1 /* 2 * Copyright (c) 2021-2023 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef DFX_RING_BUFFER_WRAPPER_H 17 #define DFX_RING_BUFFER_WRAPPER_H 18 19 #include <cinttypes> 20 #include <condition_variable> 21 #include <memory> 22 #include <mutex> 23 #include <string> 24 #include "dfx_ring_buffer.h" 25 #include "nocopyable.h" 26 27 typedef int (*RingBufferWriteFunc) (int32_t fd, const char *buf, const int len); 28 29 namespace OHOS { 30 namespace HiviewDFX { 31 namespace { 32 const int BACK_TRACE_RING_BUFFER_SIZE = 32 * 1024; 33 const int BACK_TRACE_RING_BUFFER_PRINT_WAIT_TIME_MS = 10; 34 } 35 36 class DfxRingBufferWrapper final { 37 public: 38 static DfxRingBufferWrapper &GetInstance(); 39 ~DfxRingBufferWrapper() = default; 40 41 void StartThread(); 42 void StopThread(); 43 44 void SetWriteBufFd(int32_t fd); 45 void SetWriteFunc(RingBufferWriteFunc func); 46 47 void AppendMsg(const std::string& msg); 48 int AppendBuf(const char *format, ...); 49 private: 50 static void LoopPrintRingBuffer(); 51 static int DefaultWrite(int32_t fd, const char *buf, const int len); 52 53 DfxRingBufferWrapper() = default; 54 DISALLOW_COPY_AND_MOVE(DfxRingBufferWrapper); 55 56 RingBufferWriteFunc writeFunc_ = nullptr; 57 58 DfxRingBuffer<BACK_TRACE_RING_BUFFER_SIZE, std::string> ringBuffer_; 59 int32_t fd_ = -1; 60 volatile bool hasFinished_ = false; 61 62 static std::condition_variable printCV_; 63 static std::mutex printMutex_; 64 }; 65 } // namespace HiviewDFX 66 } // namespace OHOS 67 68 #endif // DFX_PROCESSDUMP_H 69