| 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 | // UNSUPPORTED: c++03, c++11 |
| 11 | |
| 12 | // <shared_mutex> |
| 13 | |
| 14 | // template <class Mutex> class shared_lock; |
| 15 | |
| 16 | // mutex_type* release() noexcept; |
| 17 | |
| 18 | #include <shared_mutex> |
| 19 | #include <cassert> |
| 20 | |
| 21 | #include "test_macros.h" |
| 22 | |
| 23 | struct mutex |
| 24 | { |
| 25 | static int lock_count; |
| 26 | static int unlock_count; |
| 27 | void lock_shared() {++lock_count;} |
| 28 | void unlock_shared() {++unlock_count;} |
| 29 | }; |
| 30 | |
| 31 | int mutex::lock_count = 0; |
| 32 | int mutex::unlock_count = 0; |
| 33 | |
| 34 | mutex m; |
| 35 | |
| 36 | int main(int, char**) |
| 37 | { |
| 38 | std::shared_lock<mutex> lk(m); |
| 39 | assert(lk.mutex() == &m); |
| 40 | assert(lk.owns_lock() == true); |
| 41 | assert(mutex::lock_count == 1); |
| 42 | assert(mutex::unlock_count == 0); |
| 43 | assert(lk.release() == &m); |
| 44 | assert(lk.mutex() == nullptr); |
| 45 | assert(lk.owns_lock() == false); |
| 46 | assert(mutex::lock_count == 1); |
| 47 | assert(mutex::unlock_count == 0); |
| 48 | static_assert(noexcept(lk.release()), "release must be noexcept"); |
| 49 | |
| 50 | return 0; |
| 51 | } |
| 52 |