74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
/*
|
|
* Copyright (C) 2022 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
#pragma once
|
|
|
|
#include <set>
|
|
#include <string>
|
|
|
|
#include <fruit/fruit.h>
|
|
|
|
#include "host/commands/cvd/lock_file.h"
|
|
|
|
namespace cuttlefish {
|
|
|
|
// This class is not thread safe.
|
|
class InstanceLockFile {
|
|
friend class InstanceLockFileManager;
|
|
using LockFile = cvd_impl::LockFile;
|
|
|
|
public:
|
|
int Instance() const;
|
|
Result<InUseState> Status() const;
|
|
Result<void> Status(InUseState);
|
|
|
|
bool operator<(const InstanceLockFile&) const;
|
|
|
|
private:
|
|
InstanceLockFile(LockFile&& lock_file, const int instance_num);
|
|
LockFile lock_file_;
|
|
const int instance_num_;
|
|
};
|
|
|
|
class InstanceLockFileManager {
|
|
using LockFile = cvd_impl::LockFile;
|
|
using LockFileManager = cvd_impl::LockFileManager;
|
|
|
|
public:
|
|
INJECT(InstanceLockFileManager());
|
|
|
|
Result<InstanceLockFile> AcquireLock(int instance_num);
|
|
Result<std::set<InstanceLockFile>> AcquireLocks(const std::set<int>& nums);
|
|
|
|
Result<std::optional<InstanceLockFile>> TryAcquireLock(int instance_num);
|
|
Result<std::set<InstanceLockFile>> TryAcquireLocks(const std::set<int>& nums);
|
|
|
|
// Best-effort attempt to find a free instance id.
|
|
Result<std::optional<InstanceLockFile>> TryAcquireUnusedLock();
|
|
|
|
Result<std::vector<InstanceLockFile>> LockAllAvailable();
|
|
|
|
private:
|
|
/*
|
|
* Generate value to initialize
|
|
*/
|
|
Result<std::set<int>> FindPotentialInstanceNumsFromNetDevices();
|
|
static Result<std::string> LockFilePath(int instance_num);
|
|
std::optional<std::set<int>> all_instance_nums_;
|
|
LockFileManager lock_file_manager_;
|
|
};
|
|
|
|
} // namespace cuttlefish
|