1 = Clock::now();
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}
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ns d = t1 - t0 - WaitTime;
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assert(d < Tolerance); // within tolerance
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}
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void g()
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{
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time_point t0 = Clock::now();
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time_point t1;
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{
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std::shared_lock<std::shared_timed_mutex> ul(m);
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t1 = Clock::now();
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}
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ns d = t1 - t0;
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assert(d < Tolerance); // within tolerance
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}
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int main(int, char**)
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{
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std::vector<std::thread> v;
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{
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m.lock();
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for (int i = 0; i < 5; ++i)
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v.push_back(std::thread(f));
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std::this_thread::sleep_for(WaitTime);
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m.unlock();
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for (auto& t : v)
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t.join();
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}
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{
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m.lock_shared();
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for (auto& t : v)
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t = std::thread(g);
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std::thread q(f);
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std::this_thread::sleep_for(WaitTime);
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m.unlock_shared();
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for (auto& t : v)
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t.join();
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q.join();
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}
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#ifdef __cpp_deduction_guides
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std::shared_lock sl(m);
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static_assert((std::is_same<decltype(sl), std::shared_lock<decltype(m)>>::value), "" );
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#endif
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return 0;
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}
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