2 // Open Service Platform
3 // Copyright (c) 2013 Samsung Electronics Co., Ltd.
5 // Licensed under the Apache License, Version 2.0 (the License);
6 // you may not use this file except in compliance with the License.
7 // You may obtain a copy of the License at
9 // http://www.apache.org/licenses/LICENSE-2.0
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS,
13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 // See the License for the specific language governing permissions and
15 // limitations under the License.
19 * @brief This is the header file for the %FileLock class.
21 * This header file contains the declarations of the %FileLock class.
24 #ifndef _FIO_FILE_LOCK_H_
25 #define _FIO_FILE_LOCK_H_
27 namespace Tizen { namespace Io
34 * Defines the file lock type
40 FILE_LOCK_SHARED, /**< More than one process can hold a shared file lock on a file region.
41 A shared lock prevents any other process from setting an exclusive lock on the file
43 FILE_LOCK_EXCLUSIVE /**< Only one process can hold an exclusive lock on a file region.
44 An exclusive lock prevents any other process from setting both shared and exclusive
45 lock on the file region. */
48 class _OSP_EXPORT_ FileLock
49 : public Tizen::Base::Object
53 * This destructor releases the file lock on the current opened file if acquired
57 virtual ~FileLock(void);
60 * Checks whether the file lock is shared.
64 * @return @c true if the file lock is shared, @n
67 bool IsShared(void) const;
70 * Checks whether the file lock is exclusive.
74 * @return @c true if the file lock is exclusive, @n
77 bool IsExclusive(void) const;
80 * Checks whether the file lock is valid. @n
81 * The lock is valid unless the associated %File has been closed.
85 * @return @c true if the file lock is valid, @n
88 bool IsValid(void) const;
92 // This default constructor is intentionally declared as private so that only the platform can create an instance.
97 // The implementation of this copy constructor is intentionally blank and declared as private to prohibit copying of objects.
99 FileLock(const FileLock& rhs);
102 // The implementation of this copy assignment operator is intentionally blank and declared as private to prohibit copying of objects.
104 FileLock& operator =(const FileLock& rhs);
107 // Constructs the instance of this class.
111 // @return An error code
112 // @param[in] fileImpl Am instance of _FileImpl
113 // @param[in] lockType The type of file lock to be created
114 // @param[in] offset The starting offset for the locked region
115 // @param[in] size The size of the locked region in bytes
116 // @param[in] pid process id of the proccess aquiring this lock
117 // @exception E_SUCCESS The method is successful.
118 // @exception E_OUT_OF_MEMORY The memory is insufficient.
119 // @exception E_SYSTEM A system error has occurred.
121 result Construct(const _FileImpl* pFileImpl, FileLockType lockType, int offset, int size, int pid);
123 class _FileLockImpl* __pFileLockImpl;
125 friend class _FileLockImpl;
131 #endif // _FIO_FILE_LOCK_H_