| //===----------------------------------------------------------------------===// |
| // |
| // 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: libcpp-has-no-threads |
| |
| // <mutex> |
| |
| // template <class Mutex> class unique_lock; |
| |
| // bool try_lock(); |
| |
| #include <mutex> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| bool try_lock_called = false; |
| |
| struct mutex |
| { |
| bool try_lock() |
| { |
| try_lock_called = !try_lock_called; |
| return try_lock_called; |
| } |
| void unlock() {} |
| }; |
| |
| mutex m; |
| |
| int main(int, char**) |
| { |
| std::unique_lock<mutex> lk(m, std::defer_lock); |
| assert(lk.try_lock() == true); |
| assert(try_lock_called == true); |
| assert(lk.owns_lock() == true); |
| #ifndef TEST_HAS_NO_EXCEPTIONS |
| try |
| { |
| TEST_IGNORE_NODISCARD lk.try_lock(); |
| assert(false); |
| } |
| catch (std::system_error& e) |
| { |
| assert(e.code().value() == EDEADLK); |
| } |
| #endif |
| lk.unlock(); |
| assert(lk.try_lock() == false); |
| assert(try_lock_called == false); |
| assert(lk.owns_lock() == false); |
| lk.release(); |
| #ifndef TEST_HAS_NO_EXCEPTIONS |
| try |
| { |
| TEST_IGNORE_NODISCARD lk.try_lock(); |
| assert(false); |
| } |
| catch (std::system_error& e) |
| { |
| assert(e.code().value() == EPERM); |
| } |
| #endif |
| |
| return 0; |
| } |