base/profiler/alternate_timer.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/profiler/alternate_timer.h"
   6
   7 #include "base/logging.h"
   8
   9 namespace {
  10
  11 tracked_objects::NowFunction* g_time_function = NULL;
  12 tracked_objects::TimeSourceType g_time_source_type =
  13     tracked_objects::TIME_SOURCE_TYPE_WALL_TIME;
  14
  15 }  // anonymous namespace
  16
  17 namespace tracked_objects {
  18
  19 const char kAlternateProfilerTime[] = "CHROME_PROFILER_TIME";
  20
  21 // Set an alternate timer function to replace the OS time function when
  22 // profiling.
  23 void SetAlternateTimeSource(NowFunction* now_function, TimeSourceType type) {
  24   DCHECK_EQ(reinterpret_cast<NowFunction*>(NULL), g_time_function);
  25   g_time_function = now_function;
  26   g_time_source_type = type;
  27 }
  28
  29 NowFunction* GetAlternateTimeSource() {
  30   return g_time_function;
  31 }
  32
  33 TimeSourceType GetTimeSourceType() {
  34   return g_time_source_type;
  35 }
  36
  37 }  // namespace tracked_objects