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authorThe Android Open Source Project <initial-contribution@android.com>2009-03-03 18:28:35 -0800
committerThe Android Open Source Project <initial-contribution@android.com>2009-03-03 18:28:35 -0800
commitf721e3ac031f892af46f255a47d7f54a91317b30 (patch)
tree4b825dc642cb6eb9a060e54bf8d69288fbee4904 /android/utils/filelock.h
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-/* Copyright (C) 2007-2008 The Android Open Source Project
-**
-** This software is licensed under the terms of the GNU General Public
-** License version 2, as published by the Free Software Foundation, and
-** may be copied, distributed, and modified under those terms.
-**
-** This program is distributed in the hope that it will be useful,
-** but WITHOUT ANY WARRANTY; without even the implied warranty of
-** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-** GNU General Public License for more details.
-*/
-
-#ifndef _ANDROID_UTILS_FILELOCK_H
-#define _ANDROID_UTILS_FILELOCK_H
-
-/** FILE LOCKS SUPPORT
- **
- ** a FileLock is useful to prevent several emulator instances from using the same
- ** writable file (e.g. the userdata.img disk images).
- **
- ** create a FileLock object with filelock_create(), the function will return
- ** NULL only if the corresponding path is already locked by another emulator
- ** of if the path is read-only.
- **
- ** note that 'path' can designate a non-existing path and that the lock creation
- ** function can detect stale file locks that can longer when the emulator
- ** crashes unexpectedly, and will happily clean them for you.
- **
- ** you can call filelock_release() to release a file lock explicitely. otherwise
- ** all file locks are automatically released when the program exits.
- **/
-
-typedef struct FileLock FileLock;
-
-extern FileLock* filelock_create ( const char* path );
-extern void filelock_release( FileLock* lock );
-
-#endif /* _ANDROID_UTILS_FILELOCK_H */