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#pragma clang system_header
// 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.
#pragma once
#include <any>
#include <functional>
#include <memory>
#include <utility>
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/util/visibility.h"
namespace arrow20 {
namespace internal {
struct ARROW_EXPORT AtForkHandler {
using CallbackBefore = std::function<std::any()>;
using CallbackAfter = std::function<void(std::any)>;
// The before-fork callback can return an arbitrary token (wrapped in std::any)
// that will passed as-is to after-fork callbacks. This can ensure that any
// resource necessary for after-fork handling is kept alive.
CallbackBefore before;
CallbackAfter parent_after;
CallbackAfter child_after;
AtForkHandler() = default;
explicit AtForkHandler(CallbackAfter child_after)
: child_after(std::move(child_after)) {}
AtForkHandler(CallbackBefore before, CallbackAfter parent_after,
CallbackAfter child_after)
: before(std::move(before)),
parent_after(std::move(parent_after)),
child_after(std::move(child_after)) {}
};
// Register the given at-fork handlers. Their intended lifetime should be tracked by
// calling code using an owning shared_ptr.
ARROW_EXPORT
void RegisterAtFork(std::weak_ptr<AtForkHandler>);
} // namespace internal
} // namespace arrow20
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