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 // <semaphore> 15 16 #include <semaphore> 17 #include <thread> 18 19 #include "make_test_thread.h" 20 #include "test_macros.h" 21 22 int main(int, char**) 23 { 24 std::counting_semaphore<> s(0); 25 26 s.release(); 27 s.acquire(); 28 29 std::thread t = support::make_test_thread([&](){ 30 s.acquire(); 31 }); 32 s.release(2); 33 t.join(); 34 s.acquire(); 35 36 return 0; 37 } 38