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: no-threads 10 11 // <condition_variable> 12 13 // class condition_variable; 14 15 // void notify_all(); 16 17 #include <atomic> 18 #include <condition_variable> 19 #include <mutex> 20 #include <thread> 21 #include <cassert> 22 23 #include "make_test_thread.h" 24 #include "test_macros.h" 25 26 std::condition_variable cv; 27 std::mutex mut; 28 29 int test0 = 0; 30 int test1 = 0; 31 int test2 = 0; 32 33 std::atomic<int> ready_count(0); 34 35 void f1() 36 { 37 std::unique_lock<std::mutex> lk(mut); 38 assert(test1 == 0); 39 ready_count += 1; 40 while (test1 == 0) 41 cv.wait(lk); 42 assert(test1 == 1); 43 test1 = 2; 44 } 45 46 void f2() 47 { 48 std::unique_lock<std::mutex> lk(mut); 49 assert(test2 == 0); 50 ready_count += 1; 51 while (test2 == 0) 52 cv.wait(lk); 53 assert(test2 == 1); 54 test2 = 2; 55 } 56 57 int main(int, char**) 58 { 59 std::thread t1 = support::make_test_thread(f1); 60 std::thread t2 = support::make_test_thread(f2); 61 while (ready_count.load() != 2) { 62 std::this_thread::sleep_for(std::chrono::milliseconds(100)); 63 } 64 { 65 std::unique_lock<std::mutex>lk(mut); 66 test1 = 1; 67 test2 = 1; 68 } 69 cv.notify_all(); 70 { 71 std::this_thread::sleep_for(std::chrono::milliseconds(100)); 72 std::unique_lock<std::mutex>lk(mut); 73 } 74 t1.join(); 75 t2.join(); 76 assert(test1 == 2); 77 assert(test2 == 2); 78 79 return 0; 80 } 81