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 23 struct 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 35 int 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
