1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// UNSUPPORTED: libcpp-has-no-threads 11// UNSUPPORTED: c++98, c++03, c++11, c++14 12 13// <mutex> 14 15// template <class ...Mutex> class scoped_lock; 16 17// scoped_lock(adopt_lock_t, Mutex&...); 18 19#include <mutex> 20#include <cassert> 21#include "test_macros.h" 22 23struct TestMutex { 24 bool locked = false; 25 TestMutex() = default; 26 27 void lock() { assert(!locked); locked = true; } 28 bool try_lock() { if (locked) return false; locked = true; return true; } 29 void unlock() { assert(locked); locked = false; } 30 31 TestMutex(TestMutex const&) = delete; 32 TestMutex& operator=(TestMutex const&) = delete; 33}; 34 35int main() 36{ 37 { 38 using LG = std::scoped_lock<>; 39 LG lg(std::adopt_lock); 40 } 41 { 42 TestMutex m1; 43 using LG = std::scoped_lock<TestMutex>; 44 m1.lock(); 45 { 46 LG lg(std::adopt_lock, m1); 47 assert(m1.locked); 48 } 49 assert(!m1.locked); 50 } 51 { 52 TestMutex m1, m2; 53 using LG = std::scoped_lock<TestMutex, TestMutex>; 54 m1.lock(); m2.lock(); 55 { 56 LG lg(std::adopt_lock, m1, m2); 57 assert(m1.locked && m2.locked); 58 } 59 assert(!m1.locked && !m2.locked); 60 } 61 { 62 TestMutex m1, m2, m3; 63 using LG = std::scoped_lock<TestMutex, TestMutex, TestMutex>; 64 m1.lock(); m2.lock(); m3.lock(); 65 { 66 LG lg(std::adopt_lock, m1, m2, m3); 67 assert(m1.locked && m2.locked && m3.locked); 68 } 69 assert(!m1.locked && !m2.locked && !m3.locked); 70 } 71 72} 73