63d88ed5bf
This makes its role clearer. It's plausible that one may want to manually define TEST_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT when running the tests in some environments - in particular, it seems to be necessary to use the higher tolerance timeouts if running the tests on Windows runners on Github Actions. Also add the descriptive comment in one file where it was missing. Differential Revision: https://reviews.llvm.org/D131484
99 lines
2.3 KiB
C++
99 lines
2.3 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: no-threads
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// UNSUPPORTED: c++03, c++11
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// ALLOW_RETRIES: 2
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// dylib support for shared_mutex was added in macosx10.12
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// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
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// <shared_mutex>
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// template <class Mutex> class shared_lock;
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// void lock();
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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 "make_test_thread.h"
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#include "test_macros.h"
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std::shared_timed_mutex m;
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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_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT)
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ms Tolerance = ms(25);
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#else
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ms Tolerance = ms(25 * 5);
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#endif
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void f()
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{
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std::shared_lock<std::shared_timed_mutex> lk(m, std::defer_lock);
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time_point t0 = Clock::now();
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lk.lock();
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time_point t1 = Clock::now();
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assert(lk.owns_lock() == true);
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ns d = t1 - t0 - WaitTime;
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assert(d < Tolerance); // within tolerance
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#ifndef TEST_HAS_NO_EXCEPTIONS
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try
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{
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lk.lock();
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assert(false);
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}
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catch (std::system_error& e)
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{
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assert(e.code().value() == EDEADLK);
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}
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#endif
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lk.unlock();
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lk.release();
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#ifndef TEST_HAS_NO_EXCEPTIONS
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try
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{
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lk.lock();
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assert(false);
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}
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catch (std::system_error& e)
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{
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assert(e.code().value() == EPERM);
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}
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#endif
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}
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int main(int, char**)
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{
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m.lock();
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std::vector<std::thread> v;
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for (int i = 0; i < 5; ++i)
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v.push_back(support::make_test_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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return 0;
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}
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