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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
// <mutex>
// Make sure std::unique_lock works with std::mutex as expected.
#include <atomic>
#include <cassert>
#include <mutex>
#include "make_test_thread.h"
std::atomic<bool> keep_waiting;
std::atomic<bool> child_thread_locked;
std::mutex mux;
bool main_thread_unlocked = false;
bool child_thread_unlocked = false;
void lock_thread() {
std::unique_lock<std::mutex> lock(mux);
assert(main_thread_unlocked);
main_thread_unlocked = false;
child_thread_unlocked = true;
}
void try_lock_thread() {
std::unique_lock<std::mutex> lock(mux, std::try_to_lock_t());
assert(lock.owns_lock());
child_thread_locked = true;
while (keep_waiting)
std::this_thread::sleep_for(std::chrono::milliseconds(10));
child_thread_unlocked = true;
}
int main(int, char**) {
{
mux.lock();
std::thread t = support::make_test_thread(lock_thread);
main_thread_unlocked = true;
mux.unlock();
t.join();
assert(child_thread_unlocked);
}
{
child_thread_unlocked = false;
child_thread_locked = false;
keep_waiting = true;
std::thread t = support::make_test_thread(try_lock_thread);
while (!child_thread_locked)
std::this_thread::sleep_for(std::chrono::milliseconds(10));
assert(!mux.try_lock());
keep_waiting = false;
t.join();
assert(child_thread_unlocked);
}
return 0;
}
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