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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // UNSUPPORTED: libcpp-has-no-threads 10 11 // <condition_variable> 12 13 // class condition_variable; 14 15 // template <class Predicate> 16 // void wait(unique_lock<mutex>& lock, Predicate pred); 17 18 #include <condition_variable> 19 #include <mutex> 20 #include <thread> 21 #include <functional> 22 #include <cassert> 23 24 #include "make_test_thread.h" 25 #include "test_macros.h" 26 27 std::condition_variable cv; 28 std::mutex mut; 29 30 int test1 = 0; 31 int test2 = 0; 32 33 class Pred 34 { 35 int& i_; 36 public: Pred(int & i)37 explicit Pred(int& i) : i_(i) {} 38 operator ()()39 bool operator()() {return i_ != 0;} 40 }; 41 f()42void f() 43 { 44 std::unique_lock<std::mutex> lk(mut); 45 assert(test2 == 0); 46 test1 = 1; 47 cv.notify_one(); 48 cv.wait(lk, Pred(test2)); 49 assert(test2 != 0); 50 } 51 main(int,char **)52int main(int, char**) 53 { 54 std::unique_lock<std::mutex>lk(mut); 55 std::thread t = support::make_test_thread(f); 56 assert(test1 == 0); 57 while (test1 == 0) 58 cv.wait(lk); 59 assert(test1 != 0); 60 test2 = 1; 61 lk.unlock(); 62 cv.notify_one(); 63 t.join(); 64 65 return 0; 66 } 67