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 "bcc/Support/FileBase.h"
23 
24 namespace bcc {
25 
26 template<enum FileBase::LockModeEnum LockMode>
27 class FileMutex : public FileBase {
28 public:
29   FileMutex(const std::string &pFileToLock)
30     : FileBase(pFileToLock + ".lock", O_RDONLY | O_CREAT, kDeleteOnClose) { }
31 
32   // Provide a lock() interface filled with default configuration.
33   inline bool lock(bool pNonblocking = true,
34                    unsigned pMaxRetry = FileBase::kDefaultMaxRetryLock,
35                    useconds_t pRetryInterval =
36                        FileBase::kDefaultRetryLockInterval) {
37     return FileBase::lock(LockMode, pNonblocking, pMaxRetry, pRetryInterval);
38   }
39 };
40 
41 } // namespace bcc
42 
43 #endif  // BCC_SUPPORT_FILE_MUTEX_H
44