157 lines
4.0 KiB
C++
157 lines
4.0 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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// explicit scoped_lock(mutex_type& m);
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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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~TestMutex() { assert(!locked); }
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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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#if !defined(TEST_HAS_NO_EXCEPTIONS)
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struct TestMutexThrows {
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bool locked = false;
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bool throws_on_lock = false;
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TestMutexThrows() = default;
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~TestMutexThrows() { assert(!locked); }
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void lock() {
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assert(!locked);
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if (throws_on_lock) {
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throw 42;
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}
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locked = true;
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}
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bool try_lock() {
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if (locked) return false;
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lock();
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return true;
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}
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void unlock() { assert(locked); locked = false; }
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TestMutexThrows(TestMutexThrows const&) = delete;
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TestMutexThrows& operator=(TestMutexThrows const&) = delete;
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};
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#endif // !defined(TEST_HAS_NO_EXCEPTIONS)
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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;
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}
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{
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using LG = std::scoped_lock<TestMutex>;
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TestMutex m1;
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{
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LG lg(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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using LG = std::scoped_lock<TestMutex, TestMutex>;
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TestMutex m1, m2;
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{
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LG lg(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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using LG = std::scoped_lock<TestMutex, TestMutex, TestMutex>;
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TestMutex m1, m2, m3;
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{
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LG lg(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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#if !defined(TEST_HAS_NO_EXCEPTIONS)
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{
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using MT = TestMutexThrows;
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using LG = std::scoped_lock<MT>;
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MT m1;
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m1.throws_on_lock = true;
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try {
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LG lg(m1);
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assert(false);
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} catch (int) {}
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assert(!m1.locked);
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}
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{
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using MT = TestMutexThrows;
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using LG = std::scoped_lock<MT, MT>;
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MT m1, m2;
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m1.throws_on_lock = true;
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try {
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LG lg(m1, m2);
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assert(false);
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} catch (int) {}
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assert(!m1.locked && !m2.locked);
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}
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{
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using MT = TestMutexThrows;
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using LG = std::scoped_lock<MT, MT, MT>;
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MT m1, m2, m3;
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m2.throws_on_lock = true;
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try {
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LG lg(m1, m2, m3);
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assert(false);
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} catch (int) {}
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assert(!m1.locked && !m2.locked && !m3.locked);
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}
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#endif
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#ifdef __cpp_deduction_guides
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{
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TestMutex m1, m2, m3;
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{
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std::scoped_lock sl{};
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static_assert((std::is_same<decltype(sl), std::scoped_lock<>>::value), "" );
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}
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{
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std::scoped_lock sl{m1};
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static_assert((std::is_same<decltype(sl), std::scoped_lock<decltype(m1)>>::value), "" );
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}
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{
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std::scoped_lock sl{m1, m2};
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static_assert((std::is_same<decltype(sl), std::scoped_lock<decltype(m1), decltype(m2)>>::value), "" );
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}
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{
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std::scoped_lock sl{m1, m2, m3};
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static_assert((std::is_same<decltype(sl), std::scoped_lock<decltype(m1), decltype(m2), decltype(m3)>>::value), "" );
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}
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}
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#endif
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return 0;
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}
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