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 wait(unique_lock<mutex>& lock); 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 test1 = 0; 27 int test2 = 0; 28 29 void f() 30 { 31 std::unique_lock<std::mutex> lk(mut); 32 assert(test2 == 0); 33 test1 = 1; 34 cv.notify_one(); 35 while (test2 == 0) 36 cv.wait(lk); 37 assert(test2 != 0); 38 } 39 40 int main() 41 { 42 std::unique_lock<std::mutex>lk(mut); 43 std::thread t(f); 44 assert(test1 == 0); 45 while (test1 == 0) 46 cv.wait(lk); 47 assert(test1 != 0); 48 test2 = 1; 49 lk.unlock(); 50 cv.notify_one(); 51 t.join(); 52 } 53
