| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // UNSUPPORTED: c++98, c++03, c++11, c++14 |
| |
| // <mutex> |
| |
| // template <class ...Mutex> class scoped_lock; |
| |
| // scoped_lock(adopt_lock_t, Mutex&...); |
| |
| #include <mutex> |
| #include <cassert> |
| #include "test_macros.h" |
| |
| struct TestMutex { |
| bool locked = false; |
| TestMutex() = default; |
| |
| void lock() { assert(!locked); locked = true; } |
| bool try_lock() { if (locked) return false; locked = true; return true; } |
| void unlock() { assert(locked); locked = false; } |
| |
| TestMutex(TestMutex const&) = delete; |
| TestMutex& operator=(TestMutex const&) = delete; |
| }; |
| |
| int main(int, char**) |
| { |
| { |
| using LG = std::scoped_lock<>; |
| LG lg(std::adopt_lock); |
| } |
| { |
| TestMutex m1; |
| using LG = std::scoped_lock<TestMutex>; |
| m1.lock(); |
| { |
| LG lg(std::adopt_lock, m1); |
| assert(m1.locked); |
| } |
| assert(!m1.locked); |
| } |
| { |
| TestMutex m1, m2; |
| using LG = std::scoped_lock<TestMutex, TestMutex>; |
| m1.lock(); m2.lock(); |
| { |
| LG lg(std::adopt_lock, m1, m2); |
| assert(m1.locked && m2.locked); |
| } |
| assert(!m1.locked && !m2.locked); |
| } |
| { |
| TestMutex m1, m2, m3; |
| using LG = std::scoped_lock<TestMutex, TestMutex, TestMutex>; |
| m1.lock(); m2.lock(); m3.lock(); |
| { |
| LG lg(std::adopt_lock, m1, m2, m3); |
| assert(m1.locked && m2.locked && m3.locked); |
| } |
| assert(!m1.locked && !m2.locked && !m3.locked); |
| } |
| |
| |
| return 0; |
| } |