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