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 <cassert> 17 #include <semaphore> 18 #include <thread> 19 20 #include "make_test_thread.h" 21 #include "test_macros.h" 22 23 int main(int, char**) 24 { 25 std::counting_semaphore<> s(1); 26 27 assert(s.try_acquire()); 28 assert(!s.try_acquire()); 29 s.release(); 30 assert(s.try_acquire()); 31 assert(!s.try_acquire()); 32 s.release(2); 33 std::thread t = support::make_test_thread([&](){ 34 assert(s.try_acquire()); 35 }); 36 t.join(); 37 assert(s.try_acquire()); 38 assert(!s.try_acquire()); 39 40 return 0; 41 } 42