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| 1 // Copyright 2015 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 #ifndef BASE_FILES_FILE_TRACING_H_ | |
| 6 #define BASE_FILES_FILE_TRACING_H_ | |
| 7 | |
| 8 #include "base/basictypes.h" | |
| 9 #include "base/macros.h" | |
| 10 #include "base/trace_event/trace_event.h" | |
| 11 | |
| 12 #define FILE_TRACING_PREFIX "File" | |
| 13 | |
| 14 #define FILE_TRACING_BEGIN() \ | |
| 15 TRACE_EVENT_NESTABLE_ASYNC_BEGIN0( \ | |
| 16 base::kFileTracingEventCategoryGroup, FILE_TRACING_PREFIX, this) | |
| 17 | |
| 18 #define FILE_TRACING_END() \ | |
| 19 TRACE_EVENT_NESTABLE_ASYNC_END0( \ | |
| 20 base::kFileTracingEventCategoryGroup, FILE_TRACING_PREFIX, this) | |
| 21 | |
| 22 #define SCOPED_FILE_TRACE_WITH_SIZE(name, size) \ | |
| 23 base::ScopedFileTrace scoped_file_trace; \ | |
| 24 do { \ | |
| 25 bool category_enabled; \ | |
| 26 TRACE_EVENT_CATEGORY_GROUP_ENABLED( \ | |
| 27 base::kFileTracingEventCategoryGroup, &category_enabled); \ | |
| 28 if (category_enabled) \ | |
| 29 scoped_file_trace.Initialize( \ | |
| 30 FILE_TRACING_PREFIX "::" name, this, size); \ | |
| 31 } while (0) | |
| 32 | |
| 33 #define SCOPED_FILE_TRACE(name) SCOPED_FILE_TRACE_WITH_SIZE(name, 0) | |
| 34 | |
| 35 namespace base { | |
| 36 | |
| 37 class File; | |
| 38 | |
| 39 extern const char kFileTracingEventCategoryGroup[]; | |
| 40 | |
| 41 class ScopedFileTrace { | |
| 42 public: | |
| 43 ScopedFileTrace(); | |
| 44 ~ScopedFileTrace(); | |
| 45 | |
| 46 // Called only if the tracing category is enabled. | |
| 47 void Initialize(const char* event, File* file, int64 size); | |
| 48 | |
| 49 private: | |
| 50 // True if |Initialize()| has been called. Don't touch |path_|, |event_|, | |
| 51 // or |bytes_| if |initialized_| is false. | |
| 52 bool initialized_; | |
| 53 | |
| 54 // The event name to trace (e.g. "Read", "Write"). Prefixed with "base::File". | |
| 55 const char* name_; | |
| 56 | |
| 57 // The file being traced. Must outlive this class. | |
| 58 File* file_; | |
| 59 | |
| 60 // The size (in bytes) of this trace. Not reported if 0. | |
| 61 int64 size_; | |
| 62 | |
| 63 DISALLOW_COPY_AND_ASSIGN(ScopedFileTrace); | |
| 64 }; | |
| 65 | |
| 66 } // namespace base | |
| 67 | |
| 68 #endif // BASE_FILES_FILE_TRACING_H_ | |
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