blob: 14a76cbf3e32fbdffe1ee5f4e6a964826fceff61 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
#ifndef _sys_LockFile_h
#define _sys_LockFile_h
/*
*
* Copyright (c) 2008 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <boost/noncopyable.hpp>
#include <boost/shared_ptr.hpp>
#include <string>
#include "qpid/CommonImportExport.h"
#include "qpid/sys/IntegerTypes.h"
namespace qpid {
namespace sys {
class LockFilePrivate;
/**
* @class LockFile
*
* LockFile represents a locked file suitable for a coarse-grain system
* lock. For example, the broker uses this to ensure that only one broker
* runs. A common usage idiom is to store the current "owner" process ID
* in the lock file - if the lock file exists, but the stored process ID
* doesn't, the old owner has probably died without cleaning up the lock
* file.
*/
class LockFile : private boost::noncopyable
{
std::string path;
bool created;
boost::shared_ptr<LockFilePrivate> impl;
protected:
int read(void*, size_t) const;
int write(void*, size_t) const;
public:
QPID_COMMON_EXTERN LockFile(const std::string& path_, bool create);
QPID_COMMON_EXTERN ~LockFile();
};
}} /* namespace qpid::sys */
#endif /*!_sys_LockFile_h*/
|
