112 lines
2.5 KiB
C++
112 lines
2.5 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/ThreadLocalStorage.h"
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#include "td/utils/StringBuilder.h"
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#include <array>
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#include <mutex>
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namespace td {
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template <size_t N>
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class ThreadSafeMultiCounter {
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public:
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void add(size_t index, int64 diff) {
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CHECK(index < N);
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tls_.get()[index].fetch_add(diff, std::memory_order_relaxed);
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}
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int64 sum(size_t index) const {
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CHECK(index < N);
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int64 res = 0;
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tls_.for_each([&](auto &value) { res += value[index].load(); });
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return res;
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}
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private:
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ThreadLocalStorage<std::array<std::atomic<int64>, N>> tls_;
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};
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class ThreadSafeCounter {
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public:
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void add(int64 diff) {
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counter_.add(0, diff);
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}
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int64 sum() const {
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return counter_.sum(0);
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}
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private:
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ThreadSafeMultiCounter<1> counter_;
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};
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class NamedThreadSafeCounter {
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static constexpr int N = 128;
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using Counter = ThreadSafeMultiCounter<N>;
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public:
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class CounterRef {
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public:
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CounterRef() = default;
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CounterRef(size_t index, Counter *counter) : index_(index), counter_(counter) {
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}
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void add(int64 diff) {
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counter_->add(index_, diff);
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}
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int64 sum() const {
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return counter_->sum(index_);
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}
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private:
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size_t index_{0};
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Counter *counter_{nullptr};
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};
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CounterRef get_counter(Slice name) {
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std::unique_lock<std::mutex> guard(mutex_);
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for (size_t i = 0; i < names_.size(); i++) {
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if (names_[i] == name) {
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return get_counter_ref(i);
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}
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}
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CHECK(names_.size() < N);
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names_.push_back(name.str());
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return get_counter_ref(names_.size() - 1);
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}
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CounterRef get_counter_ref(size_t index) {
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return CounterRef(index, &counter_);
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}
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static NamedThreadSafeCounter &get_default() {
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static NamedThreadSafeCounter res;
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return res;
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}
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template <class F>
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void for_each(F &&f) const {
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std::unique_lock<std::mutex> guard(mutex_);
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for (size_t i = 0; i < names_.size(); i++) {
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f(names_[i], counter_.sum(i));
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}
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}
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friend StringBuilder &operator<<(StringBuilder &sb, const NamedThreadSafeCounter &counter) {
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counter.for_each([&sb](Slice name, int64 cnt) { sb << name << ": " << cnt << "\n"; });
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return sb;
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}
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private:
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mutable std::mutex mutex_;
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std::vector<std::string> names_;
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Counter counter_;
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};
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} // namespace td
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