72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
// Copyright 2021 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_UPDATE_SCOPE_H_
|
|
#define ABSL_STRINGS_INTERNAL_CORDZ_UPDATE_SCOPE_H_
|
|
|
|
#include "absl/base/config.h"
|
|
#include "absl/base/optimization.h"
|
|
#include "absl/base/thread_annotations.h"
|
|
#include "absl/strings/internal/cord_internal.h"
|
|
#include "absl/strings/internal/cordz_info.h"
|
|
#include "absl/strings/internal/cordz_update_tracker.h"
|
|
|
|
namespace absl {
|
|
ABSL_NAMESPACE_BEGIN
|
|
namespace cord_internal {
|
|
|
|
// CordzUpdateScope scopes an update to the provided CordzInfo.
|
|
// The class invokes `info->Lock(method)` and `info->Unlock()` to guard
|
|
// cordrep updates. This class does nothing if `info` is null.
|
|
// See also the 'Lock`, `Unlock` and `SetCordRep` methods in `CordzInfo`.
|
|
class ABSL_SCOPED_LOCKABLE CordzUpdateScope {
|
|
public:
|
|
CordzUpdateScope(CordzInfo* info, CordzUpdateTracker::MethodIdentifier method)
|
|
ABSL_EXCLUSIVE_LOCK_FUNCTION(info)
|
|
: info_(info) {
|
|
if (ABSL_PREDICT_FALSE(info_)) {
|
|
info->Lock(method);
|
|
}
|
|
}
|
|
|
|
// CordzUpdateScope can not be copied or assigned to.
|
|
CordzUpdateScope(CordzUpdateScope&& rhs) = delete;
|
|
CordzUpdateScope(const CordzUpdateScope&) = delete;
|
|
CordzUpdateScope& operator=(CordzUpdateScope&& rhs) = delete;
|
|
CordzUpdateScope& operator=(const CordzUpdateScope&) = delete;
|
|
|
|
~CordzUpdateScope() ABSL_UNLOCK_FUNCTION() {
|
|
if (ABSL_PREDICT_FALSE(info_)) {
|
|
info_->Unlock();
|
|
}
|
|
}
|
|
|
|
void SetCordRep(CordRep* rep) const {
|
|
if (ABSL_PREDICT_FALSE(info_)) {
|
|
info_->SetCordRep(rep);
|
|
}
|
|
}
|
|
|
|
CordzInfo* info() const { return info_; }
|
|
|
|
private:
|
|
CordzInfo* info_;
|
|
};
|
|
|
|
} // namespace cord_internal
|
|
ABSL_NAMESPACE_END
|
|
} // namespace absl
|
|
|
|
#endif // ABSL_STRINGS_INTERNAL_CORDZ_UPDATE_SCOPE_H_
|