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// explicit shared_lock(mutex_type& m); 17 18#include <shared_mutex> 19#include <thread> 20#include <vector> 21#include <cstdlib> 22#include <cassert> 23 24#if _LIBCPP_STD_VER > 11 25 26std::shared_timed_mutex m; 27 28typedef std::chrono::system_clock Clock; 29typedef Clock::time_point time_point; 30typedef Clock::duration duration; 31typedef std::chrono::milliseconds ms; 32typedef std::chrono::nanoseconds ns; 33 34void f() 35{ 36 time_point t0 = Clock::now(); 37 time_point t1; 38 { 39 std::shared_lock<std::shared_timed_mutex> ul(m); 40 t1 = Clock::now(); 41 } 42 ns d = t1 - t0 - ms(250); 43 assert(d < ms(50)); // within 50ms 44} 45 46void g() 47{ 48 time_point t0 = Clock::now(); 49 time_point t1; 50 { 51 std::shared_lock<std::shared_timed_mutex> ul(m); 52 t1 = Clock::now(); 53 } 54 ns d = t1 - t0; 55 assert(d < ms(50)); // within 50ms 56} 57 58#endif // _LIBCPP_STD_VER > 11 59 60int main() 61{ 62#if _LIBCPP_STD_VER > 11 63 m.lock(); 64 std::vector<std::thread> v; 65 for (int i = 0; i < 5; ++i) 66 v.push_back(std::thread(f)); 67 std::this_thread::sleep_for(ms(250)); 68 m.unlock(); 69 for (auto& t : v) 70 t.join(); 71 m.lock_shared(); 72 for (auto& t : v) 73 t = std::thread(g); 74 std::thread q(f); 75 std::this_thread::sleep_for(ms(250)); 76 m.unlock_shared(); 77 for (auto& t : v) 78 t.join(); 79 q.join(); 80#endif // _LIBCPP_STD_VER > 11 81} 82