YugabyteDB (2.13.0.0-b42, bfc6a6643e7399ac8a0e81d06a3ee6d6571b33ab)

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// regarding copyright ownership.  The ASF licenses this file

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// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

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// specific language governing permissions and limitations

// under the License.

//

// The following only applies to changes made to this file as part of YugaByte development.

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// Portions Copyright (c) YugaByte, Inc.

//

// 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 limitations

// under the License.

//

#include <vector>

#include <gtest/gtest.h>

#include "yb/util/once.h"

#include "yb/util/test_macros.h"

#include "yb/util/thread.h"

using std::vector;

using strings::Substitute;

namespace yb {

namespace {

struct Thing {

  explicit Thing(bool should_fail)

    : should_fail_(should_fail),

      value_(0) {

  }

  Status Init() {

    return once_.Init(&Thing::InitOnce, this);

  }

  Status InitOnce() {

    if (should_fail_) {

      return STATUS(IllegalState, "Whoops!");

    }

    value_ = 1;

    return Status::OK();

  }

  const bool should_fail_;

  int value_;

  YBOnceDynamic once_;

};

} // anonymous namespace

TEST(TestOnce, YBOnceDynamicTest) {

  {

    Thing t(false);

    ASSERT_EQ(0, t.value_);

    ASSERT_FALSE(t.once_.initted());

    for (int i = 0; i < 2; i++) {

      ASSERT_OK(t.Init());

      ASSERT_EQ(1, t.value_);

      ASSERT_TRUE(t.once_.initted());

    }

  }

  {

    Thing t(true);

    for (int i = 0; i < 2; i++) {

      ASSERT_TRUE(t.Init().IsIllegalState());

      ASSERT_EQ(0, t.value_);

      ASSERT_TRUE(t.once_.initted());

    }

  }

}

static void InitOrGetInitted(Thing* t, int i) {

  if (i % 2 == 0) {

    LOG(INFO) << "Thread " << i << " initting";

    ASSERT_OK(t->Init());

  } else {

    LOG(INFO) << "Thread " << i << " value: " << t->once_.initted();

  }

}

TEST(TestOnce, YBOnceDynamicThreadSafeTest) {

  Thing thing(false);

  // The threads will read and write to thing.once_.initted. If access to

  // it is not synchronized, TSAN will flag the access as data races.

  vector<scoped_refptr<Thread> > threads;

  for (int i = 0; i < 10; i++) {

    scoped_refptr<Thread> t;

    ASSERT_OK(Thread::Create("test", Substitute("thread $0", i),

                             &InitOrGetInitted, &thing, i, &t));

    threads.push_back(t);

  }

  for (const scoped_refptr<Thread>& t : threads) {

    t->Join();

  }

}

} // namespace yb