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// This is a glue file, which allows third party code to call into our profiler 6// without having to include most any functions from base. 7 8#ifndef BASE_PROFILER_ALTERNATE_TIMER_H_ 9#define BASE_PROFILER_ALTERNATE_TIMER_H_ 10 11#include "base/base_export.h" 12 13namespace tracked_objects { 14 15enum TimeSourceType { 16 TIME_SOURCE_TYPE_WALL_TIME, 17 TIME_SOURCE_TYPE_TCMALLOC 18}; 19 20// Provide type for an alternate timer function. 21typedef unsigned int NowFunction(); 22 23// Environment variable name that is used to activate alternate timer profiling 24// (such as using TCMalloc allocations to provide a pseudo-timer) for tasks 25// instead of wall clock profiling. 26BASE_EXPORT extern const char kAlternateProfilerTime[]; 27 28// Set an alternate timer function to replace the OS time function when 29// profiling. Typically this is called by an allocator that is providing a 30// function that indicates how much memory has been allocated on any given 31// thread. 32BASE_EXPORT void SetAlternateTimeSource(NowFunction* now_function, 33 TimeSourceType type); 34 35// Gets the pointer to a function that was set via SetAlternateTimeSource(). 36// Returns NULL if no set was done prior to calling GetAlternateTimeSource. 37NowFunction* GetAlternateTimeSource(); 38 39// Returns the type of the currently set time source. 40BASE_EXPORT TimeSourceType GetTimeSourceType(); 41 42} // namespace tracked_objects 43 44#endif // BASE_PROFILER_ALTERNATE_TIMER_H_ 45