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 11 12 // Until we drop support for the synchronization library in C++11/14/17 13 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS 14 15 // XFAIL: availability-synchronization_library-missing 16 17 // <semaphore> 18 19 #include <semaphore> 20 #include <chrono> 21 #include <thread> 22 #include <type_traits> 23 24 #include "make_test_thread.h" 25 #include "test_macros.h" 26 27 static_assert(std::is_same<std::binary_semaphore, std::counting_semaphore<1>>::value, ""); 28 29 int main(int, char**) 30 { 31 std::binary_semaphore s(1); 32 33 auto l = [&](){ 34 for(int i = 0; i < 1024; ++i) { 35 s.acquire(); 36 std::this_thread::sleep_for(std::chrono::microseconds(1)); 37 s.release(); 38 } 39 }; 40 41 std::thread t = support::make_test_thread(l); 42 l(); 43 44 t.join(); 45 46 return 0; 47 } 48