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 24bool try_lock_until_called = false; 25 26struct mutex 27{ 28 template <class Clock, class Duration> 29 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 } 36 void unlock_shared() {} 37}; 38 39mutex m; 40 41#endif // _LIBCPP_STD_VER > 11 42 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