// Copyright 2023 The Abseil Authors.

//

// 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

//

//      https://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 "absl/synchronization/internal/waiter_base.h"

#include "absl/base/config.h"

#include "absl/base/internal/thread_identity.h"

namespace absl {

ABSL_NAMESPACE_BEGIN

namespace synchronization_internal {

#ifdef ABSL_INTERNAL_NEED_REDUNDANT_CONSTEXPR_DECL

constexpr int WaiterBase::kIdlePeriods;

#endif

void WaiterBase::MaybeBecomeIdle() {

  base_internal::ThreadIdentity *identity =

      base_internal::CurrentThreadIdentityIfPresent();

  assert(identity != nullptr);

  const bool is_idle = identity->is_idle.load(std::memory_order_relaxed);

  const int ticker = identity->ticker.load(std::memory_order_relaxed);

  const int wait_start = identity->wait_start.load(std::memory_order_relaxed);

  if (!is_idle && ticker - wait_start > kIdlePeriods) {

    identity->is_idle.store(true, std::memory_order_relaxed);

  }

}

}  // namespace synchronization_internal

ABSL_NAMESPACE_END

}  // namespace absl