michael@0: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: // This is a glue file, which allows third party code to call into our profiler
michael@0: // without having to include most any functions from base.
michael@0: 
michael@0: #ifndef BASE_PROFILER_ALTERNATE_TIMER_H_
michael@0: #define BASE_PROFILER_ALTERNATE_TIMER_H_
michael@0: 
michael@0: #include "base/base_export.h"
michael@0: 
michael@0: namespace tracked_objects {
michael@0: 
michael@0: enum TimeSourceType {
michael@0:   TIME_SOURCE_TYPE_WALL_TIME,
michael@0:   TIME_SOURCE_TYPE_TCMALLOC
michael@0: };
michael@0: 
michael@0: // Provide type for an alternate timer function.
michael@0: typedef unsigned int NowFunction();
michael@0: 
michael@0: // Environment variable name that is used to activate alternate timer profiling
michael@0: // (such as using TCMalloc allocations to provide a pseudo-timer) for tasks
michael@0: // instead of wall clock profiling.
michael@0: BASE_EXPORT extern const char kAlternateProfilerTime[];
michael@0: 
michael@0: // Set an alternate timer function to replace the OS time function when
michael@0: // profiling.  Typically this is called by an allocator that is providing a
michael@0: // function that indicates how much memory has been allocated on any given
michael@0: // thread.
michael@0: BASE_EXPORT void SetAlternateTimeSource(NowFunction* now_function,
michael@0:                                         TimeSourceType type);
michael@0: 
michael@0: // Gets the pointer to a function that was set via SetAlternateTimeSource().
michael@0: // Returns NULL if no set was done prior to calling GetAlternateTimeSource.
michael@0: NowFunction* GetAlternateTimeSource();
michael@0: 
michael@0: // Returns the type of the currently set time source.
michael@0: BASE_EXPORT TimeSourceType GetTimeSourceType();
michael@0: 
michael@0: }  // namespace tracked_objects
michael@0: 
michael@0: #endif  // BASE_PROFILER_ALTERNATE_TIMER_H_