74 lines
1.9 KiB
C++
74 lines
1.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// UNSUPPORTED: libcpp-has-no-threads
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// <mutex>
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// template <class ...Mutex> class scoped_lock;
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// scoped_lock(adopt_lock_t, Mutex&...);
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#include <mutex>
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#include <cassert>
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#include "test_macros.h"
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struct TestMutex {
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bool locked = false;
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TestMutex() = default;
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void lock() { assert(!locked); locked = true; }
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bool try_lock() { if (locked) return false; locked = true; return true; }
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void unlock() { assert(locked); locked = false; }
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TestMutex(TestMutex const&) = delete;
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TestMutex& operator=(TestMutex const&) = delete;
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};
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int main(int, char**)
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{
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{
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using LG = std::scoped_lock<>;
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LG lg(std::adopt_lock);
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}
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{
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TestMutex m1;
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using LG = std::scoped_lock<TestMutex>;
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m1.lock();
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{
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LG lg(std::adopt_lock, m1);
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assert(m1.locked);
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}
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assert(!m1.locked);
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}
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{
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TestMutex m1, m2;
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using LG = std::scoped_lock<TestMutex, TestMutex>;
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m1.lock(); m2.lock();
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{
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LG lg(std::adopt_lock, m1, m2);
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assert(m1.locked && m2.locked);
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}
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assert(!m1.locked && !m2.locked);
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}
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{
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TestMutex m1, m2, m3;
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using LG = std::scoped_lock<TestMutex, TestMutex, TestMutex>;
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m1.lock(); m2.lock(); m3.lock();
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{
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LG lg(std::adopt_lock, m1, m2, m3);
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assert(m1.locked && m2.locked && m3.locked);
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}
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assert(!m1.locked && !m2.locked && !m3.locked);
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}
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return 0;
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}
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