llvm/compiler-rt/lib/scudo/standalone/stats.h

//===-- stats.h -------------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef SCUDO_STATS_H_
#define SCUDO_STATS_H_

#include "atomic_helpers.h"
#include "list.h"
#include "mutex.h"
#include "thread_annotations.h"

#include <string.h>

namespace scudo {

// Memory allocator statistics
enum StatType { … };

StatCounters;

// Per-thread stats, live in per-thread cache. We use atomics so that the
// numbers themselves are consistent. But we don't use atomic_{add|sub} or a
// lock, because those are expensive operations , and we only care for the stats
// to be "somewhat" correct: eg. if we call GlobalStats::get while a thread is
// LocalStats::add'ing, this is OK, we will still get a meaningful number.
class LocalStats { … };

// Global stats, used for aggregation and querying.
class GlobalStats : public LocalStats { … };

} // namespace scudo

#endif // SCUDO_STATS_H_