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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.
#include "components/filesystem/lock_table.h"
#include "components/filesystem/file_impl.h"
namespace filesystem {
LockTable::LockTable() {}
LockTable::~LockTable() {}
base::File::Error LockTable::LockFile(FileImpl* file) {
DCHECK(file->IsValid());
DCHECK(file->path().IsAbsolute());
auto it = locked_files_.find(file->path());
if (it != locked_files_.end()) {
// We're already locked; that's an error condition on Windows.
return base::File::FILE_ERROR_FAILED;
}
base::File::Error lock_err = file->RawLockFile();
if (lock_err != base::File::FILE_OK) {
// Locking failed for some reason.
return lock_err;
}
locked_files_.insert(file->path());
return base::File::FILE_OK;
}
base::File::Error LockTable::UnlockFile(FileImpl* file) {
auto it = locked_files_.find(file->path());
if (it != locked_files_.end()) {
base::File::Error lock_err = file->RawUnlockFile();
if (lock_err != base::File::FILE_OK) {
// TODO(erg): When can we fail to release a lock?
NOTREACHED();
return lock_err;
}
locked_files_.erase(it);
}
return base::File::FILE_OK;
}
void LockTable::RemoveFromLockTable(const base::FilePath& path) {
auto it = locked_files_.find(path);
if (it != locked_files_.end())
locked_files_.erase(it);
}
} // namespace filesystem
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