57 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8//9// UNSUPPORTED: no-threads10 11// <condition_variable>12 13// class condition_variable;14 15// void wait(unique_lock<mutex>& lock);16 17#include <condition_variable>18#include <mutex>19#include <thread>20#include <cassert>21 22#include "make_test_thread.h"23#include "test_macros.h"24 25std::condition_variable cv;26std::mutex mut;27 28int test1 = 0;29int test2 = 0;30 31void f()32{33 std::unique_lock<std::mutex> lk(mut);34 assert(test2 == 0);35 test1 = 1;36 cv.notify_one();37 while (test2 == 0)38 cv.wait(lk);39 assert(test2 != 0);40}41 42int main(int, char**)43{44 std::unique_lock<std::mutex> lk(mut);45 std::thread t = support::make_test_thread(f);46 assert(test1 == 0);47 while (test1 == 0)48 cv.wait(lk);49 assert(test1 != 0);50 test2 = 1;51 lk.unlock();52 cv.notify_one();53 t.join();54 55 return 0;56}57