| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef COMPONENTS_FILESYSTEM_LOCK_TABLE_H_ |
| #define COMPONENTS_FILESYSTEM_LOCK_TABLE_H_ |
| |
| #include <set> |
| |
| #include "base/files/file.h" |
| #include "base/memory/ref_counted.h" |
| |
| namespace filesystem { |
| |
| class FileImpl; |
| |
| // A table of all locks held by this process. We have one global table owned by |
| // the app, but accessible by everything just in case two connections from the |
| // same origin try to lock the same file. |
| class LockTable : public base::RefCounted<LockTable> { |
| public: |
| LockTable(); |
| |
| // Locks a file. |
| base::File::Error LockFile(FileImpl* file); |
| |
| // Releases a lock, if there is one. |
| base::File::Error UnlockFile(FileImpl* file); |
| |
| // Removes a path from the list of |locked_files_|. This can be called on |
| // files that were never locked, as it is called on all file closes and |
| // FileImpl destruction. |
| void RemoveFromLockTable(const base::FilePath& path); |
| |
| private: |
| friend class base::RefCounted<LockTable>; |
| ~LockTable(); |
| |
| // Open, locked files. We keep track of this so we quickly error when we try |
| // to double lock a file. |
| std::set<base::FilePath> locked_files_; |
| |
| DISALLOW_COPY_AND_ASSIGN(LockTable); |
| }; |
| |
| } // namespace filesystem |
| |
| #endif // COMPONENTS_FILESYSTEM_LOCK_TABLE_H_ |