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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
// <shared_mutex>
// class shared_timed_mutex;
// bool try_lock_shared();
#include <shared_mutex>
#include <cassert>
#include <thread>
#include <vector>
#include "make_test_thread.h"
int main(int, char**) {
// Try to lock-shared a mutex that is not locked yet. This should succeed.
{
std::shared_timed_mutex m;
std::vector<std::thread> threads;
for (int i = 0; i != 5; ++i) {
threads.push_back(support::make_test_thread([&] {
bool succeeded = m.try_lock_shared();
assert(succeeded);
m.unlock_shared();
}));
}
for (auto& t : threads)
t.join();
}
// Try to lock-shared a mutex that is already exclusively locked. This should fail.
{
std::shared_timed_mutex m;
m.lock();
std::vector<std::thread> threads;
for (int i = 0; i != 5; ++i) {
threads.push_back(support::make_test_thread([&] {
bool succeeded = m.try_lock_shared();
assert(!succeeded);
}));
}
for (auto& t : threads)
t.join();
m.unlock();
}
// Try to lock-shared a mutex that is already lock-shared. This should succeed.
{
std::shared_timed_mutex m;
m.lock_shared();
std::vector<std::thread> threads;
for (int i = 0; i != 5; ++i) {
threads.push_back(support::make_test_thread([&] {
bool succeeded = m.try_lock_shared();
assert(succeeded);
m.unlock_shared();
}));
}
m.unlock_shared();
for (auto& t : threads)
t.join();
}
return 0;
}
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