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 // XFAIL: libcpp-no-exceptions 11 // UNSUPPORTED: libcpp-has-no-threads 12 // UNSUPPORTED: c++98, c++03, c++11 13 14 // <shared_mutex> 15 16 // template <class Mutex> class shared_lock; 17 18 // void lock(); 19 20 #include <shared_mutex> 21 #include <thread> 22 #include <vector> 23 #include <cstdlib> 24 #include <cassert> 25 26 #include "test_macros.h" 27 28 std::shared_timed_mutex m; 29 30 typedef std::chrono::system_clock Clock; 31 typedef Clock::time_point time_point; 32 typedef Clock::duration duration; 33 typedef std::chrono::milliseconds ms; 34 typedef std::chrono::nanoseconds ns; 35 36 ms WaitTime = ms(250); 37 38 // Thread sanitizer causes more overhead and will sometimes cause this test 39 // to fail. To prevent this we give Thread sanitizer more time to complete the 40 // test. 41 #if !defined(TEST_HAS_SANITIZERS) 42 ms Tolerance = ms(25); 43 #else 44 ms Tolerance = ms(25 * 5); 45 #endif 46 47 48 void f() 49 { 50 std::shared_lock<std::shared_timed_mutex> lk(m, std::defer_lock); 51 time_point t0 = Clock::now(); 52 lk.lock(); 53 time_point t1 = Clock::now(); 54 assert(lk.owns_lock() == true); 55 ns d = t1 - t0 - WaitTime; 56 assert(d < Tolerance); // within tolerance 57 try 58 { 59 lk.lock(); 60 assert(false); 61 } 62 catch (std::system_error& e) 63 { 64 assert(e.code().value() == EDEADLK); 65 } 66 lk.unlock(); 67 lk.release(); 68 try 69 { 70 lk.lock(); 71 assert(false); 72 } 73 catch (std::system_error& e) 74 { 75 assert(e.code().value() == EPERM); 76 } 77 } 78 79 int main() 80 { 81 m.lock(); 82 std::vector<std::thread> v; 83 for (int i = 0; i < 5; ++i) 84 v.push_back(std::thread(f)); 85 std::this_thread::sleep_for(WaitTime); 86 m.unlock(); 87 for (auto& t : v) 88 t.join(); 89 } 90
