chromium/third_party/abseil-cpp/absl/strings/internal/cordz_handle.h

// Copyright 2019 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.

#ifndef ABSL_STRINGS_INTERNAL_CORDZ_HANDLE_H_
#define ABSL_STRINGS_INTERNAL_CORDZ_HANDLE_H_

#include <atomic>
#include <vector>

#include "absl/base/config.h"
#include "absl/base/internal/raw_logging.h"

namespace absl {
ABSL_NAMESPACE_BEGIN
namespace cord_internal {

// This base class allows multiple types of object (CordzInfo and
// CordzSampleToken) to exist simultaneously on the delete queue (pointed to by
// global_dq_tail and traversed using dq_prev_ and dq_next_). The
// delete queue guarantees that once a profiler creates a CordzSampleToken and
// has gained visibility into a CordzInfo object, that CordzInfo object will not
// be deleted prematurely. This allows the profiler to inspect all CordzInfo
// objects that are alive without needing to hold a global lock.
class ABSL_DLL CordzHandle { … };

class CordzSnapshot : public CordzHandle { … };

}  // namespace cord_internal
ABSL_NAMESPACE_END
}  // namespace absl

#endif  // ABSL_STRINGS_INTERNAL_CORDZ_HANDLE_H_