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 // UNSUPPORTED: c++03, c++11, c++14, c++17 11 12 // XFAIL: availability-synchronization_library-missing 13 14 // This is a regression test for https://llvm.org/PR47013. 15 16 // <semaphore> 17 18 #include <barrier> 19 #include <semaphore> 20 #include <thread> 21 #include <vector> 22 23 #include "make_test_thread.h" 24 25 static std::counting_semaphore<> s(0); 26 static std::barrier<> b(8 + 1); 27 acquire()28void acquire() { 29 for (int i = 0; i < 10'000; ++i) { 30 s.acquire(); 31 b.arrive_and_wait(); 32 } 33 } 34 release()35void release() { 36 for (int i = 0; i < 10'000; ++i) { 37 s.release(1); 38 s.release(1); 39 s.release(1); 40 s.release(1); 41 42 s.release(1); 43 s.release(1); 44 s.release(1); 45 s.release(1); 46 47 b.arrive_and_wait(); 48 } 49 } 50 main(int,char **)51int main(int, char**) { 52 for (int run = 0; run < 20; ++run) { 53 std::vector<std::thread> threads; 54 for (int i = 0; i < 8; ++i) 55 threads.push_back(support::make_test_thread(acquire)); 56 57 threads.push_back(support::make_test_thread(release)); 58 59 for (auto& thread : threads) 60 thread.join(); 61 } 62 63 return 0; 64 } 65