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: libcpp-has-no-threads 10 // UNSUPPORTED: c++03, c++11 11 12 // This test requires the dylib support introduced in D68480, which shipped in macOS 11.0. 13 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}} 14 15 // <semaphore> 16 17 #include <cassert> 18 #include <semaphore> 19 #include <thread> 20 21 #include "make_test_thread.h" 22 #include "test_macros.h" 23 24 int main(int, char**) 25 { 26 std::counting_semaphore<> s(1); 27 28 assert(s.try_acquire()); 29 assert(!s.try_acquire()); 30 s.release(); 31 assert(s.try_acquire()); 32 assert(!s.try_acquire()); 33 s.release(2); 34 std::thread t = support::make_test_thread([&](){ 35 assert(s.try_acquire()); 36 }); 37 t.join(); 38 assert(s.try_acquire()); 39 assert(!s.try_acquire()); 40 41 return 0; 42 } 43