1 /* 2 * Copyright 2012, 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 BCC_SUPPORT_FILE_MUTEX_H 18 #define BCC_SUPPORT_FILE_MUTEX_H 19 20 #include <string> 21 22 #include "FileBase.h" 23 24 namespace bcc { 25 26 // This class is used to acquire write locks. 27 // TODO(jeanluc) More documentation. 28 class FileMutex : public FileBase { 29 public: 30 explicit FileMutex(const std::string &pFileToLock) 31 : FileBase(pFileToLock + ".lock", O_RDONLY | O_CREAT, kDeleteOnClose) { } 32 33 // Provide a lock() interface filled with default configuration. 34 inline bool lockMutex() { 35 return FileBase::lock(FileBase::kWriteLock, true, FileBase::kDefaultMaxRetryLock, 36 FileBase::kDefaultRetryLockInterval); 37 } 38 }; 39 40 } // namespace bcc 41 42 #endif // BCC_SUPPORT_FILE_MUTEX_H 43
