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 23std::condition_variable cv; 24std::mutex mut; 25 26int test1 = 0; 27int test2 = 0; 28 29void 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 40int 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