be/src/kudu/util/async_util-test.cc

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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 limitations
// under the License.

#include "kudu/util/async_util.h"

#include <unistd.h>

#include <functional>
#include <thread>
#include <vector>

#include <gtest/gtest.h>

#include "kudu/gutil/basictypes.h"
#include "kudu/gutil/callback.h"
#include "kudu/util/monotime.h"
#include "kudu/util/status.h"
#include "kudu/util/test_macros.h"
#include "kudu/util/test_util.h"

using std::thread;
using std::vector;

namespace kudu {

class AsyncUtilTest : public KuduTest {
 public:
  AsyncUtilTest() {
    // Set up an alarm to fail the test in case of deadlock.
    alarm(30);
  }
  ~AsyncUtilTest() {
    // Disable the alarm on test exit.
    alarm(0);
  }
};

// Test completing the synchronizer through each of the APIs it exposes.
TEST_F(AsyncUtilTest, TestSynchronizerCompletion) {
  Synchronizer sync;

  {
    auto waiter = thread([sync] {
        ignore_result(sync.Wait());
    });
    SleepFor(MonoDelta::FromMilliseconds(5));
    sync.StatusCB(Status::OK());
    waiter.join();
  }
  sync.Reset();
  {
    auto cb = sync.AsStatusCallback();
    auto waiter = thread([sync] {
        ignore_result(sync.Wait());
    });
    SleepFor(MonoDelta::FromMilliseconds(5));
    cb.Run(Status::OK());
    waiter.join();
  }
  sync.Reset();
  {
    auto cb = sync.AsStdStatusCallback();
    auto waiter = thread([sync] {
        ignore_result(sync.Wait());
    });
    SleepFor(MonoDelta::FromMilliseconds(5));
    cb(Status::OK());
    waiter.join();
  }
}

TEST_F(AsyncUtilTest, TestSynchronizerMultiWait) {
  Synchronizer sync;
  vector<thread> waiters;
  for (int i = 0; i < 5; i++) {
    waiters.emplace_back([sync] {
        ignore_result(sync.Wait());
    });
  }
  SleepFor(MonoDelta::FromMilliseconds(5));
  sync.StatusCB(Status::OK());

  for (auto& waiter : waiters) {
    waiter.join();
  }
}

TEST_F(AsyncUtilTest, TestSynchronizerTimedWait) {
  thread waiter;
  {
    Synchronizer sync;
    auto cb = sync.AsStatusCallback();
    waiter = thread([cb] {
        SleepFor(MonoDelta::FromMilliseconds(5));
        cb.Run(Status::OK());
    });
    ASSERT_OK(sync.WaitFor(MonoDelta::FromMilliseconds(1000)));
  }
  waiter.join();

  {
    Synchronizer sync;
    auto cb = sync.AsStatusCallback();
    waiter = thread([cb] {
        SleepFor(MonoDelta::FromMilliseconds(1000));
        cb.Run(Status::OK());
    });
    ASSERT_TRUE(sync.WaitFor(MonoDelta::FromMilliseconds(5)).IsTimedOut());
  }

  // Waiting on the thread gives TSAN to check that no thread safety issues
  // occurred.
  waiter.join();
}
} // namespace kudu