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// Copyright 2022 gRPC 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
//
// 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.
#ifndef GRPC_SRC_CORE_LIB_GPRPP_PER_CPU_H
#define GRPC_SRC_CORE_LIB_GPRPP_PER_CPU_H
#include <grpc/support/port_platform.h>
#include <algorithm>
#include <cstddef>
#include <limits>
#include <memory>
#include <grpc/support/cpu.h>
#include "src/core/lib/iomgr/exec_ctx.h"
namespace grpc_core {
template <typename T>
class PerCpu {
public:
explicit PerCpu(size_t max = std::numeric_limits<size_t>::max())
: cpus_(std::min<size_t>(max, gpr_cpu_num_cores())),
data_{new T[cpus_]} {}
T& this_cpu() { return data_[ExecCtx::Get()->starting_cpu() % cpus_]; }
T* begin() { return data_.get(); }
T* end() { return data_.get() + cpus_; }
const T* begin() const { return data_.get(); }
const T* end() const { return data_.get() + cpus_; }
private:
const size_t cpus_;
std::unique_ptr<T[]> data_;
};
} // namespace grpc_core
#endif // GRPC_SRC_CORE_LIB_GPRPP_PER_CPU_H
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