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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: no-threads
// UNSUPPORTED: c++03, c++11
// ALLOW_RETRIES: 2
// <shared_mutex>
// template <class Mutex> class shared_lock;
// void lock();
#include <cassert>
#include <chrono>
#include <cstdlib>
#include <mutex>
#include <shared_mutex>
#include <system_error>
#include <thread>
#include <vector>
#include "make_test_thread.h"
#include "test_macros.h"
std::shared_timed_mutex m;
typedef std::chrono::system_clock Clock;
typedef Clock::time_point time_point;
typedef Clock::duration duration;
typedef std::chrono::milliseconds ms;
typedef std::chrono::nanoseconds ns;
ms WaitTime = ms(250);
// Thread sanitizer causes more overhead and will sometimes cause this test
// to fail. To prevent this we give Thread sanitizer more time to complete the
// test.
#if !defined(TEST_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT)
ms Tolerance = ms(25);
#else
ms Tolerance = ms(25 * 5);
#endif
void f()
{
std::shared_lock<std::shared_timed_mutex> lk(m, std::defer_lock);
time_point t0 = Clock::now();
lk.lock();
time_point t1 = Clock::now();
assert(lk.owns_lock() == true);
ns d = t1 - t0 - WaitTime;
assert(d < Tolerance); // within tolerance
#ifndef TEST_HAS_NO_EXCEPTIONS
try
{
lk.lock();
assert(false);
}
catch (std::system_error& e)
{
assert(e.code().value() == EDEADLK);
}
#endif
lk.unlock();
lk.release();
#ifndef TEST_HAS_NO_EXCEPTIONS
try
{
lk.lock();
assert(false);
}
catch (std::system_error& e)
{
assert(e.code().value() == EPERM);
}
#endif
}
int main(int, char**)
{
m.lock();
std::vector<std::thread> v;
for (int i = 0; i < 5; ++i)
v.push_back(support::make_test_thread(f));
std::this_thread::sleep_for(WaitTime);
m.unlock();
for (auto& t : v)
t.join();
return 0;
}
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