| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | // UNSUPPORTED: no-threads |
| 10 | |
| 11 | // <mutex> |
| 12 | |
| 13 | // Make sure std::unique_lock works with std::mutex as expected. |
| 14 | |
| 15 | #include <atomic> |
| 16 | #include <cassert> |
| 17 | #include <mutex> |
| 18 | |
| 19 | #include "make_test_thread.h" |
| 20 | |
| 21 | std::atomic<bool> keep_waiting; |
| 22 | std::atomic<bool> child_thread_locked; |
| 23 | std::mutex mux; |
| 24 | bool main_thread_unlocked = false; |
| 25 | bool child_thread_unlocked = false; |
| 26 | |
| 27 | void lock_thread() { |
| 28 | std::unique_lock<std::mutex> lock(mux); |
| 29 | assert(main_thread_unlocked); |
| 30 | main_thread_unlocked = false; |
| 31 | child_thread_unlocked = true; |
| 32 | } |
| 33 | |
| 34 | void try_lock_thread() { |
| 35 | std::unique_lock<std::mutex> lock(mux, std::try_to_lock_t()); |
| 36 | assert(lock.owns_lock()); |
| 37 | child_thread_locked = true; |
| 38 | |
| 39 | while (keep_waiting) |
| 40 | std::this_thread::sleep_for(std::chrono::milliseconds(10)); |
| 41 | |
| 42 | child_thread_unlocked = true; |
| 43 | } |
| 44 | |
| 45 | int main(int, char**) { |
| 46 | { |
| 47 | mux.lock(); |
| 48 | std::thread t = support::make_test_thread(lock_thread); |
| 49 | main_thread_unlocked = true; |
| 50 | mux.unlock(); |
| 51 | t.join(); |
| 52 | assert(child_thread_unlocked); |
| 53 | } |
| 54 | |
| 55 | { |
| 56 | child_thread_unlocked = false; |
| 57 | child_thread_locked = false; |
| 58 | keep_waiting = true; |
| 59 | std::thread t = support::make_test_thread(try_lock_thread); |
| 60 | while (!child_thread_locked) |
| 61 | std::this_thread::sleep_for(std::chrono::milliseconds(10)); |
| 62 | assert(!mux.try_lock()); |
| 63 | keep_waiting = false; |
| 64 | t.join(); |
| 65 | assert(child_thread_unlocked); |
| 66 | } |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 |