1 // Copyright 2014 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_DEBUG_TASK_ANNOTATOR_H_ 6 #define BASE_DEBUG_TASK_ANNOTATOR_H_ 7 8 #include <stdint.h> 9 10 #include "base/base_export.h" 11 #include "base/macros.h" 12 13 namespace base { 14 struct PendingTask; 15 namespace debug { 16 17 // Implements common debug annotations for posted tasks. This includes data 18 // such as task origins, queueing durations and memory usage. 19 class BASE_EXPORT TaskAnnotator { 20 public: 21 TaskAnnotator(); 22 ~TaskAnnotator(); 23 24 // Called to indicate that a task has been queued to run in the future. 25 // |queue_function| is used as the trace flow event name. 26 void DidQueueTask(const char* queue_function, 27 const PendingTask& pending_task); 28 29 // Run a previously queued task. |queue_function| should match what was 30 // passed into |DidQueueTask| for this task. 31 void RunTask(const char* queue_function, PendingTask* pending_task); 32 33 private: 34 // Creates a process-wide unique ID to represent this task in trace events. 35 // This will be mangled with a Process ID hash to reduce the likelyhood of 36 // colliding with TaskAnnotator pointers on other processes. 37 uint64_t GetTaskTraceID(const PendingTask& task) const; 38 39 DISALLOW_COPY_AND_ASSIGN(TaskAnnotator); 40 }; 41 42 } // namespace debug 43 } // namespace base 44 45 #endif // BASE_DEBUG_TASK_ANNOTATOR_H_ 46
