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// void lock(); 15 16#include <mutex> 17#include <thread> 18#include <cstdlib> 19#include <cassert> 20 21std::mutex m; 22 23typedef std::chrono::system_clock Clock; 24typedef Clock::time_point time_point; 25typedef Clock::duration duration; 26typedef std::chrono::milliseconds ms; 27typedef std::chrono::nanoseconds ns; 28 29void f() 30{ 31 std::unique_lock<std::mutex> lk(m, std::defer_lock); 32 time_point t0 = Clock::now(); 33 lk.lock(); 34 time_point t1 = Clock::now(); 35 assert(lk.owns_lock() == true); 36 ns d = t1 - t0 - ms(250); 37 assert(d < ms(25)); // within 25ms 38 try 39 { 40 lk.lock(); 41 assert(false); 42 } 43 catch (std::system_error& e) 44 { 45 assert(e.code().value() == EDEADLK); 46 } 47 lk.unlock(); 48 lk.release(); 49 try 50 { 51 lk.lock(); 52 assert(false); 53 } 54 catch (std::system_error& e) 55 { 56 assert(e.code().value() == EPERM); 57 } 58} 59 60int main() 61{ 62 m.lock(); 63 std::thread t(f); 64 std::this_thread::sleep_for(ms(250)); 65 m.unlock(); 66 t.join(); 67} 68