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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // FieldTrial is a class for handling details of statistical experiments | 5 // FieldTrial is a class for handling details of statistical experiments |
6 // performed by actual users in the field (i.e., in a shipped or beta product). | 6 // performed by actual users in the field (i.e., in a shipped or beta product). |
7 // All code is called exclusively on the UI thread currently. | 7 // All code is called exclusively on the UI thread currently. |
8 // | 8 // |
9 // The simplest example is an experiment to see whether one of two options | 9 // The simplest example is an experiment to see whether one of two options |
10 // produces "better" results across our user population. In that scenario, UMA | 10 // produces "better" results across our user population. In that scenario, UMA |
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586 FRIEND_TEST_ALL_PREFIXES(FieldTrialListTest, AssociateFieldTrialParams); | 586 FRIEND_TEST_ALL_PREFIXES(FieldTrialListTest, AssociateFieldTrialParams); |
587 FRIEND_TEST_ALL_PREFIXES(FieldTrialListTest, ClearParamsFromSharedMemory); | 587 FRIEND_TEST_ALL_PREFIXES(FieldTrialListTest, ClearParamsFromSharedMemory); |
588 | 588 |
589 #if defined(OS_WIN) | 589 #if defined(OS_WIN) |
590 // Takes in |handle_switch| from the command line which represents the shared | 590 // Takes in |handle_switch| from the command line which represents the shared |
591 // memory handle for field trials, parses it, and creates the field trials. | 591 // memory handle for field trials, parses it, and creates the field trials. |
592 // Returns true on success, false on failure. | 592 // Returns true on success, false on failure. |
593 static bool CreateTrialsFromHandleSwitch(const std::string& handle_switch); | 593 static bool CreateTrialsFromHandleSwitch(const std::string& handle_switch); |
594 #endif | 594 #endif |
595 | 595 |
596 #if defined(OS_POSIX) && !defined(OS_NACL) && !defined(OS_MACOSX) && \ | 596 #if defined(OS_POSIX) && !defined(OS_NACL) && !defined(OS_ANDROID) |
597 !defined(OS_ANDROID) | |
598 // On POSIX systems that use the zygote, we look up the correct fd that backs | 597 // On POSIX systems that use the zygote, we look up the correct fd that backs |
599 // the shared memory segment containing the field trials by looking it up via | 598 // the shared memory segment containing the field trials by looking it up via |
600 // an fd key in GlobalDescriptors. Returns true on success, false on failure. | 599 // an fd key in GlobalDescriptors. Returns true on success, false on failure. |
601 static bool CreateTrialsFromDescriptor(int fd_key); | 600 static bool CreateTrialsFromDescriptor(int fd_key); |
602 #endif | 601 #endif |
603 | 602 |
604 // Takes an unmapped SharedMemoryHandle, creates a SharedMemory object from it | 603 // Takes an unmapped SharedMemoryHandle, creates a SharedMemory object from it |
605 // and maps it with the correct size. | 604 // and maps it with the correct size. |
606 static bool CreateTrialsFromSharedMemoryHandle(SharedMemoryHandle shm_handle); | 605 static bool CreateTrialsFromSharedMemoryHandle(SharedMemoryHandle shm_handle); |
607 | 606 |
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675 | 674 |
676 // Tracks whether CreateTrialsFromCommandLine() has been called. | 675 // Tracks whether CreateTrialsFromCommandLine() has been called. |
677 bool create_trials_from_command_line_called_ = false; | 676 bool create_trials_from_command_line_called_ = false; |
678 | 677 |
679 DISALLOW_COPY_AND_ASSIGN(FieldTrialList); | 678 DISALLOW_COPY_AND_ASSIGN(FieldTrialList); |
680 }; | 679 }; |
681 | 680 |
682 } // namespace base | 681 } // namespace base |
683 | 682 |
684 #endif // BASE_METRICS_FIELD_TRIAL_H_ | 683 #endif // BASE_METRICS_FIELD_TRIAL_H_ |
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