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 // <shared_mutex> 11 12 // template <class Mutex> class shared_lock; 13 14 // template <class Rep, class Period> 15 // bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); 16 17 #include <shared_mutex> 18 #include <cassert> 19 20 #if _LIBCPP_STD_VER > 11 21 22 bool try_lock_for_called = false; 23 24 typedef std::chrono::milliseconds ms; 25 26 struct mutex 27 { 28 template <class Rep, class Period> try_lock_shared_formutex29 bool try_lock_shared_for(const std::chrono::duration<Rep, Period>& rel_time) 30 { 31 assert(rel_time == ms(5)); 32 try_lock_for_called = !try_lock_for_called; 33 return try_lock_for_called; 34 } unlock_sharedmutex35 void unlock_shared() {} 36 }; 37 38 mutex m; 39 40 #endif // _LIBCPP_STD_VER > 11 41 main()42int main() 43 { 44 #if _LIBCPP_STD_VER > 11 45 std::shared_lock<mutex> lk(m, std::defer_lock); 46 assert(lk.try_lock_for(ms(5)) == true); 47 assert(try_lock_for_called == true); 48 assert(lk.owns_lock() == true); 49 try 50 { 51 lk.try_lock_for(ms(5)); 52 assert(false); 53 } 54 catch (std::system_error& e) 55 { 56 assert(e.code().value() == EDEADLK); 57 } 58 lk.unlock(); 59 assert(lk.try_lock_for(ms(5)) == false); 60 assert(try_lock_for_called == false); 61 assert(lk.owns_lock() == false); 62 lk.release(); 63 try 64 { 65 lk.try_lock_for(ms(5)); 66 assert(false); 67 } 68 catch (std::system_error& e) 69 { 70 assert(e.code().value() == EPERM); 71 } 72 #endif // _LIBCPP_STD_VER > 11 73 } 74