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// 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_
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