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 12 // <shared_mutex> 13 14 // template <class Mutex> class shared_lock; 15 16 // template <class Clock, class Duration> 17 // bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); 18 19 #include <shared_mutex> 20 #include <cassert> 21 22 #if _LIBCPP_STD_VER > 11 23 24 bool try_lock_until_called = false; 25 26 struct mutex 27 { 28 template <class Clock, class Duration> try_lock_shared_untilmutex29 bool try_lock_shared_until(const std::chrono::time_point<Clock, Duration>& abs_time) 30 { 31 typedef std::chrono::milliseconds ms; 32 assert(Clock::now() - abs_time < ms(5)); 33 try_lock_until_called = !try_lock_until_called; 34 return try_lock_until_called; 35 } unlock_sharedmutex36 void unlock_shared() {} 37 }; 38 39 mutex m; 40 41 #endif // _LIBCPP_STD_VER > 11 42 main()43int main() 44 { 45 #if _LIBCPP_STD_VER > 11 46 typedef std::chrono::steady_clock Clock; 47 std::shared_lock<mutex> lk(m, std::defer_lock); 48 assert(lk.try_lock_until(Clock::now()) == true); 49 assert(try_lock_until_called == true); 50 assert(lk.owns_lock() == true); 51 try 52 { 53 lk.try_lock_until(Clock::now()); 54 assert(false); 55 } 56 catch (std::system_error& e) 57 { 58 assert(e.code().value() == EDEADLK); 59 } 60 lk.unlock(); 61 assert(lk.try_lock_until(Clock::now()) == false); 62 assert(try_lock_until_called == false); 63 assert(lk.owns_lock() == false); 64 lk.release(); 65 try 66 { 67 lk.try_lock_until(Clock::now()); 68 assert(false); 69 } 70 catch (std::system_error& e) 71 { 72 assert(e.code().value() == EPERM); 73 } 74 #endif // _LIBCPP_STD_VER > 11 75 } 76