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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_NAMED_SYSTEM_LOCK_LOCK_H_
#define COMPONENTS_NAMED_SYSTEM_LOCK_LOCK_H_
#include <memory>
#include <string>
#include "build/build_config.h"
#if BUILDFLAG(IS_WIN)
#include <windows.h>
#include "base/win/atl.h"
#endif
namespace base {
class TimeDelta;
} // namespace base
namespace named_system_lock {
class ScopedLockImpl;
// ScopedLock represents a held lock. Destroying the ScopedLock releases the
// lock. ScopedLock is reentrant on Windows, but not on Mac or Linux.
class ScopedLock {
public:
explicit ScopedLock(std::unique_ptr<ScopedLockImpl> impl);
ScopedLock(const ScopedLock&) = delete;
ScopedLock& operator=(const ScopedLock&) = delete;
~ScopedLock();
// Returns a ScopedLock, or nullptr if the lock could not be acquired within
// the timeout. While the ScopedLock exists, no other process on the machine
// may acquire that lock. The lock name has different meanings per platform:
// Linux: A shared memory object name starting with `/`. E.g. `/MyApp.lock`.
// Mac: A bootstrap service name (see `man bootstrap_check_in`).
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_MAC)
static std::unique_ptr<ScopedLock> Create(const std::string& name,
base::TimeDelta timeout);
#elif BUILDFLAG(IS_WIN)
static std::unique_ptr<ScopedLock> Create(const std::wstring& mutex_name,
CSecurityAttributes* sa,
base::TimeDelta timeout);
#endif
private:
std::unique_ptr<ScopedLockImpl> impl_;
};
} // namespace named_system_lock
#endif // COMPONENTS_NAMED_SYSTEM_LOCK_LOCK_H_
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