rocksdb/monitoring/iostats_context_imp.h

//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under the BSD-style license found in the
//  LICENSE file in the root directory of this source tree. An additional grant
//  of patent rights can be found in the PATENTS file in the same directory.
//  This source code is also licensed under the GPLv2 license found in the
//  COPYING file in the root directory of this source tree.
//
#pragma once
#include "monitoring/perf_step_timer.h"
#include "rocksdb/iostats_context.h"

#ifdef ROCKSDB_SUPPORT_THREAD_LOCAL

// increment a specific counter by the specified value
#define IOSTATS_ADD(metric, value)     \
  (get_iostats_context()->metric += value)

// Increase metric value only when it is positive
#define IOSTATS_ADD_IF_POSITIVE(metric, value)   \
  if (value > 0) { IOSTATS_ADD(metric, value); }

// reset a specific counter to zero
#define IOSTATS_RESET(metric)          \
  (get_iostats_context()->metric = 0)

// reset all counters to zero
#define IOSTATS_RESET_ALL()                        \
  (get_iostats_context()->Reset())

#define IOSTATS_SET_THREAD_POOL_ID(value)      \
  (get_iostats_context()->thread_pool_id = value)

#define IOSTATS_THREAD_POOL_ID()               \
  (get_iostats_context()->thread_pool_id)

#define IOSTATS(metric)                        \
  (get_iostats_context()->metric)

// Declare and set start time of the timer
#define IOSTATS_TIMER_GUARD(metric)                                          \
  PerfStepTimer iostats_step_timer_##metric(&(get_iostats_context()->metric)); \
  iostats_step_timer_##metric.Start();

#else  // ROCKSDB_SUPPORT_THREAD_LOCAL

#define IOSTATS_ADD(metric, value)
#define IOSTATS_ADD_IF_POSITIVE(metric, value)
#define IOSTATS_RESET(metric)
#define IOSTATS_RESET_ALL()
#define IOSTATS_SET_THREAD_POOL_ID(value)
#define IOSTATS_THREAD_POOL_ID()
#define IOSTATS(metric) 0

#define IOSTATS_TIMER_GUARD(metric)

#endif  // ROCKSDB_SUPPORT_THREAD_LOCAL