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 // <condition_variable> 13 14 // class condition_variable; 15 16 // void notify_one(); 17 18 #include <condition_variable> 19 #include <mutex> 20 #include <thread> 21 #include <cassert> 22 23 std::condition_variable cv; 24 std::mutex mut; 25 26 int test0 = 0; 27 int test1 = 0; 28 int test2 = 0; 29 30 void f1() 31 { 32 std::unique_lock<std::mutex> lk(mut); 33 assert(test1 == 0); 34 while (test1 == 0) 35 cv.wait(lk); 36 assert(test1 == 1); 37 test1 = 2; 38 } 39 40 void f2() 41 { 42 std::unique_lock<std::mutex> lk(mut); 43 assert(test2 == 0); 44 while (test2 == 0) 45 cv.wait(lk); 46 assert(test2 == 1); 47 test2 = 2; 48 } 49 50 int main() 51 { 52 std::thread t1(f1); 53 std::thread t2(f2); 54 std::this_thread::sleep_for(std::chrono::milliseconds(100)); 55 { 56 std::unique_lock<std::mutex>lk(mut); 57 test1 = 1; 58 test2 = 1; 59 } 60 cv.notify_one(); 61 { 62 std::this_thread::sleep_for(std::chrono::milliseconds(100)); 63 std::unique_lock<std::mutex>lk(mut); 64 } 65 if (test1 == 2) 66 { 67 t1.join(); 68 test1 = 0; 69 } 70 else if (test2 == 2) 71 { 72 t2.join(); 73 test2 = 0; 74 } 75 else 76 assert(false); 77 cv.notify_one(); 78 { 79 std::this_thread::sleep_for(std::chrono::milliseconds(100)); 80 std::unique_lock<std::mutex>lk(mut); 81 } 82 if (test1 == 2) 83 { 84 t1.join(); 85 test1 = 0; 86 } 87 else if (test2 == 2) 88 { 89 t2.join(); 90 test2 = 0; 91 } 92 else 93 assert(false); 94 } 95
