1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_SERVERS_CAMERA_TRACES_H_ 18 #define ANDROID_SERVERS_CAMERA_TRACES_H_ 19 20 #include <utils/Errors.h> 21 #include <utils/Vector.h> 22 23 namespace android { 24 namespace camera3 { 25 26 struct CameraTracesImpl; 27 28 // Collect a list of the process's stack traces 29 class CameraTraces { 30 public: 31 /** 32 * Save the current stack trace for each thread in the process. At most 33 * MAX_TRACES will be saved, after which the oldest traces will be discarded. 34 * 35 * <p>Use CameraTraces::dump to print out the traces.</p> 36 */ 37 static void saveTrace(); 38 39 /** 40 * Prints all saved traces to the specified file descriptor. 41 * 42 * <p>Each line is indented by DUMP_INDENT spaces.</p> 43 */ 44 static status_t dump(int fd); 45 46 private: 47 enum { 48 // Don't collect more than 100 traces. Discard oldest. 49 MAX_TRACES = 100, 50 51 // Insert 2 spaces when dumping the traces 52 DUMP_INDENT = 2, 53 }; 54 55 CameraTraces(); 56 ~CameraTraces(); 57 CameraTraces(CameraTraces& rhs); 58 59 static CameraTracesImpl& sImpl; 60 }; // class CameraTraces 61 62 }; // namespace camera3 63 }; // namespace android 64 65 #endif // ANDROID_SERVERS_CAMERA_TRACES_H_ 66