folly/folly/docs/examples/folly/experimental/coro/WithCancellation.cpp

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
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#include <chrono>
#include <thread>

#include <folly/CancellationToken.h>
#include <folly/experimental/coro/GtestHelpers.h>
#include <folly/experimental/coro/Sleep.h>
#include <folly/experimental/coro/Task.h>
#include <folly/experimental/coro/Timeout.h>
#include <folly/experimental/coro/WithCancellation.h>
#include <folly/portability/GTest.h>

using namespace std::literals::chrono_literals;

CO_TEST(CodeExamples, demoTimeoutAndWithCancellationCancel) {
  folly::CancellationSource cs;
  std::thread job([&cs] {
    // NOLINTNEXTLINE(facebook-hte-BadCall-sleep_for)
    std::this_thread::sleep_for(500ms);
    cs.requestCancellation();
  });

  CO_ASSERT_THROW(
      co_await folly::coro::co_withCancellation(
          cs.getToken(), folly::coro::sleep(1s)),
      folly::OperationCancelled);
  job.join();
}