50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
//
|
|
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
//
|
|
#pragma once
|
|
|
|
#include "td/utils/common.h"
|
|
#include "td/utils/port/thread_local.h"
|
|
|
|
#include <array>
|
|
#include <atomic>
|
|
|
|
namespace td {
|
|
|
|
class ThreadSafeCounter {
|
|
public:
|
|
void add(int64 diff) {
|
|
auto &node = thread_local_node();
|
|
node.count_.store(node.count_.load(std::memory_order_relaxed) + diff, std::memory_order_relaxed);
|
|
}
|
|
|
|
int64 sum() const {
|
|
int n = max_thread_id_.load();
|
|
int64 res = 0;
|
|
for (int i = 0; i < n; i++) {
|
|
res += nodes_[i].count_.load();
|
|
}
|
|
return res;
|
|
}
|
|
|
|
private:
|
|
struct Node {
|
|
std::atomic<int64> count_{0};
|
|
char padding[128];
|
|
};
|
|
static constexpr int MAX_THREAD_ID = 128;
|
|
std::atomic<int> max_thread_id_{MAX_THREAD_ID};
|
|
std::array<Node, MAX_THREAD_ID> nodes_;
|
|
|
|
Node &thread_local_node() {
|
|
auto thread_id = get_thread_id();
|
|
CHECK(static_cast<size_t>(thread_id) < nodes_.size());
|
|
return nodes_[thread_id];
|
|
}
|
|
};
|
|
|
|
} // namespace td
|