1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // UNSUPPORTED: no-threads 10 11 // <mutex> 12 13 // template <class Mutex> class unique_lock; 14 15 // template <class Rep, class Period> 16 // bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); 17 18 #include <mutex> 19 #include <cassert> 20 21 #include "test_macros.h" 22 23 bool try_lock_for_called = false; 24 25 typedef std::chrono::milliseconds ms; 26 27 struct mutex 28 { 29 template <class Rep, class Period> try_lock_formutex30 bool try_lock_for(const std::chrono::duration<Rep, Period>& rel_time) 31 { 32 assert(rel_time == ms(5)); 33 try_lock_for_called = !try_lock_for_called; 34 return try_lock_for_called; 35 } unlockmutex36 void unlock() {} 37 }; 38 39 mutex m; 40 main(int,char **)41int main(int, char**) 42 { 43 std::unique_lock<mutex> lk(m, std::defer_lock); 44 assert(lk.try_lock_for(ms(5)) == true); 45 assert(try_lock_for_called == true); 46 assert(lk.owns_lock() == true); 47 #ifndef TEST_HAS_NO_EXCEPTIONS 48 try 49 { 50 TEST_IGNORE_NODISCARD lk.try_lock_for(ms(5)); 51 assert(false); 52 } 53 catch (std::system_error& e) 54 { 55 assert(e.code().value() == EDEADLK); 56 } 57 #endif 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 #ifndef TEST_HAS_NO_EXCEPTIONS 64 try 65 { 66 TEST_IGNORE_NODISCARD lk.try_lock_for(ms(5)); 67 assert(false); 68 } 69 catch (std::system_error& e) 70 { 71 assert(e.code().value() == EPERM); 72 } 73 #endif 74 75 return 0; 76 } 77