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: libcpp-has-no-threads 10 11 // <mutex> 12 13 // template <class Mutex> class unique_lock; 14 15 // mutex_type *mutex() const; 16 17 #include <mutex> 18 #include <cassert> 19 20 #include "test_macros.h" 21 22 std::mutex m; 23 main(int,char **)24int main(int, char**) 25 { 26 std::unique_lock<std::mutex> lk0; 27 assert(lk0.mutex() == nullptr); 28 std::unique_lock<std::mutex> lk1(m); 29 assert(lk1.mutex() == &m); 30 lk1.unlock(); 31 assert(lk1.mutex() == &m); 32 33 return 0; 34 } 35