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 // <condition_variable> 11 12 // class condition_variable; 13 14 // void wait(unique_lock<mutex>& lock); 15 16 #include <condition_variable> 17 #include <mutex> 18 #include <thread> 19 #include <cassert> 20 21 std::condition_variable cv; 22 std::mutex mut; 23 24 int test1 = 0; 25 int test2 = 0; 26 27 void f() 28 { 29 std::unique_lock<std::mutex> lk(mut); 30 assert(test2 == 0); 31 test1 = 1; 32 cv.notify_one(); 33 while (test2 == 0) 34 cv.wait(lk); 35 assert(test2 != 0); 36 } 37 38 int main() 39 { 40 std::unique_lock<std::mutex>lk(mut); 41 std::thread t(f); 42 assert(test1 == 0); 43 while (test1 == 0) 44 cv.wait(lk); 45 assert(test1 != 0); 46 test2 = 1; 47 lk.unlock(); 48 cv.notify_one(); 49 t.join(); 50 } 51
