node/deps/v8/src/counters.cc

// Copyright 2007-2008 the V8 project authors. All rights reserved.
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#include "v8.h"

#include "counters.h"
#include "platform.h"

namespace v8 {
namespace internal {

CounterLookupCallback StatsTable::lookup_function_ = NULL;
CreateHistogramCallback StatsTable::create_histogram_function_ = NULL;
AddHistogramSampleCallback StatsTable::add_histogram_sample_function_ = NULL;

// Start the timer.
void StatsCounterTimer::Start() {
  if (!counter_.Enabled())
    return;
  stop_time_ = 0;
  start_time_ = OS::Ticks();
}

// Stop the timer and record the results.
void StatsCounterTimer::Stop() {
  if (!counter_.Enabled())
    return;
  stop_time_ = OS::Ticks();

  // Compute the delta between start and stop, in milliseconds.
  int milliseconds = static_cast<int>(stop_time_ - start_time_) / 1000;
  counter_.Increment(milliseconds);
}

// Start the timer.
void HistogramTimer::Start() {
  if (GetHistogram() != NULL) {
    stop_time_ = 0;
    start_time_ = OS::Ticks();
  }
}

// Stop the timer and record the results.
void HistogramTimer::Stop() {
  if (histogram_ != NULL) {
    stop_time_ = OS::Ticks();

    // Compute the delta between start and stop, in milliseconds.
    int milliseconds = static_cast<int>(stop_time_ - start_time_) / 1000;
    StatsTable::AddHistogramSample(histogram_, milliseconds);
  }
}

} }  // namespace v8::internal