iostats_context_imp.h

//  Copyright (c) 2014, 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.
//
#pragma once
#include "rocksdb/iostats_context.h"
#include "util/perf_step_timer.h"

#ifndef IOS_CROSS_COMPILE

// increment a specific counter by the specified value
#define IOSTATS_ADD(metric, value)     \
  (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)          \
  (iostats_context.metric = 0)

// reset all counters to zero
#define IOSTATS_RESET_ALL()                        \
  (iostats_context.Reset())

#define IOSTATS_SET_THREAD_POOL_ID(value)      \
  (iostats_context.thread_pool_id = value)

#define IOSTATS_THREAD_POOL_ID()               \
  (iostats_context.thread_pool_id)

#define IOSTATS(metric)                        \
  (iostats_context.metric)

// Stop the timer and update the metric
#define IOSTATS_TIMER_STOP(metric)          \
  iostats_step_timer_ ## metric.Stop();

#define IOSTATS_TIMER_START(metric)          \
  iostats_step_timer_ ## metric.Start();

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

#else  // IOS_CROSS_COMPILE

#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)
#define IOSTATS_TIMER_STOP(metric)
#define IOSTATS_TIMER_START(metric)

#endif  // IOS_CROSS_COMPILE