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// <mutex> 11 12// template <class Mutex> class unique_lock; 13 14// template <class Rep, class Period> 15// bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); 16 17#include <mutex> 18#include <cassert> 19 20bool try_lock_for_called = false; 21 22typedef std::chrono::milliseconds ms; 23 24struct mutex 25{ 26 template <class Rep, class Period> 27 bool try_lock_for(const std::chrono::duration<Rep, Period>& rel_time) 28 { 29 assert(rel_time == ms(5)); 30 try_lock_for_called = !try_lock_for_called; 31 return try_lock_for_called; 32 } 33 void unlock() {} 34}; 35 36mutex m; 37 38int main() 39{ 40 std::unique_lock<mutex> lk(m, std::defer_lock); 41 assert(lk.try_lock_for(ms(5)) == true); 42 assert(try_lock_for_called == true); 43 assert(lk.owns_lock() == true); 44 try 45 { 46 lk.try_lock_for(ms(5)); 47 assert(false); 48 } 49 catch (std::system_error& e) 50 { 51 assert(e.code().value() == EDEADLK); 52 } 53 lk.unlock(); 54 assert(lk.try_lock_for(ms(5)) == false); 55 assert(try_lock_for_called == false); 56 assert(lk.owns_lock() == false); 57 lk.release(); 58 try 59 { 60 lk.try_lock_for(ms(5)); 61 assert(false); 62 } 63 catch (std::system_error& e) 64 { 65 assert(e.code().value() == EPERM); 66 } 67} 68