The Tor Browser / file revision

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.

 // Use of this source code is governed by a BSD-style license that can be

 // found in the LICENSE file.

 // This is a glue file, which allows third party code to call into our profiler

 // without having to include most any functions from base.

 #ifndef BASE_PROFILER_ALTERNATE_TIMER_H_

 #define BASE_PROFILER_ALTERNATE_TIMER_H_

 #include "base/base_export.h"

 namespace tracked_objects {

 enum TimeSourceType {

   TIME_SOURCE_TYPE_WALL_TIME,

   TIME_SOURCE_TYPE_TCMALLOC

 };

 // Provide type for an alternate timer function.

 typedef unsigned int NowFunction();

 // Environment variable name that is used to activate alternate timer profiling

 // (such as using TCMalloc allocations to provide a pseudo-timer) for tasks

 // instead of wall clock profiling.

 BASE_EXPORT extern const char kAlternateProfilerTime[];

 // Set an alternate timer function to replace the OS time function when

 // profiling.  Typically this is called by an allocator that is providing a

 // function that indicates how much memory has been allocated on any given

 // thread.

 BASE_EXPORT void SetAlternateTimeSource(NowFunction* now_function,

                                         TimeSourceType type);

 // Gets the pointer to a function that was set via SetAlternateTimeSource().

 // Returns NULL if no set was done prior to calling GetAlternateTimeSource.

 NowFunction* GetAlternateTimeSource();

 // Returns the type of the currently set time source.

 BASE_EXPORT TimeSourceType GetTimeSourceType();

 }  // namespace tracked_objects

 #endif  // BASE_PROFILER_ALTERNATE_TIMER_H_