libcxx/test/std/thread/thread.jthread/request_stop.pass.cpp

   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: libcpp-has-no-experimental-stop_token
  11 // UNSUPPORTED: c++03, c++11, c++14, c++17
  12 // XFAIL: availability-synchronization_library-missing
  13
  14 // [[nodiscard]] bool request_stop() noexcept;
  15
  16 #include <cassert>
  17 #include <concepts>
  18 #include <stop_token>
  19 #include <thread>
  20 #include <type_traits>
  21
  22 #include "make_test_thread.h"
  23 #include "test_macros.h"
  24
  25 static_assert(noexcept(std::declval<std::jthread&>().request_stop()));
  26
  27 int main(int, char**) {
  28   // Represents a thread
  29   {
  30     std::jthread jt = support::make_test_jthread([] {});
  31     auto st         = jt.get_stop_token();
  32     assert(!st.stop_requested());
  33     std::same_as<bool> decltype(auto) result = jt.request_stop();
  34     assert(result);
  35     assert(st.stop_requested());
  36   }
  37
  38   // Does not represent a thread
  39   {
  40     std::jthread jt{};
  41     std::same_as<bool> decltype(auto) result = jt.request_stop();
  42     assert(!result);
  43   }
  44
  45   return 0;
  46 }