GuardPageAllocator.h

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/*
 * Copyright 2015-present Facebook, 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.
 */
#pragma once

#include <memory>

namespace folly {
namespace fibers {

class StackCacheEntry;

class GuardPageAllocator {
 public:
  explicit GuardPageAllocator(bool useGuardPages);
  ~GuardPageAllocator();

  unsigned char* allocate(size_t size);

  void deallocate(unsigned char* limit, size_t size);

 private:
  std::unique_ptr<StackCacheEntry> stackCache_;
  std::allocator<unsigned char> fallbackAllocator_;
  bool useGuardPages_{true};
};
} // namespace fibers
} // namespace folly