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 namespace OHOS { 28 namespace HiviewDFX { 29 30 #define BACK_TRACE_RING_BUFFER_SIZE (32 * 1024) 31 32 typedef int (*RingBufferWriteFunc) (int32_t fd, const char *buf, const int len); 33 34 class DfxRingBufferWrapper final { 35 public: 36 static DfxRingBufferWrapper &GetInstance(); 37 ~DfxRingBufferWrapper() = default; 38 39 void StartThread(); 40 void StopThread(); 41 42 void SetWriteBufFd(int32_t fd); 43 void SetWriteFunc(RingBufferWriteFunc func); 44 45 void AppendMsg(const std::string& msg); 46 int AppendBuf(const char *format, ...); 47 private: 48 static void LoopPrintRingBuffer(); 49 static int DefaultWrite(int32_t fd, const char *buf, const int len); 50 51 DfxRingBufferWrapper() = default; 52 DISALLOW_COPY_AND_MOVE(DfxRingBufferWrapper); 53 54 RingBufferWriteFunc writeFunc_ = nullptr; 55 56 DfxRingBuffer<BACK_TRACE_RING_BUFFER_SIZE, std::string> ringBuffer_; 57 int32_t fd_ = -1; 58 volatile bool hasFinished_ = false; 59 60 static std::condition_variable printCV_; 61 static std::mutex printMutex_; 62 }; 63 } // namespace HiviewDFX 64 } // namespace OHOS 65 66 #endif // DFX_PROCESSDUMP_H 67