| //===----------------------------------------------------------------------===// |
| // |
| // 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 lock_guard; |
| |
| // lock_guard(mutex_type& m, adopt_lock_t); |
| |
| #include <mutex> |
| #include <cstdlib> |
| #include <cassert> |
| |
| #include "make_test_thread.h" |
| #include "test_macros.h" |
| |
| std::mutex m; |
| |
| void do_try_lock() { |
| assert(m.try_lock() == false); |
| } |
| |
| int main(int, char**) { |
| { |
| m.lock(); |
| std::lock_guard<std::mutex> lg(m, std::adopt_lock); |
| std::thread t = support::make_test_thread(do_try_lock); |
| t.join(); |
| } |
| |
| m.lock(); |
| m.unlock(); |
| |
| return 0; |
| } |