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Side by Side Diff: base/profiler/alternate_timer.h

Issue 1647803004: Move base to DEPS (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 4 years, 10 months ago
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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
13 namespace tracked_objects {
14
15 enum TimeSourceType {
16 TIME_SOURCE_TYPE_WALL_TIME,
17 TIME_SOURCE_TYPE_TCMALLOC
18 };
19
20 // Provide type for an alternate timer function.
21 typedef 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.
26 BASE_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.
32 BASE_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.
37 NowFunction* GetAlternateTimeSource();
38
39 // Returns the type of the currently set time source.
40 BASE_EXPORT TimeSourceType GetTimeSourceType();
41
42 } // namespace tracked_objects
43
44 #endif // BASE_PROFILER_ALTERNATE_TIMER_H_
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