libcxx/test/std/thread/thread.jthread/get_stop_token.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]] stop_token get_stop_token() const noexcept;
  15
  16 #include <cassert>
  17 #include <concepts>
  18 #include <stop_token>
  19 #include <thread>
  20 #include <type_traits>
  21 #include <utility>
  22
  23 #include "make_test_thread.h"
  24 #include "test_macros.h"
  25
  26 static_assert(noexcept(std::declval<const std::jthread&>().get_stop_token()));
  27
  28 int main(int, char**) {
  29   // Represents a thread
  30   {
  31     std::jthread jt                                 = support::make_test_jthread([] {});
  32     auto ss                                         = jt.get_stop_source();
  33     std::same_as<std::stop_token> decltype(auto) st = std::as_const(jt).get_stop_token();
  34
  35     assert(st.stop_possible());
  36     assert(!st.stop_requested());
  37     ss.request_stop();
  38     assert(st.stop_requested());
  39   }
  40
  41   // Does not represent a thread
  42   {
  43     const std::jthread jt{};
  44     std::same_as<std::stop_token> decltype(auto) st = jt.get_stop_token();
  45
  46     assert(!st.stop_possible());
  47   }
  48
  49   return 0;
  50 }