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_any; 14 15 // void notify_all(); 16 17 #include <condition_variable> 18 #include <mutex> 19 #include <thread> 20 #include <vector> 21 #include <atomic> 22 #include <cassert> 23 24 #include "make_test_thread.h" 25 #include "test_macros.h" 26 27 std::condition_variable_any cv; 28 29 typedef std::timed_mutex L0; 30 typedef std::unique_lock<L0> L1; 31 32 L0 m0; 33 34 const unsigned threadCount = 2; 35 bool pleaseExit = false; 36 std::atomic<unsigned> notReady; 37 helper()38void helper() { 39 L1 lk(m0); 40 --notReady; 41 while (pleaseExit == false) 42 cv.wait(lk); 43 } 44 main(int,char **)45int main(int, char**) 46 { 47 notReady = threadCount; 48 std::vector<std::thread> threads(threadCount); 49 for (unsigned i = 0; i < threadCount; i++) 50 threads[i] = support::make_test_thread(helper); 51 { 52 while (notReady > 0) 53 std::this_thread::yield(); 54 // At this point, both threads have had a chance to acquire the lock and are 55 // either waiting on the condition variable or about to wait. 56 L1 lk(m0); 57 pleaseExit = true; 58 // POSIX does not guarantee reliable scheduling if notify_all is called 59 // without the lock being held. 60 cv.notify_all(); 61 } 62 // The test will hang if not all of the threads were woken. 63 for (unsigned i = 0; i < threadCount; i++) 64 threads[i].join(); 65 66 return 0; 67 } 68